KR0134841Y1 - Device for forming an optical element - Google Patents

Abstract

In the present invention, the molding glass material is supplied by the holder and the lens is taken out by the holder, so that the size of the molding die is compact, the overall molding time is much reduced, and the required molding glass material is preheated in advance. If it is placed in the center, continuous molding can be performed, thereby improving the efficiency and reliability of the molding apparatus.

To this end, according to the present invention, a plurality of holders 11 in which the molding glass material 10 is seated in the preheating chamber 9 are placed on the shaft 13 of the first cylinder 12 to be mounted on the first cylinder 12. This is a precision pressure forming apparatus for an optical element, characterized in that the holder 11 is gradually raised to be sequentially supplied to the molding chamber (2).

Description

Precision Pressure Molding Device of Optical Element

1 is a longitudinal sectional view showing the present invention.

Figure 2 (a) and (b) is a longitudinal cross-sectional view showing the state before and after molding of the optical element according to the present invention.

Figure 3 is a longitudinal sectional view showing another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

2: molding chamber 9: preheating chamber

10: forming glass material 11: holder

12: 1st cylinder 13, 13b: axis

20: disc support 21: disc for position detection

22: position detection sensor

The present invention relates to a precision pressure forming apparatus for an optical element, and more particularly, to provide an optical glass material continuously when molding an aspherical glass lens used for a camcorder and a pickup as a molding apparatus.

In general, optical materials such as lenses, prisms, mirrors and filters are obtained by grinding a glass material into a desired shape and then polishing to obtain an optical functional surface, that is, an optical surface that transmits or reflects light.

Recently, a special mold material is used to process the surface into an optical mirror surface, and then the optical glass material is precisely press-molded with a mold to manufacture a lens having an optical mirror surface without grinding and polishing. Glassy carbon, Sic or Si ₃ N ₄ , a mixture of Sic and carbon and glass are used. To prevent fusion and improve mold release during the lens forming, thin films are coated with materials such as Pt and TiN.

If the lens is manufactured in this manner, the conventional grinding and polishing process is unnecessary, so the manufacturing cost is greatly reduced, and in order to manufacture the aspherical lens by the grinding and polishing process, the process goes through about 20 steps. Only 5-6 steps are required, and several lenses can be molded at one time, thereby greatly reducing the manufacturing cost.

Conventional lens forming method is to put the glass in the mold, and after vacuum evacuation to fill the non-oxidizing gas to heat the glass with the mold to start the press, and to cool the glass with the mold to press the glass until the transition temperature, In order to prevent oxidation of the mold, it is cooled down to 300 ° C or lower, and thus, each process such as heating, pressurization and cooling is performed in the same chamber.

However, in the molding of such a conventional lens, the glass ingot is placed in the mold, and the optical glass material is heated together with the mold to be pressurized by heating to a moldable temperature range, and then cooled to below the glass transition temperature to remove the strain of the optical glass. In order to prevent oxidation of the mold, cooling is carried out after cooling to at least 300 ° C. or lower. Since the temperature raising, pressurizing, and cooling processes are performed in one chamber, the cycle time becomes very long, and continuous molding is performed. It is impossible, and there are many problems such as lowering the energy efficiency because the temperature of the molding chamber is raised and cooled.

The present invention is to solve the above-mentioned problems, the present invention is to provide a molding apparatus to continuously supply the optical glass material to be molded when aspheric glass lens used in the camcorder and pickup, etc. can greatly improve the productivity It is an object of the present invention to provide an accurate pressure molding apparatus for an optical element.

In order to achieve the above object, the present invention provides a plurality of holders in which a molding glass material is seated in a preheating chamber so that the holders are gradually raised by the first cylinder so that the holders can be sequentially supplied to the molding chamber by the first cylinder. Precision molding machine for optical devices.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, FIGS. 1 and 2.

1 is a longitudinal cross-sectional view showing the present invention, Figure 2 (a) and (b) is a longitudinal cross-sectional view showing the state before and after molding of the optical device according to the present invention, the molding chamber ( 2) is provided, the upper and lower molds (3) (4) are provided in the molding chamber (2) facing each other, and the upper and lower molds (3) (4) are heated in the molding chamber (2). The heating element 5 is provided, and the upper and lower molds 3 and 4 penetrate the upper and lower press heads 7 (the upper and lower press heads 7) through the upper and lower support members 6 of the main body 1, respectively. 8) is installed.

In addition, in the preheating chamber 9 on one side of the molding chamber 2, a plurality of holders 11 on which the molding glass material 10 is seated are stacked and installed, and a supporting member 6 is disposed below the holder 11. The shaft 13 of the first cylinder 12 installed in the lower part is connected through, and the second cylinder 12a outside the preheating chamber 9 is moved forward and backward in the preheating chamber 9 to hold the holder 11. ) Is provided with a robot arm (14) for feeding into the molding chamber (2).

