JP2001097726A - Mold for molding optical material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for molding an optical material capable of simultaneously controlling the outer peripheries plural optical materials by a simple constitution and reducing a time and a manufacturing cost. SOLUTION: This mold for molding an optical material has plural molds for pressing an optical material by a first and a second molds, an outer periphery controlling means for controlling the outer peripheries of the optical material pressed by the molds. The outer periphery controlling means is equipped with a laminar body arranged between the first and the second molds and plural holes which are bored through the laminar body so as to correspond to installation positions of the molds and passed through the face and the back of the laminar body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical material molding die for press-molding an optical material.

[0002]

2. Description of the Related Art Conventionally, there has been known a molding die for press-molding an optical material in a mold when manufacturing an aspherical lens having a relatively small diameter. This mold is shown in FIG.
This will be described with reference to FIG. The molding device 1 includes a plurality of dies 4 supported by an upper frame 2 and a lower frame 3. In order to improve the manufacturing efficiency, a configuration is employed in which a plurality of molds 4 are provided and a plurality of optical materials can be molded at the same time.

The mold 4 includes a lower mold 5 having a female concave portion having a lower surface shape of the lens, an upper mold 6 having a female concave portion having the upper surface shape of the lens, and a ring 7 for regulating the outer periphery of the optical material to be molded.
It is composed of The upper die 6 receives pressure in a direction indicated by an arrow in FIG. 3 by a pressing plate 8 driven up and down by a hydraulic mechanism (not shown). A heating device (not shown) is arranged around the molding device 1.

[0004] When press molding an optical material by the molding apparatus 1 having the above-described configuration, first, the optical material 9 is placed on the female mold recess of the lower mold 5 and heated by a heating device (not shown). I do. Heating is performed until the temperature of the glass becomes equal to or higher than the glass transition point. By this heating, the optical material 9 softens and becomes plastic. Next, in this state, the pressing plate 8 is lowered by a hydraulic mechanism (not shown) to apply pressure to the upper die 6 to press the optical material 9. Thereby, the optical material 9 is formed into a lens shape formed between the lower mold 5, the upper mold 6 and the ring 7. Thereafter, the pressure plate 8 is gradually cooled, and the pressing plate 8 is raised by a hydraulic mechanism (not shown).
The molded lens is taken out of the lower mold 5.

[0005]

As described above, in the conventional molding apparatus 1, when the optical material 9 is press-molded,
Since the outer circumference of the optical material 9 was regulated by the ring 7 and the outer diameter was transferred, it was necessary to install the ring 7 for each mold 4. Such an installation work of the ring 7 is troublesome and time-consuming, so that there is a problem that the manufacturing cost increases. Further, after molding, the optical material 9 is difficult to be detached from the ring 7, so that
However, there has been a problem that the molding apparatus 1 is deviated from a predetermined position, causing malfunction of the molding apparatus 1. In order to prevent the ring 7 from shifting, it is necessary to fix the ring 7 by adding a part. However, if the part is added, there is a problem that the manufacturing cost increases.

The present invention has been made in view of such circumstances, and has a simple configuration that simultaneously regulates the outer peripheries of a plurality of optical materials, thereby reducing the time and the manufacturing cost of the optical material. The purpose is to provide.

[0007]

According to a first aspect of the present invention, there is provided a mold for molding an optical material, comprising: a plurality of molds for pressing the optical material by first and second molds; In a molding die of an optical material having outer periphery regulating means for regulating the outer periphery, the outer periphery regulating means comprises: a plate-shaped body disposed between a first mold and a second mold of each mold; And a plurality of holes penetrating through the front and back surfaces of the plate-shaped body.

[0008] With this configuration, since each hole provided in the plate-like body has a function similar to that in which a ring is provided in each of a plurality of molds, a single plate-like body is placed on a plurality of lower dies. The outer periphery of the optical material can be regulated just by placing
Time and manufacturing costs can be reduced. In addition, since a plurality of holes are provided in a single plate-shaped body, the ring is not displaced when the optical material after molding is separated as in the conventional case, and it is possible to prevent the molding apparatus from malfunctioning. Can be.

