JP2006247995A - Mold, molding machine and manufacturing method of optical compopnent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold capable of manufacturing a molded product enhanced in shape precision, a molding machine and a manufacturing method of an optical component. <P>SOLUTION: The mold 11 has a pair of molds 111 and 112 having molding surfaces 111A1 and 112A1 respectively formed thereto and the body mold 113 which surrounds a pair of the molds 111 and 112. The whole outer peripheral surface 113A of the body mold 113 is black and black plating or oxidation treatment is applied to the outer peripheral surface 113A of the body mold 113. Since the outer peripheral surface 113A of the body mold 113 is irradiated with infrared rays and has a black color, infrared rays can be efficiently absorbed by the outer peripheral surface 113A of the body mold 113. By this constitution, the material M arranged in the body mold 113 is certainly heated and, when the material M is pressed, it can be deformed into a desired shape and the optical component having high shape precision can be manufactured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mold, a molding apparatus, and an optical component manufacturing method.

Conventionally, when manufacturing an optical lens (optical component) mounted on an optical apparatus such as a digital camera or a video, a so-called press molding method is employed.
This press molding method is a method in which a material for an optical component, for example, a glass material is placed between a pair of molds, and the material is heated and pressed by a pair of molds (for example, see Patent Document 1). .
Such a press molding method is very widely used because it is simpler and more suitable for mass production than the method of manufacturing an optical component by cutting / grinding the material of the optical component.

JP 2002-68758 A (pages 3 to 6, FIG. 1)

However, when an optical component obtained by the press molding method described above is inspected, the shape of the optical component may be significantly deviated from the design value, and the shape accuracy may be poor.
In recent years, the quality of optical devices such as digital cameras and videos has been improved, and high shape accuracy is required for optical components. Therefore, it is strongly desired to improve the deterioration of the shape accuracy of such optical components. It is rare.

  The objective of this invention is providing the manufacturing method of the shaping | molding die which can manufacture a molded article with high shape precision, a shaping | molding apparatus, and an optical component.

As a result of extensive research by the present inventors, when the mold is heated, the material disposed between the mold and the pair of molds is not sufficiently heated, and press molding is performed. It was found that even when a predetermined pressure is applied to the material, it is difficult to deform the material into a desired shape, which causes a deterioration in shape accuracy.
The present invention has been devised based on such knowledge.

  The molding die of the present invention includes a pair of molds installed so that molding surfaces face each other, and a molding die for pressing the material disposed between the molding surfaces of the pair of molds by bringing the pair of molds close to each other Then, when pressing the material disposed between the molding surfaces of a pair of molds, the predetermined region of the infrared irradiated surface that is heated by irradiation with infrared rays and irradiated with the infrared rays is black. Features.

Here, the region to be black may be a partial region of the infrared irradiated surface or the entire surface of the infrared irradiated surface. The size of the black region may be determined according to the moldability of the material, the infrared irradiation intensity, and the like.
According to the present invention as described above, since the predetermined region of the infrared irradiated surface on which the infrared rays of the mold are irradiated is black, the mold efficiently absorbs the infrared rays. Thereby, the temperature of a shaping | molding die rises and the material inside a shaping | molding die can be heated reliably. Therefore, when a pair of molds are brought close to each other and a material disposed between the molding surfaces of the pair of molds is pressed, the material can be deformed into a desired shape, and a molded product with high shape accuracy can be manufactured. Can do.

Here, as a method of making a predetermined region black, for example, there are the following two methods.
(1) Method of performing oxidation treatment in advance on the predetermined region (2) Method of performing black plating on the predetermined region In both methods (1) and (2), a predetermined region of the infrared irradiated surface is It can be surely black.
Further, when the predetermined region is made black by the method (1) or (2), discoloration of the predetermined region due to heat during press molding can be prevented.

Furthermore, in the present invention, it is preferable to form an uneven shape in the predetermined region.
By forming the concavo-convex shape in the predetermined region, the surface area of the predetermined region is increased, and the area irradiated with infrared rays is increased. Thereby, a shaping | molding die will absorb infrared rays with a large area, and the material inside a shaping | molding die can be heated still more reliably. Therefore, the material can be deformed into a desired shape, and a molded product with high shape accuracy can be manufactured.

In the present invention, the surface roughness Ra of the predetermined region may be Ra ≧ 100 nm.
By setting Ra ≧ 100 nm in the predetermined region, the surface area of the predetermined region is increased and the area irradiated with infrared rays is increased. Thereby, a shaping | molding die will absorb infrared rays with a large area, and the material inside a shaping | molding die will be heated more reliably. Therefore, the material can be deformed into a desired shape, and a molded product with high shape accuracy can be manufactured.

The mold according to the present invention is not limited to the predetermined region black as described above, and includes a pair of molds installed so that the molding surfaces face each other. A mold for pressing a material disposed between the molding surfaces of the mold, and when the material disposed between the molding surfaces of a pair of molds is pressed, the material is heated by irradiation with infrared rays, and the infrared rays are irradiated. An uneven shape may be formed in a predetermined region of the infrared irradiated surface.
According to the present invention, by forming an uneven shape in a predetermined region, the surface area of the predetermined region increases and the area irradiated with infrared rays increases. Thereby, a shaping | molding die can be reliably warmed with infrared rays, and the material inside a shaping | molding die will be heated reliably. Therefore, the material can be deformed into a desired shape, and a molded product with high shape accuracy can be manufactured.