In addition, the support base 17 which supports the molded lens 15 in the cooling chamber 16 which cools and extracts the lens 15 shape | molded in the shaping | molding chamber 2 of the other side of the shaping | molding chamber 2 to below transition temperature. ) Is installed on the shaft 13a of the third cylinder 12b below the support member 6, and on the support 17 in the cooling chamber 16, the fourth cylinder 12c outside the cooling chamber 16 is mounted. Forward and backward robot arms 14a are provided.

In addition, a vacuum pump 18a is provided at an upper portion of the preheating chamber 9 and the cooling chamber 16, respectively, and the preheating chamber 9 and the cooling chamber 16 are disposed at both centers of the molding chamber 2 in the outside air. Shutters 18 and 18 for blocking the doors are provided.

According to the present invention configured as described above, as shown in FIGS. 1 and 2, the plurality of holders 11 on which the molding glass material 10 of the molding apparatus is seated is mounted on the first cylinder 12 in the preheating chamber 9. After accumulating on the shaft 13, the temperature of the shaping | molding chamber 2 and the preheating chamber 9 is raised.

The robot arm 14 picks up one holder 11 by means of a second cylinder 12a outside the preheating chamber 9 and a second through a shutter 18 between the preheating chamber 9 and the forming chamber 2. As shown in (a) of FIG. 1, the upper and lower molds 3 and 4 in the molding chamber 2 are positioned to return to their original positions. The holder 11 rises one space and waits for the next molding procedure.

The holder 11 positioned between the upper and lower molds 3 and 4 in the molding chamber 2 is pressurized by the upper and lower press heads 7 and 8 to form the glass material 10 for the lens 15. ) Will be molded.

When the molding of the lens 15 is completed, the upper press head 7 is moved upward, the shutter 19 between the molding chamber 2 and the cooling chamber 16 is opened, and then the outside of the cooling chamber 16 is removed. The robot arm 14a in the cooling chamber 16 installed in the four cylinder 12c is moved into the molding chamber 2 through the shutter 19 by the fourth cylinder 12c, and the lens 15 formed by the fourth cylinder 12c is The holder 11, which is seated, is picked up and placed on the support 17 in the cooling chamber 16, and when the shutter 19 is closed, one molding process is completed and the molding can be started again.

In the present invention, the atmosphere is vacuumed to prevent oxidation of the mold material, and when the holder 11 is supplied from the preheating chamber 9 to the molding chamber 2, a shutter between the molding chamber 2 and the preheating chamber 9 ( 18 is opened, the shutter 19 between the molding chamber 2 and the cooling chamber 16 is closed to maintain a vacuum, and after the molding glass material 10 is supplied to the molding chamber 2 Since the shutter 18 is closed so that the molding chamber 2 is sealed, the temperature of the molding chamber 2 can be kept constant at all times, thereby improving thermal efficiency.

On the other hand, as shown in FIG. 3 as another embodiment of the present invention, the shaft 13b provided in the first cylinder 12 below the preheating chamber 9 is installed through the preheating chamber 9, and the preheating chamber A plurality of disc supports 20 are installed on the shaft 13b in (9), and a plurality of holders 11 on which the plurality of molding glass materials 10 are mounted is installed on the disc supports 20, and the preheating is performed. The position sensing disc 21 is installed in the shaft 13b of the first cylinder 12 below the seal 9, and the position detection sensor 22 is installed in the first cylinder 12.

Therefore, after one holder 11 is supplied to the shaping chamber 2, the disc support 20 provided on the shaft 13b of the first cylinder 12 in the preheating chamber 9 is the disc 21 for position sensing. And the next position sensor 11 are moved to a position where the robot arm 14 can pick up.

After all the holders 11 placed on the disc support 20 of one compartment are supplied, the glass material 10 for molding is supplied by the first cylinder 12 to be moved upward by a predetermined position. As a result, a larger number of lenses 15 can be continuously formed without interrupting the molding operation.

As described above, the subject innovation of the present invention is that the glass material 10 for molding is supplied by the holder 11 and the lens 15 is also taken out by the holder 11, whereby the size of the molding die becomes compact, and the entire molding is performed. The time is much reduced, it is a useful design to improve the efficiency and reliability of the molding apparatus because the continuous molding can be carried out by placing the glass material 10 for molding as necessary in the preheating chamber 9 in advance.

Claims (2)

A plurality of holders 11 in which the molding glass material 10 is seated in the preheating chamber 9 are placed on the shaft 13 of the first cylinder 12 so that the holder 11 is opened by the first cylinder 12. The precision compaction molding apparatus of the optical collection, characterized in that it can be gradually increased to be supplied to the molding chamber (2) sequentially. The plurality of holders (11) according to claim 1, wherein the molding glass material (10) is seated on a plurality of disc supports (20) provided on the shaft (13b) of the first cylinder (12) in the preheating chamber (9). Is installed, and the shaft (13b) and the first cylinder (12), the pressure sensing device of the optical element is provided with a position sensing disc 21 and the position sensor 22, respectively.