According to a second aspect of the present invention, in the mold for forming an optical material according to the first aspect, the plate is formed in a substantially disk shape, and the holes are arranged concentrically on the plate. Take the configuration.

As described above, since the holes are provided concentrically on the substantially disk-shaped plate, a larger number of holes can be provided in the plate and a plurality of molds arranged in a circular shape are formed. It can be applied to molds.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. The dimensional ratios in the drawings do not always match the actual dimensional ratios.

FIG. 1 is a plan view of an outer circumference regulating sleeve according to an embodiment of the present invention. As shown in FIG. 1, an outer peripheral regulating sleeve 10 according to an embodiment of the present invention includes a substantially disk-shaped sleeve main body 11 and an outer peripheral regulating hole 12 provided concentrically on the sleeve main body 11. You. The outer peripheral regulating hole 12 penetrates the front and back of the sleeve main body 11 and is provided at a position corresponding to the arrangement position of each of a plurality of molds (not shown). Therefore, the outer peripheral regulating sleeve 10 is placed on a lower mold (not shown). Then, a not-shown lower mold concave portion is exposed from each outer peripheral regulating hole 12.

As described above, the substantially disk-shaped sleeve body 11 is provided.
Since the outer peripheral regulating holes 12 are provided concentrically on the upper side, the outer peripheral regulating holes 12 can be provided more in the sleeve main body 11 and can be applied to a molding die having a plurality of dies arranged in a circular shape. Become.

Further, a positioning hole 13 is formed in the outer circumference regulating sleeve 10. The positioning hole 13 is provided in the outer peripheral regulating sleeve 1 with respect to an upper frame 21 and a lower frame 22 described later.
0 is used for positioning.

FIG. 2 is a cross-sectional view showing a state in which an optical material is pressed using the outer circumference regulating sleeve 10 according to the embodiment of the present invention. The molding device 20 includes an upper frame 21 and a lower frame 22.
Is provided with a mold 100 having a plurality of molds 23 supported by. In order to improve manufacturing efficiency, the molding die 100 is provided with a plurality of the dies 23 as described above, and is configured to be able to simultaneously mold a plurality of optical materials. Although not shown, the dies 23 are arranged concentrically in the molding die 100 in order to improve manufacturing efficiency.

The mold 23 comprises a lower mold 24 as a first mold having a female concave portion having a lower surface shape of the lens, and an upper mold 25 as a second mold having a female concave portion having the upper surface shape of the lens. Is done. The lower mold 24 and the upper mold 25 are both made of a material having predetermined heat resistance and strength, for example, a metal material, a ceramic material such as a carbide or a nitride, and are formed in a substantially columnar shape. The upper die 25 receives a pressure in a direction indicated by an arrow in FIG. 2 by a pressing plate 26 driven up and down by a hydraulic mechanism (not shown). A heating device (not shown) is arranged around the molding device 20.

The outer periphery regulating sleeve 10 regulates the outer periphery of the optical material 27 placed on the lower mold 24, and transfers the outer diameter. The outer peripheral regulating sleeve 10 is placed on the lower frame 22 and the lower mold 24 so that the projection 22a projecting from the lower frame 22 is inserted into the positioning hole 13 of the outer peripheral regulating sleeve 10. Do it. The outer peripheral regulating hole 12 in the outer peripheral regulating sleeve 10 is
And is placed on the concave portion of each lower mold 24 with high accuracy. Thus, the forming die 100 is formed by the plurality of dies 23 and the outer peripheral regulating sleeve 10.