Furthermore, the molding die of the present invention is not limited to the predetermined region black as described above, and includes a pair of dies installed so that the molding surfaces face each other, and the pair of dies are brought close to each other. A mold for pressing a material disposed between the molding surfaces of a pair of molds, wherein the material disposed between the molding surfaces of the pair of molds is heated by irradiation with infrared rays, The surface roughness of a predetermined region of the infrared irradiated surface on which is irradiated may be Ra ≧ 100 nm.
According to the present invention, by setting the surface roughness of the predetermined region to Ra ≧ 100 nm, the surface area of the predetermined region is increased, and the area irradiated with infrared rays is increased. Thereby, a shaping | molding die can be reliably warmed with infrared rays, and the material inside a shaping | molding die will be heated reliably. Therefore, the material can be deformed into a desired shape, and a molded product with high shape accuracy can be manufactured.

At this time, in addition to setting the surface roughness of the predetermined region to Ra ≧ 100 nm, an uneven shape may be formed in the predetermined region.
By forming the concavo-convex shape in the predetermined region, the surface area of the predetermined region is further increased, and the area irradiated with infrared rays is increased. Thereby, a shaping | molding die will be heated more reliably by infrared rays, and the material inside a shaping | molding die will be heated more reliably. Therefore, the material can be deformed into a desired shape, and a molded product with high shape accuracy can be manufactured.

In the invention as described above, the mold has a cylindrical body mold that surrounds the pair of molds and guides the sliding of the mold, and the predetermined region is an outer peripheral surface of the body mold. It is preferable.
According to such a molding die of the present invention, since it has a configuration including a cylindrical body die, a pair of dies can be arranged to face each other at a predetermined position, and a molded product having a desired shape can be easily obtained. Can be manufactured.

The molding apparatus of the present invention includes any one of the above-described molding dies, a pressing unit for pressing a material disposed between the molding surfaces of the pair of molds by bringing the pair of molds close to each other, The press comprises: a pair of press plates disposed between a pair of molds and the press means, and sandwiching the pair of molds; and an irradiation means for irradiating the mold with infrared rays. The outer peripheral surface of the plate is black.
By making the outer peripheral surface of the press plate black, the press plate also absorbs infrared rays and is heated. Since a pair of molds are sandwiched between the heated press plates, heat is transferred from the press plates to the molds, and the press plates keep the molds warm and prevent a decrease in the temperature of the molds. It becomes possible to do.

The method of manufacturing an optical component according to the present invention uses a mold having a pair of molds arranged so that molding surfaces face each other, irradiates the mold with infrared rays, and brings the pair of molds close to each other. A method of manufacturing an optical component that presses a material disposed between molding surfaces of a pair of molds, wherein a black treatment is performed in which a predetermined region of an infrared irradiated surface to which the infrared rays are irradiated is black. A material disposed between a pair of molds by placing a material between the pair of molds and then heating the mold by irradiating infrared rays with an infrared ray and bringing the pair of molds close to each other And a pressurizing step for pressing.
According to the present invention, since the predetermined area of the infrared irradiated surface of the mold that is irradiated with infrared rays is black, in the heating process in which the mold is irradiated with infrared rays and heated, the mold radiates infrared rays. It will absorb efficiently. Thereby, the heat | fever of a shaping | molding die rises and the material inside a shaping | molding die will be heated reliably. Therefore, in the pressurizing step of pressing the material disposed between the molding surfaces of the pair of molds, the material can be deformed into a desired shape, and a molded product with high shape accuracy can be manufactured.

[1. First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
(1-1) Configuration of Molding Device FIG. 1 shows a molding device 1 according to this embodiment. The molding apparatus 1 is an apparatus for molding an optical component (molded product) mounted on an optical device such as a digital camera or a video.
The molding apparatus 1 includes a plurality of molds 11, a press unit 12 for driving the plurality of molds 11 to press the material disposed inside the mold 11, and the press unit 12 and the mold 11. A pair of press plates 13, a cylindrical chamber 14, a pair of pipes 15 for discharging a fluid such as air in the chamber 14, and a heating means 17.

A plurality of, for example, six molds 11 are arranged between the pair of press plates 13 as shown in FIG.
The mold 11 is made of, for example, a high-strength, high-heat-resistant material such as cemented carbide, carbon nitride, or silicon carbide. As shown in FIG. 3, the pair of molds 111 and 112 and the pair of molds 111 , 112 to surround the body mold 113.
Of the pair of molds 111 and 112, the mold 111 located in the upper part of FIG. 3 includes a columnar mold body 111A and a disk-shaped flange portion 111B attached to one circular surface of the mold body 111A.
The diameter of the flange portion 111B is larger than the diameter of the cylindrical mold body 111A, and the outer peripheral edge of the flange portion 111B protrudes outward from the mold body 111A.
The other circular surface of the mold main body 111A is formed in a recessed manner, forming a molding surface 111A1. In the present embodiment, the molding surface 111A1 has an aspheric shape.

