KR20090106293A - An apparatus having injection mold, and a method for injectoin and a production method of a stamper for an injection mold - Google Patents

Abstract

PURPOSE: An injection molding apparatus, an injection method, and a method manufacturing a stamper for injection molding are provided to form an accurate micro-pattern on a molded product by keeping the stamper temperature above the specific temperature. CONSTITUTION: An injection molding apparatus comprises a first mold(10), a second mold(20), a stamper(500), and a temperature controller(85). The first mold has a cavity(11) inside. The second mold is arranged to be detachable to the first mold. The stamper is provided between the first mold and the second mold, and has a micro-pattern(510). The temperature controller adjusts the temperature of the stamper.

Description

Injection Molding Device and Injection Method and Manufacturing Method of Stamper for Injection Mold {AN APPARATUS HAVING INJECTION MOLD, AND A METHOD FOR INJECTOIN AND A PRODUCTION METHOD OF A STAMPER FOR AN INJECTION MOLD}

The present invention relates to an injection mold, an injection method, and a method for manufacturing a stamper for an injection mold, and more particularly, an injection mold apparatus and an injection method using the injection mold, which can produce an injection molded product having a fine pattern more efficiently and economically. And a stamper manufacturing method for the injection mold.

Injection molding is a method of injecting and filling molten resin into a cavity of a mold having a predetermined shape, and cooling the same to form a product having the same shape as the cavity.

In particular, such injection molding is a manufacturing method generally used to produce a large quantity of plastic products, and with the development of the times, the demand for plastic products composed of high strength and durable polymers has increased significantly. Is also being applied to various fields.

Recently, the injection molding method has been used to produce not only general household plastic products but also plastic products used in aerospace and precision optical devices, and is particularly applied to products requiring fine and precise patterns.

That is, injection molding is used as a method for producing a plastic structure in which fine patterns of several tens of nanometers to several tens of micrometers exist on the surface.

However, in order to provide a plastic molding having such a nano- or micro-sized micropattern, a separate stamper corresponding to the micropattern is used, and the stamper is generally provided in a form of a plate.

By using a stamper having such a fine pattern, a molded article that can realize an optical effect according to the reinforcement interference and the extinction interference phenomenon of light can be manufactured, for example, by using a nano line width according to such a fine pattern or using a high resolution spectrometer. In addition, by forming a pattern for promoting the scattering of light can be used as a backlight unit (Back Light Unit) of the LCD component.

In addition, the photonic band gap effect may be generated through a regular arrangement of the ultra fine patterns, thereby reflecting only light having a specific wavelength in the ultra fine pattern and transmitting and absorbing the remaining light.

Generally, a LIGA (Lithographie, Galvanoformug, Abformung in German) process is used to fabricate a stamper having such a fine or ultra fine pattern. That is, the process includes the steps of washing the substrate, applying a photoresist film on the thin substrate, performing a soft bake of the applied photoresist film, raising and exposing a predetermined pattern mask, and developing through the exposed photoresist film. Forming a shape of a predetermined shape through heat baking (Hard Bake) where the photoresist film is partially removed, depositing a conductive layer (Cu, Ni, etc.) film on the fabricated shape, and finished pattern metal (Cu, Ni) Etc.) a step of manufacturing a master stamper on the surface by nickel plating, and a step of manufacturing the stamper by releasing and replating the master stamper.

By the way, the manufacturing method of such a stamper is useful in time and cost to manufacture a stamper having a pattern of micro size (1 μm or more), but it is time or costly to produce a stamper having a pattern of nano size (less than 1 μm). Inappropriate This is because precision is greatly required in the case of exposure and heat treatment.

In addition, even when the pitch and height of the pattern are adjusted by the LIGA method, there is a problem that the precision of the process must be high and the cost is high.

In addition, the LIGA method has a problem that it is difficult to produce a disk-shaped stamper having a large area (4 inches or more in diameter), and that such a stamper is difficult to curvature.

After all, when manufacturing a stamper by the LIGA method and injection molding using it, there is a problem that takes a lot of cost and time when changing the shape of the injection molded product or changing the value of a certain component.

In addition, in the case of producing an injection molded product having a fine pattern by using a general injection mold, the surface of the stamper has a temperature below the glass transition temperature of the resin so that the injection molded product hardens before the fine pattern is completely transferred to the injection material. There was also a problem that the generation of the fine pattern was incomplete.