As described above, since each outer peripheral regulating hole 12 provided in the sleeve main body 11 has the same function as that in which a ring is provided in each of a plurality of dies 23, a single The outer periphery of the optical material 27 can be regulated only by placing one outer periphery regulating sleeve 10, so that time and manufacturing cost can be reduced. In addition, since the plurality of outer peripheral regulating holes 12 are provided in the single sleeve main body 11, the ring does not shift when the optical material 27 after molding is removed as in the conventional case, and the molding apparatus 20 malfunctions. That can be avoided.

Next, the molding apparatus 2 configured as described above
The press forming of the optical material performed at 0 will be described. First, the plurality of optical materials 27 are placed on the female concave portion of the lower mold 24 and heated by a heating device (not shown). Heating is performed until the temperature of the glass becomes equal to or higher than the glass transition point. By this heating, the optical material 27 softens and becomes plastic. Next, in this state, the pressing plate 26 is moved down by a hydraulic mechanism (not shown) to apply pressure to the upper mold 25, thereby pressing the optical material 27. Thereby, the optical material 2
7 is formed into a lens shape formed between the lower mold 24, the upper mold 25, and the outer peripheral restriction hole 12. Thereafter, it is gradually cooled, and the pressing plate 26 is raised by a hydraulic mechanism (not shown),
The molded lens is taken out of the lower mold 24.

The respective concave portions of the lower mold 24 and the upper mold 25 may be arranged so as to face up and down as described above, but they may also be arranged so as to face left and right. . There is no particular limitation on the method of applying the pressing force. However, when the recesses are arranged so as to face up and down, there is an advantage that the weight of the upper mold can be used. When the concave portions are arranged to face left and right, one mold is fixed, and the other mold is provided with appropriate pressing means such as a spring or a cylinder to apply pressure to apply a pressing force to the optical material. It is also possible to apply pressure to both molds to give a pressing force.

Regarding the concave / convex shape serving as the transfer surface of the lower mold 24 and the upper mold 25, it is preferable that at least one of the transfer surfaces of the mold is a concave surface or a flat surface. 25 are both concave surfaces. By making the transfer surface a concave surface or a flat surface, the occurrence of eccentricity and uneven thickness can be more reliably prevented and the lens can be press-molded.

[0022]

As is apparent from the above description, according to the present invention, since each hole provided in the plate-like body has the same function as that in which a ring is provided in each of a plurality of molds, The outer periphery of the optical material can be regulated only by placing a single plate-shaped member on a plurality of lower molds, so that time and manufacturing cost can be reduced. In addition, since a plurality of holes are provided in a single plate-shaped body, the ring is not displaced when the optical material after molding is separated as in the conventional case, and it is possible to prevent the molding apparatus from malfunctioning. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view of an outer circumference regulating sleeve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which an optical material is pressed using the outer circumference regulating sleeve according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state where a conventional molding die presses an optical material.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Molding apparatus, 2 ... Upper frame, 3 ... Lower frame, 4 ... Mold, 5 ... Lower mold, 6 ... Upper mold, 7 ... Ring, 8 ... Pressing plate, 9 ... Optical material, 10 ... Outer periphery regulating sleeve, 11 ... Sleeve body, 1
2 ... outer circumference regulating hole, 13 ... positioning hole, 20 ... molding device,
21: upper frame, 22: lower frame, 22a: projection, 23: mold, 2
4. Lower mold as first mold, 25 upper mold as second mold, 26 pressing plate, 27 optical material, 100 molding die.

Claims (2)

[Claims] 1. An optical material forming die comprising: a plurality of dies for pressing an optical material by first and second dies; and outer-periphery regulating means for regulating the outer periphery of the optical material pressed by each of the dies. In the above, the outer circumference regulating means may be provided on the plate-like body disposed between the first mold and the second mold of each of the molds, and on the plate-like body so as to correspond to the arrangement position of each of the molds. And a plurality of holes penetrating the front and back of the plate-like body. 2. The mold according to claim 1, wherein the plate is formed in a substantially disk shape, and the holes are arranged concentrically on the plate. .