The mold 112 has substantially the same configuration as the mold 111, and includes a cylindrical mold body 112A and a disk-shaped flange portion 112B attached to one circular surface of the mold body 112A.
The diameter of the flange portion 112B is larger than the diameter of the cylindrical mold body 112A, and the outer peripheral edge of the flange portion 112B protrudes outward from the mold body 112A.
The other circular surface of the mold main body 112A is formed in a recessed manner, forming a molding surface 112A1. In the present embodiment, the molding surface 112A1 has a spherical shape.

Such a pair of molds 111 and 112 are installed so that the molding surfaces 111A1 and 112A1 face each other, and the optical component L (see FIG. 4E) is formed in a space formed by the opposing molding surfaces 111A1 and 112A1. ) Material M is inserted.
The trunk mold 113 is a cylindrical member installed so as to surround the mold bodies 111A and 112A of the pair of molds 111 and 112. The body mold 113 aligns the axes of the molds 111 and 112 and guides the sliding of the mold 111. The inner diameter of the body mold 113 is larger than the mold main bodies 111A and 112A and smaller than the flange portions 111B and 112B.

The body mold 113 is placed on the flange portion 112B of the mold body 112A. When the mold 112 approaches the mold 111 and presses the material M, the flange section 111B of the mold 111 is placed on the body mold 113. It will be in contact with the end face.
The outer peripheral surface 113A of the body mold 113 is an infrared irradiated surface irradiated with infrared rays from the heating means 17 described later, and the entire surface is black. Although the method of making it black is arbitrary, it is good also as black by giving an oxidation process previously, for example, and good also as black by giving black plating. When colored by such oxidation treatment or black plating, discoloration of the outer peripheral surface 113A of the body mold 113 due to heat during press molding can be prevented.

Again, as shown in FIG. 1, the pressing means 12 includes a fixed shaft 121, a movable shaft 122 disposed to face the fixed shaft 121, and a driving device 123 that drives the movable shaft 122.
The fixed shaft 121 is located in the upper part of FIG. 1 and extends toward the movable shaft 122. The fixed shaft 121 is cylindrical and has a hollow inside. Further, a heat insulating cylinder 18 is disposed between the lower end of the fixed shaft 121 and the mold 11. The heat insulating cylinder 18 and the fixed shaft 121 communicate with each other, and the gas inserted into the fixed shaft 121 is introduced into the heat insulating cylinder 18 and discharged from the heat insulating cylinder 18 into the chamber 14 described later.

The movable shaft 122 is located in the lower part of FIG. 1 and extends toward the fixed shaft 121. The movable shaft 122 has a cylindrical shape and is hollow. Further, a heat insulating cylinder 18 is disposed between the upper end of the movable shaft 122 and the mold 11. The heat insulating cylinder 18 and the movable shaft 122 communicate with each other, and the gas inserted into the movable shaft 122 is introduced into the heat insulating cylinder 18 and discharged from the heat insulating cylinder 18 into the chamber 14 described later.
A driving device 123 is provided at the lower end of the movable shaft 122, and the movable shaft 122 is driven in the vertical direction (arrow Y direction) in FIG. The driving device 123 includes a servo motor (not shown) and has a function of converting the rotational motion of the servo motor into a linear motion.

The press plate 13 is disposed between the heat insulating cylinder 18 and the mold 11 described above. One press plate 13 (13 </ b> A) disposed between the heat insulating cylinder 18 and the mold 11 has a substantially circular planar shape, and is large enough to install a plurality of molds 11. Further, the other press plate 13 (13B) has the same size and shape as the one press plate 13 (13A), and is sized so that the plurality of molds 11 can be pressed at a time.
The press plate 13 (13A, 13B) has a cylindrical shape, and the outer peripheral surface (cylindrical surface) 131 is colored black.

The chamber 14 has a cylindrical shape with a flange, and is provided so as to surround the forming die 11, the press plate 13, and the heat insulating cylinder 18. An inert gas such as nitrogen gas is introduced into the chamber 14 via the movable shaft 122, the fixed shaft 121, and the heat insulating cylinder 18. Further, the air in the chamber 14 is exhausted through the pipes 15 provided above and below the chamber 14, respectively.
Such a chamber 14 needs to be made of a material that allows infrared rays from the heating means 17 to pass through, for example, quartz.

  The heating means 17 is disposed outside the chamber 14 and has a plurality of infrared lamps 171 that emit infrared rays. The infrared rays irradiated from the heating means 17 are irradiated to the mold 11, the press plate 13, and the heat insulating cylinder 18.

(1-2) Method for Manufacturing Optical Component Next, a method for manufacturing the optical component L using the molding apparatus 1 as described above will be described with reference to FIGS. 1, 3, 4, and 5. FIG.
FIG. 4 is a schematic diagram showing a manufacturing process of the optical component L. In the present embodiment, a plurality of, for example, six molding dies 11 are placed on the press plate 13 (13A) to obtain a plurality of, for example, six optical components L at one time. Only one mold 11 is shown.
FIG. 5 shows the relationship between the pressure applied to the mold 11, the temperature of the mold 11, and time.