The present invention is to solve the problems as described above, in the case of producing an injection-molded product by injection molding using a stamper having a fine pattern requiring precision, it is possible to change the specifications such as the shape change of the stamper and pitch It is an object of the present invention to provide an invention capable of producing various types of injection moldings by making it easy.

In addition, another object of the present invention is to maintain the temperature of the stamper at a predetermined temperature or more during the injection process so that the fine pattern can be completely formed in the injection molding.

According to an aspect of the present invention, there is provided a first mold part in which a cavity is formed; a second mold part disposed to be fastened to the first mold part; and provided between the first mold part and the second mold part. A stamper on which fine patterns are formed; It provides an injection mold apparatus, characterized in that it comprises a temperature control device for adjusting the surface temperature of the stamper.

In addition, the temperature control device and the heater provided in the second mold; A cooling mold disposed to be in contact with the second mold part; It characterized in that it comprises a cooling mold drive unit for driving the cooling mold.

In addition, an accommodating part provided in the second mold part and the cooling mold accommodated therein; And a guide member provided in the accommodation part to guide the movement of the cooling mold.

In addition, the cooling mold is characterized in that the slide is arranged to be movable along the guide portion.

The cooling mold driving unit may further include a first magnet part provided in the second mold part; and a second magnet part provided in the cooling mold part, wherein the first magnet part and the second magnet part are attracted to each other. Alternatively, the repulsive force may be generated to space or contact the second mold part and the cooling mold.

In addition, any one of the first magnet portion and the second magnet portion is characterized in that the electromagnet and the other is composed of a permanent magnet.

The cooling mold driving unit may include a servo motor provided outside the second mold unit and an inside of the accommodating unit and connected to the cooling mold to connect the cooling mold to the second mold according to an operation signal of the servo motor. Injection mold apparatus further comprises a moving member for contacting or spaced apart.

In addition, the cooling die driving unit and the hydraulic device provided outside the second mold; And a cylinder member provided inside the accommodating part and connected to the cooling mold to contact or space the cooling mold to the second mold according to an operation signal of the hydraulic device.

In addition, the fine pattern of the stamper is characterized in that it is provided in a pattern corresponding to the dimple structure so that the structure formed on the surface of the injection molded product is a dimple structure.

In addition, the stamper is characterized in that composed of a metallic material.

In addition, the stamper is characterized in that made of nickel (Ni).

In addition, the temperature control device is characterized in that it is provided to raise the surface temperature of the stamper above the glass transition temperature of the resin flowing into the cavity.

The present invention also includes a stamper heating step of heating a stamper having a fine pattern formed between the first mold portion and the second mold portion; Moving the mold part in close contact with the first mold part and the second mold part such that a sealed cavity is formed between the first mold part and the second mold part; A resin inflow step of introducing molten resin into the first and second mold parts; A cooling step of cooling the first and second mold parts and the stamper after the resin inflow step is finished; It provides an injection method characterized in that it comprises a step of separating the mold portion spaced apart the first, second mold portion to release the injection.

In addition, the stamper heating step is to increase the surface temperature of the stamper above the glass transition temperature of the resin before the resin inflow step.

In addition, the heating step of the stamper is characterized in that performed by operating the heater built in the second mold portion is attached to the stamper.

In addition, the cooling of the stamper may be performed by contacting the second mold part with a cooling mold disposed to be spaced apart from the second mold part.

In addition, the present invention is a metal layer oxidation step of forming a predetermined fine pattern on the metal layer by performing anodization on the metal layer deposited on the substrate; by applying a predetermined voltage to the oxidized metal layer to reduce the size of the fine pattern Regulating voltage applying step; An etching step of removing the oxide layer formed on the metal layer; Plating a predetermined metal layer on the pattern so as to form a stamper on which the fine pattern formed after removing the oxide layer is formed; It provides a stamper manufacturing method for an injection mold apparatus, characterized in that it comprises a stamper separation step of separating the stamper formed with the fine pattern.

The voltage applied to the voltage applying step may be locally applied differently according to the oxidized metal layer so that light interfering with the fine pattern of the stamper is locally changed.

