JP2002053327A - Metallic mold for molding glass and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallic mold for molding glass which has press molding surface of minute and complex shape and is made of ceramics and its manufacturing method, in the metallic mold for molding glass optical parts having grooves of minute and complex shapes such as a hologram optical element and micro-lens and its manufacturing method. SOLUTION: The metallic mold made of ceramics 20 is manufactured by vacuum deposition method by using an original metallic mold 10 on which grooves 14 of minute and complex shapes are formed without directly machining the ceramics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a glass optical component having a surface shape such as a fine groove such as a hologram optical element and a microlens, and a method for producing the same.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 9-239603 discloses an apparatus for manufacturing a mold for molding glass optical components by processing a groove required for a mold into a base material with a cutting tool. I have.

[0003] Since a molding die for glass optical parts is used in a high temperature environment in which glass is press-molded, it is generally made of durable hard ceramics such as titanium nitride and titanium carbide. .

[0004]

However, since hard ceramics are hard, there are drawbacks in that it is difficult to process fine and complicated shapes, and that processing takes time. Furthermore, hard ceramics are difficult to cut,
Since the grooves are formed by grinding, there is also a disadvantage that the final shape of the mold is limited due to restrictions on the processing.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a glass molding die made of ceramics having a press-formed surface having a fine and complicated shape, and a method of manufacturing the same.

[0006]

According to the present invention, in order to achieve the above-mentioned object, a ceramic particle is deposited by a vapor deposition method on an original die having a surface shape required as a die. A duplicate mold is manufactured, and the duplicate mold is separated from the original mold and used as a glass molding mold.

Further, in order to achieve the above object, the present invention provides a base mold made by processing a surface shape required as a mold on a substrate made of a material such as aluminum or copper which is easy to process. The ceramic mold is deposited on the processing surface of the original mold by a vapor deposition method to produce a ceramic duplicate mold in which the surface shape has been transferred. It is characterized in that it is separated from the original mold and the duplicate mold is used as a glass molding mold.

According to the present invention, first, an original die is manufactured by processing a base material made of an easily processable material such as aluminum or copper into a fine and complicated shape required as a die. . Next, ceramic particles are deposited on the processing surface of the original die by a vapor deposition method, thereby producing a ceramic duplicate die to which a fine and complicated shape is transferred. Next, the duplicate mold is separated from the original mold, and the duplicate mold is used as a glass molding mold. This makes it possible to provide a highly durable ceramic glass molding die having a pressed surface with a fine and complicated shape.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a glass molding die according to an embodiment of the present invention will be described with reference to FIGS. These figures show an example of a method of manufacturing a mold for molding a glass optical component having fine and complicated grooves such as a hologram optical element and a microlens. In addition, the surface shape of the mold in the present invention may be not only a groove but also a rectangular shape such as a step, or a three-dimensional curved surface having a small curvature that is difficult to machine by grinding.

FIG. 1 shows a method of manufacturing the original mold 10. The original die 10 is formed by cutting grooves 14 having a fine and complicated shape required as a die with a cutting tool 16 on a surface 12A of a base material 12 made of a material such as aluminum or copper which is easily cut. It is produced by

As a method and an apparatus for cutting the groove 14 using the cutting tool 16, the present applicant has disclosed in Japanese Patent Application Laid-Open No. H11-320241.
An example is disclosed in Japanese Patent Publication No. Such a method and apparatus include moving means for relatively moving the base material 12 and the cutting tool 16 in the three orthogonal directions of X, Y, and Z, and turning the cutting tool 16 around a cutting progress direction axis through which the tip of the cutting tool 16 passes. Rotating means for changing the posture of the cutting tool 16 by moving the cutting tool.
By rotating the cutting tool 16 by the turning means while relatively moving the base material 12 and the cutting tool 16 by the moving means,
V-shaped groove 1 having two or more cross-sectional shapes with one cutting tool 16
4 can be formed, and the groove 14 having a fine and complicated shape can be cut.

FIG. 2 shows that the ceramic particles 18, 18... Of FIG. 2 are deposited on the surface 12A (see FIG. 1) of the original mold 10 in which the grooves 14 of fine and complicated shapes are formed by a vapor deposition method. By forming the ceramic-based hard film 20, the grooves 22 to which the fine and complicated grooves 14 are transferred are formed.
A method for producing a ceramic duplicate mold 24 (see FIG. 3) is shown.

Ion plating and thermal CVD are used for forming the ceramic hard film 20 such as titanium nitride and titanium carbide by a vapor deposition method. For example, when a titanium nitride film is coated on the original mold 10 by ion plating, titanium is evaporated in a vacuum chamber to be ionized, and nitrogen is introduced to cause a chemical reaction. , ARE (Activated Reac
It is preferable to employ a tive evaporation method.

FIG. 4 shows a state where the duplicate mold 24 manufactured by the ARE method is separated from the original mold 10. Since the groove 22 which is a press-molded surface to which the fine and complicated shape groove 14 of the original mold 10 is transferred is formed in the peeled duplicate mold 24, the duplicate mold 24 is used as a hologram optical element. Used as molding dies for glass optical components having fine grooves such as microlenses.
As a method of peeling, a method of heating two molds and peeling according to a difference in thermal expansion coefficient or the like can be adopted.

Therefore, according to the method of manufacturing a glass forming die of the present embodiment, the original die 10 having the fine and complicated grooves 14 is formed without directly cutting the ceramics. Since the ceramic mold 24 is manufactured by the vacuum evaporation method, it is possible to provide a highly durable glass mold 24 capable of press-molding a fine and complicated shape on glass.

In the embodiment, the mold for molding a glass optical component having fine grooves such as a hologram optical element and a microlens has been described. However, if this mold is used, a complicated shape can be obtained. Since the parts can be press-molded, they are not limited to glass optical parts, but can also be applied as molds for producing microparts such as micromachine parts.

[0017]

As described above, according to the glass forming mold and the method of manufacturing the same according to the present invention, a fine and complicated shape as a mold is machined on a substrate made of a material which is easy to machine. The original mold was used to produce a ceramic duplicate mold by vapor deposition, and this duplicate mold was used as a glass molding mold. It is also possible to provide a highly durable ceramic glass mold capable of press-molding a complicated shape.

[Brief description of the drawings]

FIG. 1 is a diagram showing a processing state in which an original mold is manufactured.

FIG. 2 is a view showing a state in which ceramic particles are deposited on an original mold by a vapor deposition method.

FIG. 3 is a diagram showing a state in which a ceramic duplicate mold is formed in an original mold.

FIG. 4 is a view showing a state where a ceramic duplicate mold is separated from an original mold.

[Explanation of symbols]

10: base mold, 12: base material, 14: groove, 16: bite,
18: ceramic particles, 20: ceramic hard coating, 22: groove, 24: duplicate mold

Claims (2)

[Claims] 1. A ceramic duplicate mold is prepared by depositing ceramic particles by a vapor deposition method on a mold having a surface shape required as a mold. A glass molding die, which is separated from the die and used as a glass molding die. 2. An original mold is manufactured by processing a surface shape required as a mold on a base material made of a material such as aluminum or copper which is easy to process, and the processed surface of the original mold is formed. Then, by depositing ceramic particles by a vapor deposition method, a duplicated mold made of ceramics having the surface shape transferred thereon is produced, and the duplicated mold is separated from the original mold. A method for producing a glass molding die, which is used as a glass molding die.