First, the outer peripheral surface 113A of the body mold 113 of the plurality of molds 11 and the outer peripheral surface 131 of the press plate 13 are blackened (black processing step).
Although the method of making it black is arbitrary, it is good also as black by giving an oxidation process previously, for example, and good also as black by giving black plating.
When the oxidation treatment is performed, the body die 113 and the press plate 13 of the mold 11 are placed in an oxygen atmosphere, and heat treatment is performed at a high temperature.
When black plating is applied, black nickel plating, nickel-tin alloy plating, black chrome plating, or the like may be performed.

Next, as shown in FIG. 3A, a glass material M that is a material of the optical component L is disposed between the pair of molds 111 and 112 of each mold 11. This glass material M is formed in a predetermined shape in advance.
Thereafter, a plurality of molds 11 each having a glass material M installed thereon are arranged on the press plate 13 (13A) of the molding apparatus 1.
Then, the air in the chamber 14 is sucked through the pipe 15 to perform evacuation, and the heating means 17 is driven (heating process).
At this time, a part of the mold body 111A of the mold 111 of each mold 11 protrudes upward from the body mold 113 (see FIGS. 3 and 4B).

When the material M inside the mold 11 becomes equal to or higher than the glass transition point Tg (for example, 450 ° C. to 700 ° C.) by the heating unit 17 and the temperature is stabilized and the predetermined time has elapsed, the driving device 123 is driven. Then, the movable shaft 122 moves toward the fixed shaft 121 as the driving device 123 is driven. Thereby, the press plate 13 (13A) on the movable shaft 122 side approaches the press plate 13 (13B) on the fixed shaft 121 side, and each mold 11 is sandwiched between the pair of press plates 13.
Then, one mold 112 of the mold 11 moves toward the other mold 111, and the material M inside the mold 11 is pressed with a predetermined pressure and press-molded (FIG. 4C, FIG. 5 and primary pressurizing step).
The press pressure of the material M (pressure applied to the mold 11) depends on the type of the material M, the shape of the optical component L, and the like, but is, for example, 20 kN to 300 kN.

Next, after pressurizing the material M for a predetermined time, the driving device 123 is driven, and the movable shaft 122 is retracted to the opposite side to the fixed shaft 121 to loosen the pressure once (see FIG. 5). Furthermore, heating by the heating means 17 is stopped, and nitrogen is introduced into the chamber 14 through the fixed shaft 121, the movable shaft 122, and the heat insulating cylinder 18, and the molding die 11 in the chamber 14 and the material M inside the molding die 11 are introduced. Cool gradually. The cooling rate depends on the type of the material M, the shape of the optical component L, and the like, but is 10 ° C./min to 50 ° C./min.
In addition, the time until the heating means 17 starts heating the mold 11 and stops the heating is, for example, 30 seconds to 10 minutes.

When the temperature of the mold 11 and the material M inside the mold 11 starts to decrease, the driving device 123 is driven again, the movable shaft 122 is advanced to the fixed shaft 121 side, and the material M is pressurized (FIG. 4D). ), FIG. 5, secondary pressurizing step).
The press pressure of the material M (pressure applied to the mold 11) in the secondary pressurization step may be equal to the press pressure of the material M (pressure applied to the mold 11) in the primary pressurization step. It may be lower than the pressing pressure of the material M in the pressing step.
Thus, when the material M is pressurized during cooling, the shape change of the material M accompanying cooling can be prevented, and the optical component L with high shape accuracy can be obtained.

Thereafter, when the temperature of the mold 11 and the material M inside the mold 11 decreases and reaches a predetermined temperature, for example, the glass transition point Tg or less, the driving device 123 is driven and the movable shaft 122 is opposite to the fixed shaft 121. Then, the pressure is released again, and more nitrogen is introduced into the chamber 14 for rapid cooling (rapid cooling process).
The cooling rate depends on the type of the material M, the shape of the optical component L, and the like, but is 10 ° C./min to 50 ° C./min.
In addition, it is preferable that the cooling rate in a rapid cooling process is quicker than the cooling rate in a secondary pressurization process.
Thereafter, when the temperature of the mold 11 and the optical component L inside the mold 11 is sufficiently lowered, the pair of molds 111 and 112 are separated from each other, and the optical component L is taken out between the pair of molds 111 and 112 (FIG. 4 ( E)).
Thereby, the optical component L can be obtained.

(1-3) Effects of Embodiment Therefore, according to this embodiment, the following effects can be obtained.
(1-3-1) Since the outer peripheral surface 113A of the body mold 113 of the mold 11 is black, the body mold 113 of the mold 11 absorbs infrared rays efficiently. Inside the barrel mold 113, mold bodies 111A and 112A of a pair of molds 111 and 112 are arranged, and the material M of the optical component L is placed between the mold bodies 111A and 112A. With the rise, the material M is reliably heated. Therefore, when pressing the material M arranged between the molding surfaces 111A1 and 112A1 of the pair of molds 111 and 112 by bringing the pair of molds 111 and 112 close to each other, the material M can be deformed into a desired shape. The optical component L with high shape accuracy can be manufactured.