As described above, by enabling rapid temperature control of the stamper, the transferability of the stamper to the fine pattern may be improved.

In addition, as the temperature control is made rapidly, the productivity of the injection molding may also be improved.

In addition, there are advantages in that injection moldings of various shapes and colors can be produced easily and at low cost.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

As disclosed in Figure 1, the configuration of the injection apparatus is used as the injection mold according to the present invention is as follows.

First, the injection mold according to the present invention includes a first mold part 10 and a second mold part 20, and the cavity forming a space into which the molten resin flows in the first mold part 10 ( 11) is formed.

Here, it is preferable that a heating device such as the first heater 13 and a coolant flow path 12 through which a coolant flows are embedded in the first mold part 10 so that the resin does not solidify during injection molding.

The second mold part 20 is provided with a second heater 22 capable of heating the temperature of the second mold part 20 therein, and the second heater 22 is located behind the second heater 22. A cooling mold 30 capable of cooling the mold part 20 is provided.

The cooling mold 30 is disposed to be movable in a separate accommodating portion 25 provided in the second mold portion 20, and the cooling mold 30 is moved within the accommodating portion 25. The guide member 40 for guiding is provided.

An electromagnet 35 and a permanent magnet 59 are disposed in the cooling mold 30 and the second mold part 20, respectively. Thus, the electromagnet 35 and the permanent magnet 59 are disposed, and the electromagnet 35 is disposed. When a constant current is applied), attraction or repulsive force is generated between the electromagnet 35 and the permanent magnet 59, and when the attraction occurs, the cooling mold 30 and the second mold portion 20 come into contact with each other. The second mold part 20 is cooled.

A cooling water flow path 33 through which cooling water flows is provided in the cooling mold 30, and when cooling of the second mold part 20 is required, the cooling water flows into the cooling water flow path 33. 20) and the temperature of the stamper 500, which will be described later, are rapidly cooled, whereby the resin filled in the first and second mold parts 10 and 20 is solidified to form a molded product.

One side of the first mold portion 10 is provided with a first mold support block 58 for supporting the first mold portion 10, the portion spaced apart from the first mold support block 58 by a predetermined interval A second mold support block 60 for supporting the second mold part 20 is provided.

The rear of the second mold part 30 protrudes from the second mold support block 60 to move the second mold part 20 to the first mold part 10 or to the first mold part 10. ) Is provided with a mold moving part 38 spaced apart.

One side of the first mold support block 58 is provided with a resin supply device 80 for moving the molten resin in the direction of the first mold portion 10, the hopper for receiving the molten resin in the upper portion of the resin supply device 70 is provided.

At this time, the resin supply device 80 and the first mold support block 60 and the first mold part 10 to guide the molten resin from the outlet portion of the hopper 70 to the first mold part 10. ) Is provided with a resin flow path 82. Although not shown, it is preferable that a separate transfer device for rapidly moving the molten resin to the first mold part 10 is disposed in the resin flow path 82.

The base blocks 84 supporting the first and second mold support blocks 58 and 60 and the resin supply device 80 are provided.

Meanwhile, one side of the second mold part 20 is provided with a stamper 500 having a fine pattern 510 of nano or micro size, and the stamper is attached to one surface of the second mold part 20. A stamper attachment portion 20 'is provided.

However, in the drawing, the fine pattern 510 of the stamper is largely drawn to clearly show this, but is not actually identified by the naked eye.

The stamper attachment part 20 'is provided with a fixing device such as a holder (not shown) or a jig (not shown) for fixing the stamper, and the position thereof changes when the stamper 500 contacts the molten resin during injection molding. It is desirable that there is no.

Since the stamper 500 is generally made of a metal material such as nickel, the surface temperature of the stamper 500 is significantly lower than that of the molten resin used during injection molding.

Accordingly, when the relatively low temperature stamper 500 and the high temperature molten resin come into contact with each other, the stamper 500 may be hardened before the fine pattern 510 is completely hardened to the molding. There is a need to maintain above the glass transition temperature (Tg) of the constituent polymers.

Here, the glass transition temperature means a point where the polymer material is active and starts to move according to the temperature. When the glass transition temperature is lower than the glass transition temperature, the resin of the polymer becomes a solid state and when the glass transition temperature is higher than the glass transition temperature, it is a fluid substance such as rubber. And ultimately become liquid.