(1-3-2) The forming die 11 is arranged so as to surround the die main bodies 111A and 112A of the pair of molds 111 and 112, and includes the body die 113. These optical axes L can be arranged opposite to each other at a predetermined position, and an optical component L having a desired shape can be easily manufactured.
(1-3-3) In this embodiment, when the outer peripheral surface 131 of the press plate 13 is black, the press plate 13 also absorbs infrared rays from the heating means 17 and is heated. Since the heated press plate 13 holds the pair of molds 111 and 112 of the mold 11, heat is transmitted from the press plate 13 to the mold 11 and the press plate 13 keeps the mold 11 warm. Thus, it is possible to prevent the temperature of the mold 11 from decreasing.

(1-3-4) When the mold 11 is heated, a part of the mold body 111A of the mold 111 protrudes upward from the body mold 113, so that the outer peripheral surface of the mold body 111A is also black. Although it may be colored, in this case, it takes time and effort to color the mold body 111A.
In the present embodiment, since only the outer peripheral surface 113A of the body mold 113 is black, it is possible to minimize the labor involved in manufacturing the mold 11.
(1-3-5) Furthermore, in this embodiment, a plurality of molding dies 11 are installed on the press plate 13, and the plurality of molding dies 11 are pressed at a time. Thereby, the several optical component L can be obtained simultaneously, and production efficiency can be improved.

[2. Second embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the above embodiment, the outer peripheral surface 113A of the body mold 113 of the molding die 11 is black. However, in this embodiment, the outer peripheral surface 213A of the body mold 213 of the molding die 21 is not black and the outer peripheral surface 213A of the body mold 213 is. The difference is that the surface is uneven. In other respects, it is the same as the mold of the embodiment.

(2-1) Configuration of Molding Mold The molding mold 21 of this embodiment includes a body mold 213 and a pair of molds 111 and 112 similar to those of the above-described embodiment.
As shown in FIG. 6A, concave portions 213A1 having a substantially arc-shaped cross section are formed at equal intervals on the outer peripheral surface 213A of the trunk mold 213, and both ends of the concave portions 213A1 are convex portions 213A2.
In the present embodiment, three recesses 213A1 having a shape along the circumferential direction of the trunk mold 213 are formed on the outer peripheral surface 213A of the trunk mold 213.
Note that the recess 213A1 is not limited to a substantially arc shape in cross section, and may have a rectangular cross section as shown in FIG.

(2-2) Manufacturing Method of Optical Component A manufacturing method of the optical component L using the molding die 21 having the barrel die 213 as described above will be described.
First, a body mold in which the recess 213A1 is not formed is prepared, and the recess 213A1 is cut along the circumferential direction on the outer peripheral surface of the body mold.
Next, as in the above embodiment, the outer peripheral surface of the press plate 13 is made black.
Since the subsequent manufacturing steps are the same as those in the above embodiment, the optical component can be omitted by using the above described mold 21 instead of the mold 11 in the molding apparatus 1 of the above embodiment. L can be manufactured.

(2-3) Effects of Embodiment Therefore, according to this embodiment, the same effects as (1-3-2), (1-3-3), and (1-3-5) of the above embodiment are obtained. In addition to the following effects, the following effects can be achieved.
(2-3-1) By forming an uneven shape on the outer peripheral surface 213A of the trunk mold 213, the surface area of the outer peripheral surface 213A of the trunk mold 213 increases, and the area irradiated with infrared rays increases. Thereby, the trunk mold 213 of the mold 21 is easily warmed by infrared rays. Since the mold bodies 111A and 112A of the pair of molds 111 and 112 are arranged inside the body mold 213, and the material M of the optical component L is installed between the mold bodies 111A and 112A, the temperature of the body mold 213 increases. The material M is reliably heated. Therefore, when pressing the material M arranged between the molding surfaces 111A1 and 112A1 of the pair of molds 111 and 112 by bringing the pair of molds 111 and 112 close to each other, the material M can be deformed into a desired shape. The optical component L with high shape accuracy can be manufactured.

(2-3-2) When the mold 21 is heated, a part of the mold body 111A of the mold 111 of the mold protrudes upward from the body mold 213, so that the outer peripheral surface of the mold body 111A is also uneven. The shape may be formed, but in this case, it takes time to process the mold body 111A.
In the present embodiment, since the concavo-convex shape is formed only on the outer peripheral surface 213 </ b> A of the body mold 213, it is possible to minimize the labor required for manufacturing the mold 21.
(2-3-3) Further, in the present embodiment, the concave and convex shape is formed by cutting the outer peripheral surface 213A of the body mold 213, compared with the case where the plating process is performed as in the first embodiment. Becomes simple. Therefore, it is possible to save time and labor for manufacturing the body mold 213.

[3. Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 7A is a cross-sectional view of the mold 31, and FIG. 7B is a front view of the mold 31.
In the first embodiment, the outer peripheral surface 113A of the body mold 113 of the molding die 11 is black. However, in this embodiment, the outer peripheral surface 313A of the body mold 313 of the molding die 31 is not black, and the outer peripheral surface of the body mold 313. The surface roughness of 313A was Ra ≧ 100 nm. The other points are the same as the mold according to the first embodiment.