Therefore, the liquid phase of the resin must be maintained for a predetermined time in order that the resin in contact with the stamper 500 forms the same pattern as the fine pattern formed on the stamper in the injection molding formed by the resin. Therefore, during that time, the surface temperature of the stamper should be in the glass transition temperature state.

The glass transition temperature varies depending on the characteristics of the polymer material, but in this embodiment, it is preferable that the glass transition temperature is about 100 ° C to 120 ° C.

On the other hand, the temperature control device 85 is provided in the base block 84 portion of the injection device.

In particular, since the cooling mold 30 and the second heater 22 provided in the second mold part 20 mainly perform rapid heating and rapid cooling of the stamper 500, the temperature control device 85 ) Is to play its role mainly on the rapid temperature control of the surface of the stamper (500).

According to the first embodiment of the present invention, a case of injection molding using the stamper 500 having the fine pattern 510 will be described.

As shown in FIG. 1, first, the stamper 500 having the fine pattern 510 is coupled to and fixed to the stamper attaching part 20 ′ of the second mold part 20. Subsequently, when a separate operation button is input to command the surface temperature of the stamper 500 and the first and second mold parts 10 and 20 to be above a predetermined temperature, the first and second heater parts 13, 22, the first and second mold parts 10 and 20 are heated by a heat resistance, and the stamper 500 is also heated to be above a predetermined temperature.

The time for the stamper 500 to reach a constant temperature, for example, the glass transition temperature, generally takes about 1 minute from immediately after the heater is operated.

At this time, since the repulsive force is generated between the permanent magnet 28 and the electromagnet because a constant current flows in the electromagnet 35, the second mold part 20 and the cooling mold 30 maintain the separation state.

As such, while the second mold part 20 and the cooling mold 30 are kept apart, the first and second mold parts 10 and 20 and the stamper 500 are kept heated. As disclosed in FIG. 2, when the second mold part 20 moves in the direction of the first mold part 10 and both are bound, an injection product is formed between the first mold part 10 and the stamper 500. A hermetically sealed cavity 11 is formed.

As shown in FIG. 3, in the state where the first and second mold parts 10 and 20 are in close contact with each other to form a closed cavity 11, the molten resin R is formed through the resin flow path 82. 11) flows into the inside to fill the cavity 11, and the molten resin R is introduced between the fine patterns 510 of the stamper 500 to simulate the fine patterns 510 as they are. do.

Thereafter, when the operation of the first and second heaters 13 and 22 is stopped and the repulsion between the electromagnet 35 and the permanent magnet 59 is generated, the cooling mold 30 causes the second mold part ( 20, and when the cooling water flows into the cooling water flow path part 33 of the cooling mold 30 and the cooling water flow path part 12 of the first mold part 10, the first and second mold parts 10 20 and the stamper 500 are cooled, so that the resin filled in the cavity 11 is solidified.

Subsequently, as shown in FIG. 4, when the second mold part 20 is spaced apart from the first mold part 10, the fine pattern part 510 of the stamper 500 is formed in the opened cavity 11. The patterned injection molding product F is obtained.

5 is related to the second embodiment of the present invention. The difference from the first embodiment is that the cooling mold is moved by the repulsive force and the attraction force of the permanent magnet and the electromagnet in the first embodiment. The cooling mold is moved by the servo motor 90 outside the second mold portion.

To this end, a moving member 92 is provided inside the housing portion 25 to move or space the cooling mold 30 in the direction of the second mold portion 30.

Here, the moving member 92 is able to push or pull the cooling mold in accordance with the drive of the servo motor 90. The servo motor 90 in the second embodiment can follow the correct position and speed according to an external signal, thereby enabling accurate control of the movement of the cooling mold 30.

Since the components other than the servo motor 90 and the moving member 92 and the operation thereof are the same as in the first embodiment, description thereof will be omitted.

6 is a view of a third embodiment of the present invention, wherein the apparatus for moving the cooling mold 30 includes a hydraulic device or a pneumatic device 95, and the cooling mold ( A cylinder 98 is provided which is connected to 30. Therefore, the cylinder 98 pushes or pulls the cooling mold 30 toward the second mold part 20 by the operation of the hydraulic device or the pneumatic device, so that the cooling mold 30 and the second mold part are pulled out. By contacting or spaced apart from the 20, it is possible to control the cooling of the second mold portion 20 and the stamper 500.