(3-1) Configuration of Molding Mold The molding mold 31 of the present embodiment includes a body mold 313 and a pair of molds 111 and 112.
The entire outer peripheral surface 313A of the barrel mold 313 is blasted, and the surface roughness of the outer peripheral surface 313A is Ra ≧ 100 nm. The gloss of the outer peripheral surface 313A of the barrel mold 313 is lost.
Examples of the blasting method include a method of spraying glass beads, sand, steel balls, or the like on the outer peripheral surface 313A of the body mold 313.
The method for increasing the surface roughness of the outer peripheral surface 313A of the body mold 313 is not limited to blasting, and barrel processing may be performed. Further, the outer peripheral surface 313A of the body mold 313 may be polished with a file or the like.

(3-2) Manufacturing Method of Optical Component A manufacturing method of the optical component L using the molding die 31 having the barrel die 313 as described above will be described.
First, a body mold 313 in which the outer peripheral surface 313A is not processed is prepared. The outer peripheral surface 313A of the body mold 313 is set to Ra ≧ 100 nm.
Next, as in the above embodiments, the outer peripheral surface 131 of the press plate 13 is made black.
Since the subsequent manufacturing steps are the same as those in each of the embodiments described above, although omitted, in the molding apparatus 1 of each of the embodiments, by using the above-described molding die 31 instead of the molding die 11, The optical component L can be manufactured.

(3-3) Effects of Embodiment Therefore, according to this embodiment, the same effects as (1-3-2), (1-3-3), and (1-3-5) of the above embodiment are obtained. In addition to the following effects, the following effects can be achieved.
(3-3-1) By setting the outer peripheral surface 313A of the trunk mold 313 to Ra ≧ 100 nm, the surface area of the outer peripheral surface 313A of the trunk mold 313 increases, and the area irradiated with infrared rays increases. Thereby, the trunk mold 313 is easily warmed by infrared rays. Inside the barrel mold 313, mold bodies 111A and 112A of a pair of molds 111 and 112 are arranged, and the material M of the optical component L is installed between the mold bodies 111A and 112A. As the temperature rises, the material M is reliably heated. Therefore, when pressing the material M arranged between the molding surfaces 111A1 and 112A1 of the pair of molds 111 and 112 by bringing the pair of molds 111 and 112 close to each other, the material M can be deformed into a desired shape. A molded product with high shape accuracy can be manufactured.

(3-3-2) Since part of the mold body 111A of the mold 111 of the mold 31 protrudes upward from the body mold 313 when the mold 31 is heated, the surface of the outer peripheral surface of the mold body 111A The roughness may be Ra ≧ 100 nm, but in this case, labor for processing the mold body 111A is required.
In the present embodiment, only the outer peripheral surface 313A of the body mold 313 is set to Ra ≧ 100 nm, so that it is possible to minimize the labor involved in manufacturing the mold 31.
(3-3-3) Further, in the present embodiment, the surface roughness is adjusted by blasting the outer peripheral surface 313A of the body mold 313, and the plating process is performed as in the first embodiment. In comparison, the processing becomes simple. Therefore, it is possible to save labor for manufacturing the body mold 313.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the said embodiment, although the outer peripheral surface 131 of the press plate 13 was made black, it is not restricted to this, You may form uneven | corrugated shape in the outer peripheral surface of a press plate. Furthermore, the surface roughness of the outer peripheral surface of the press plate may be Ra ≧ 100 nm.
By increasing the surface area of the outer peripheral surface of the press plate in this way, the press plate is also efficiently warmed by the irradiated infrared rays. Since the pair of molds 111 and 112 of the molds 11, 21, and 31 are sandwiched by the press plate, heat is transmitted from the press plate to the molds 11, 21, 31, and the molds 11, 21 are transmitted by the press plate. , 31 is kept warm, and it is possible to prevent the temperature of the molds 11, 21, 31 from decreasing.

In each of the above-described embodiments, only the outer peripheral surfaces 113A, 213A, and 313A of the body molds 113, 213, and 313 of the molding dies 11, 21, and 31 are processed so that the outer peripheral surface 113A is black or the outer peripheral surface 213A has an uneven shape. The surface roughness of the outer peripheral surface 313A is not limited to this, but the outer peripheral surface to which the infrared rays of the pair of molds 111 and 112 are irradiated is processed in the same manner as the body molds 113, 213, and 313. You may give it. For example, you may perform the said process to the outer peripheral surface of the flange parts 111B and 112B of a pair of type | molds 111 and 112. FIG.
By doing in this way, a pair of type | mold will be efficiently heated by infrared rays, and the material M inside a pair of type | mold will be heated more reliably. Therefore, the material M can be deformed into a desired shape, and a molded product with high shape accuracy can be manufactured.

  Further, in each of the above-described embodiments, the entire outer peripheral surface of the barrel molds 113, 213, and 313 of the molds 11, 21, and 31 is processed to make the outer peripheral surface 113A black, or to form an uneven shape on the outer peripheral surface 213A. Although the surface roughness of the outer peripheral surface 313A is increased, the present invention is not limited to this, and the processing may be applied only to a part of the outer peripheral surface of the body mold. The area for blackening, forming an uneven shape, or roughening the surface roughness may be appropriately set according to the material of the body mold, the material of the material to be pressed, and the like.

In the first embodiment, when the outer peripheral surface 113A of the body mold 113 of the mold 11 is made black, the oxidation treatment and the black plating are performed in advance. However, the present invention is not limited to this. Good.
Similarly, when the outer peripheral surface of the press plate 13 is made black, black paint or the like may be applied.

Further, in the first embodiment, the outer peripheral surface 113A of the body mold 113 of the mold 11 is black, but in addition to this, an uneven shape may be formed on the black outer peripheral surface, as shown in FIG. The black outer peripheral surface of the body die 413 of the molding die 41 may be subjected to blasting or the like, and the surface roughness of the outer peripheral surface 413A may be Ra ≧ 100 nm. The mold 41 includes a body mold 413 and a pair of molds 111 and 112 similar to those in the above embodiments. The size and shape of the trunk mold 413 is the same as the trunk mold 113 of the first embodiment.
Furthermore, as shown in FIG. 9, the black outer peripheral surface 513A of the body mold 513 of the mold 51 is formed with an uneven shape (concave portion 513A1, convex portion 513A2), and in addition to this, the surface roughness of the outer peripheral surface 513A. The thickness may be Ra ≧ 100 nm. The mold 51 includes a body mold 513 and a pair of molds 111 and 112 similar to those in the above embodiment. The size and shape of the trunk mold 513 is the same as the trunk mold 113 of the first embodiment.
In this way, by forming an uneven shape on the black outer peripheral surface or roughening the surface roughness, the surface areas of the outer peripheral surfaces 413A and 513A of the body molds 413 and 513 are further increased, and infrared rays are irradiated. Area increases. Thereby, the molds 41 and 51 are more easily warmed by infrared rays, and the material M inside the molds 41 and 51 is more reliably heated. Therefore, the material M can be deformed into a desired shape, and a molded product (optical component) with high shape accuracy can be manufactured.

In the second embodiment, the irregular shape is formed on the outer peripheral surface 213A of the body mold 213 of the molding die 21. In addition, as shown in FIG. 10, the surface roughness of the outer peripheral surface 613A of the body mold 613 is formed. May be Ra ≧ 100 nm. The molding die 61 has a pair of dies 111 and 112 similar to those of the above embodiments and a barrel die 613, and the size and shape of the barrel die 613 is the same as the barrel die 213 of the second embodiment. .
Furthermore, in 2nd embodiment, although recessed part 213A1 along the circumferential direction of outer peripheral surface 213A was formed in outer peripheral surface 213A of the trunk | drum 213 of the shaping | molding die 21, a recessed part is restricted to what was along the circumferential direction of the outer peripheral surface. Instead, a plurality of recesses may be scattered on the outer peripheral surface of the body mold.

Next, examples of the present invention will be described.
Example 1
A mold 11 similar to that of the first embodiment was prepared. The outer peripheral surface 113A of the body mold 113 of the mold 11 is oxidized and is black. Of the pair of molds 111 and 112 of the mold 11, the molding surface 112A1 of the mold 112 is a spherical surface, and the molding surface 111A1 of the mold 111 is an aspherical surface.
Next, the glass material M was disposed between the pair of molds 111 and 112 of such a mold 11. Then, the three molds 11 were placed on the press plate 13 and the glass material was press-molded by the same method as in the first embodiment.

FIG. 11 shows the relationship between temperature, pressure, and time when the optical component L is manufactured.
The pressure in FIG. 11 is the pressure applied to the mold. Moreover, the temperature of FIG. 11 is a temperature of a shaping | molding die.
Such press molding was performed a plurality of times, and a plurality of optical components L were produced from each mold 11.
The results are shown in FIG. In the graph of FIG. 12, the horizontal axis represents the deviation from the design value of the aspherical surface of the optical component L, and the vertical axis represents the deviation from the design value of the spherical surface of the optical component L.
In FIG. 12, black circles are the inspection results of the optical component L manufactured by one of the three molds 11, and the black triangle is another one of the three molds 11. The black square is an inspection result of the optical component L manufactured by the remaining one of the three molds 11.

(Example 2)
A mold 21 similar to that of the second embodiment was prepared. An uneven shape is formed on the outer peripheral surface 213A of the body die 213 of the molding die 21, and the concave portion 213A1 extends along the circumferential direction of the outer peripheral surface 213A.
An optical component L was manufactured under the same conditions as in Example 1 except that the barrel of the molding die was different.
The results are shown in FIG. In the graph of FIG. 13, the horizontal axis represents a deviation from the design value of the aspherical surface of the optical component L, and the vertical axis represents the deviation from the design value of the spherical surface of the optical component.
In FIG. 13, black circles are inspection results of the optical component L manufactured by one of the three molds 21, and black triangles are other ones of the three molds 21. The black square is an inspection result of the optical component L manufactured by the remaining one of the three molding dies 21.

(Comparative example)
A body mold having a glossy silver outer peripheral surface was prepared.
An optical component was manufactured under the same conditions as in Example 1 except that the molding die was different.
The results are shown in FIG. In the graph of FIG. 14, the horizontal axis represents the deviation from the design value of the aspherical surface of the optical component L, and the vertical axis represents the deviation from the design value of the spherical surface of the optical component L.
Further, in FIG. 14, black circles are inspection results of optical parts manufactured with one of the three molds, and black triangles are manufactured with one of the three molds. The black square is the inspection result of the optical component manufactured by the remaining one of the three molds.