The stampers 500 used in the first to third embodiments are not manufactured by the LIGA method as in the prior art, but are manufactured by the AAO (Anodized Aluminum Oxide) method. Let's learn how to adjust the pattern pitch.

First, in the manufacturing process of a master stamp for providing a metal stamper used in the injection mold, as shown in FIG. 7A, a metal 400 such as aluminum (Al) is formed on a predetermined substrate 300 through 5 to 5. After 10 μm deposition, as shown in FIG. 7B, the surface roughness is preferably adjusted to 3 to 5 nm or less through an electropolishing process.

Next, as shown in FIG. 7C, the nanoparticles having a pitch or radius of a predetermined size are performed by performing the first anodization step, the etching step as shown in FIG. 7D, and the second anodization step as shown in FIG. 7E. A master stamper made of a metal oxide in which the pattern 410 or the holes of the size are regularly distributed is provided.

Looking out the respective steps in detail, and changes to a 1 when the car goes the anodizing the aluminum layer 400 of alumina _{(Al 2 O 3) (400} ') partially in contact with around the release of, as shown in Figure 7c, The fine pattern 410 having a predetermined depth is formed.

Next, when the alumina generated by the first anodization process is removed by performing an etching process as shown in FIG. 7D, only aluminum 400 remains on the upper surface of the substrate 300 as shown.

Next, as shown in FIG. 7E, when the second anodization step is performed, aluminum is changed to alumina 440. In this process, the fine pattern 420 has a depth close to the surface of the substrate 300, and the width thereof is widened. In this process, a barrier layer 430 made of by-products formed during anodization is formed between the micropattern 420 and the substrate 300.

When the barrier layer 430 is removed using an acid solution, a master stamper having a fine pattern 420 is manufactured.

Then, a structure 500 such as nickel (Ni) or copper (Cu) covering them on the fine pattern is formed through an electroforming process, as shown in FIG. 7g, and then the plated structure 500 is formed as shown in 7h. When the substrate is removed from the substrate, a durable metal stamper having a predetermined fine pattern 510 is manufactured.

As such, the AAO method enables accurate and reproducible control, and can produce a stamper having a desired pattern simply and inexpensively.

On the other hand, when manufacturing the master stamper, it is possible to control the color of the master stamper by adjusting the pitch of the pattern, which is a specific wavelength by the extinction interference and reinforcement interference of light when the light is incident on the nano-scale fine pattern Light is reflected and takes on its color, and light of other specific wavelengths takes advantage of the characteristic that the fine pattern becomes excessive and invisible.

This is using the wave nature of light.

As such, when the pitch of the fine pattern is adjusted, the color of one stamper may be a single color, or may have different colors locally.

That is, as disclosed in FIG. 8, a substrate on which the aluminum 400 is deposited is disposed on a base plate 620 for manufacturing a master pattern, and after the electrolyte is introduced, the plurality of electrodes 620 are mutually circular. Place them apart. Then, a wire (A) for supplying a voltage to the substrate is connected.

On the other hand, the cover 700 is covered on the base plate 600, the first installation hole 610 formed in the base plate 600 and the second installation hole 710 formed in the cover 700 correspond to each other It is provided so as to insert a predetermined fixing member in the first and second installation holes (610 and 710) so as not to be separated from each other during the manufacturing process of the master stamper.

 When a predetermined voltage is applied to each electrode 6220, a fine pattern is formed on the substrate by the oxidation as described above.

 When the same voltage is applied to each electrode, a pattern of the same pitch is formed over the entire substrate. However, when a voltage applied to some electrodes and a voltage applied to another electrode are differently applied, as shown in FIG. The pitch of the fine pattern is different every time, and as each pitch is different, the range of wavelengths that can be constructive interference is different, and thus the color seen locally from the outside is different.

An example in which the pitch of the fine pattern varies according to the applied voltages 130V to 170V so that the color of the master stamper has each unique color is clearly shown in FIG. 10.