(Results and discussion)
In Examples 1 and 2, it was confirmed that an optical component with a high shape accuracy could be obtained with a small deviation from the design value of the optical component.
On the other hand, in the comparative example, the deviation from the design value of the optical component is large, and the optical component has poor shape accuracy.
From the above, it was possible to confirm the effect of the present invention that an optical component with high shape accuracy can be manufactured.

  The present invention can be used for manufacturing a molded article, for example, an optical component.

Sectional drawing which shows the shaping | molding apparatus concerning 1st embodiment of this invention. The perspective view which shows a shaping | molding die. Sectional drawing of the said shaping | molding die. The schematic diagram which shows the manufacturing process of an optical component. The figure which shows the relationship between the temperature of the shaping | molding die in the said manufacturing process, pressure, and time. Sectional drawing which shows the shaping | molding die concerning 2nd embodiment of this invention. Sectional drawing and front view which show the shaping | molding die concerning 3rd embodiment of this invention. The front view of the shaping | molding die which shows the modification of this invention. The front view of the shaping | molding die which shows the modification of this invention. The front view of the shaping | molding die which shows the modification of this invention. The figure which shows the relationship between the temperature of a shaping | molding die in an Example and a comparative example, pressure, and time. FIG. 4 is a diagram showing the results of Example 1. The figure which shows the result of Example 2. FIG. The figure which shows the result of a comparative example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Molding apparatus, 11 ... Mold, 12 ... Press means, 13 ... Press plate, 17 ... Heating means, 21 ... Mold, 31 ... Mold, 41 ... Mold, 51 ... Mold, 61 ... Mold, 111 ... Mold, 111A1 ... Molding surface, 112 ... Mold, 112A1 ... Molding surface, 113 ... Body mold, 113A ... Outer surface, 131 ... Outer surface, 213 ... Body, 213A ... Outer surface, 213A1 ... Concave, 213A2 ... Convex 313 ... barrel type, 313A ... outer peripheral surface, 413 ... barrel type, 513 ... barrel type, 513A ... outer peripheral surface, 513A1 ... concave portion, 513A2 ... convex portion, 413A ... outer peripheral surface, 613 ... barrel type, 613A ... outer peripheral surface , L ... optical components, M ... materials

Claims (11)

A molding die that includes a pair of molds arranged so that molding surfaces face each other, presses the material disposed between the molding surfaces of the pair of molds by bringing the pair of molds close to each other,
When pressing the material placed between the molding surfaces of a pair of molds, it is heated by infrared irradiation,
A molding die characterized in that a predetermined area of an infrared irradiated surface irradiated with infrared rays is black. The mold according to claim 1, wherein
The mold according to claim 1, wherein the predetermined region is previously oxidized. The mold according to claim 1, wherein
The mold according to claim 1, wherein the predetermined region is black-plated. In the shaping | molding die in any one of Claim 1 to 3,
A molding die characterized in that an uneven shape is formed in the predetermined region. In the shaping | molding die in any one of Claim 1 to 4,
A molding die characterized in that the surface roughness Ra of the predetermined region is Ra ≧ 100 nm. A molding die that includes a pair of molds arranged so that molding surfaces face each other, presses the material disposed between the molding surfaces of the pair of molds by bringing the pair of molds close to each other,
When pressing the material placed between the molding surfaces of a pair of molds, it is heated by infrared irradiation,
A mold having a concavo-convex shape formed in a predetermined region of an infrared irradiated surface irradiated with the infrared light. A molding die that includes a pair of molds arranged so that molding surfaces face each other, presses the material disposed between the molding surfaces of the pair of molds by bringing the pair of molds close to each other,
When pressing the material placed between the molding surfaces of a pair of molds, it is heated by infrared irradiation,
A molding die characterized in that a surface roughness Ra of a predetermined region of an infrared irradiated surface irradiated with the infrared rays is Ra ≧ 100 nm. The mold according to claim 7,
A molding die characterized in that an uneven shape is formed in the predetermined region. In the shaping | molding die in any one of Claim 1 to 8,
A cylindrical body that surrounds the pair of molds and guides the sliding of the molds;
The mold according to claim 1, wherein the predetermined region is an outer peripheral surface of the body mold. A mold according to any one of claims 1 to 9,
A pressing means for pressing the material disposed between the molding surfaces of the pair of molds by bringing the pair of molds close to each other;
A pair of press plates disposed between the pair of molds of the mold and the pressing means, and sandwiching the pair of molds;
An irradiation means for irradiating the mold with infrared rays;
The molding apparatus according to claim 1, wherein the outer peripheral surface of the press plate is irradiated with infrared rays from the irradiation means, and the outer peripheral surface of the press plate is black. Use a molding die with a pair of molds installed so that the molding surfaces face each other, irradiate the molding die with infrared rays, bring the pair of molds close together, and place between the molding surfaces of the pair of molds A method of manufacturing an optical component for pressing a formed material,
A material is placed between a pair of molds that have been subjected to black treatment in which a predetermined region of the infrared irradiated surface to be irradiated with infrared rays is black, and then the mold is irradiated with infrared rays and heated. Heating process;
And a pressing step of pressing the material disposed between the molding surfaces of the pair of molds by bringing the pair of molds close to each other.

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