Subsequently, the metal stamper that mimics such a master stamper through the plating process also has a micropattern having a different pitch locally, and when the injection molding is performed using such a metal stamper, the molding also has such a micropattern so that various colors can be obtained. It will be able to produce an injection molding having.

On the other hand, using the AAO process apparatus disclosed in Figure 8, it is possible to perform a uniform oxidation process on each substrate. That is, by uniformly disposing the electrode 620 in contact with the substrate around the substrate, it is possible to reduce the voltage / current variation, it is also possible to manufacture a large area stamper.

11A through 11F illustrate a process of manufacturing a curved master stamp and a metal stamper. When the AAO process is used, a curved stamper may be obtained by performing the process performed in FIG. 7A on FIG. 7A on a curved aluminum substrate. . That is, in LIGA, steps such as photoresist coating, heat treatment, and exposure must be performed precisely. Therefore, it was difficult to produce a stamper with curvature, but the aluminum substrate with curvature corresponds to the curved surface through the above-described AAO process. To be able to manufacture a metal stamper, it is possible to produce an injection molding having a curved surface using this metal stamper.

Since the manufacturing process of the curved stamper is the same as the stamper process in a planar state, a detailed description thereof will be omitted.

12 and 13 are to perform the injection molding operation using the above-described surface stamper, when the injection operation using this surface stamper can produce an injection molding having a curved surface, and if the surface of the stamper variously modified Therefore, it is possible to manufacture injection moldings of various forms.

Accordingly, the injection molding operation is substantially the same as the process using the injection apparatus disclosed in FIGS. 1 to 6, and thus a detailed description thereof will be omitted.

Figure 14 (a) shows a fine pattern of the stamper, Figure 14 (b) and Figure 14 (c) is an injection molding apparatus according to the present invention in the case of injection molding the fine pattern of the stamper is a rapid temperature control device The pattern formed on the injection molding when not used and when used is shown.

That is, FIG. 14 (b) shows that when the rapid temperature control device as in the present invention is not used, dimple-shaped fine patterns are not properly formed on the surface of the injection molding, and walls between the fine patterns are formed relatively thick.

This means that the resin melt was hardened by the stamper's low temperature before the fine pattern of the stamper was completely transferred to the resin melt.

In the case of the present invention, a dimple having a relatively thin wall was formed as shown in FIG. 14 (c) by using a rapid temperature controller, and its shape was also not significantly different from the fine pattern of the stamper shown in 14 (a). Able to know.

In other words, this means that using a rapid temperature control device, the transferability to the stamper is significantly improved.

On the other hand, Figure 15 (a) shows the depth of the micro pattern of the stamper through the atomic force microscope (AFM), Figure 15 (b) and Figure 15 (c) using a rapid temperature control device through the atomic force microscope (AFM) Depth of micropatterns in injection moldings with and without use is shown. Here, the stamper fine pattern is embossed, and the fine pattern of the injection molded product is engraved.

As shown in Fig. 15 (b), when the rapid temperature control device is not used, it can be seen that the wall of the micropattern such as the dimple is somewhat smooth and its depth is about 100 nm.

However, as shown in 15 (c), when the rapid temperature control device according to the present invention is used, it can be seen that the wall of the fine pattern is sharp and its depth is close to about 150 nm.

Figure 16 shows a control block diagram according to the present invention. In this case, the input unit of the control unit 800 for controlling the injection apparatus is provided with a power supply unit 810 for supplying power, and an operation unit 820 for allowing a user to operate the injection apparatus.

On the other hand, the output of the control unit 800, the mold moving part 38 for driving the second mold part, and the second heater 22 and the second heater 22 and the temperature to adjust the temperature of the stamper The temperature control device 85 for controlling the cooling mold 30 and the resin supply unit 80 for supplying the resin in the cavity direction is connected. In addition, a first heater 13 for heating the first mold part 10 is also connected to the output part of the controller 800.

17 is a control flow chart according to the present invention, the control flow according to the present invention is as follows.

First, when a command for injection molding is input, the first mold is heated using a first heater (S100), and the temperature control device is driven to raise the temperature of the stamper (S102). At this time, the second heater is also operated. The second mold portion and the stamper are heated.

In this case, the cooling mold maintains the spaced apart state of the second mold, so that the heat of the second heater can be transmitted without being disturbed by the stamper.

In this state, the second mold part moves and is bound with the first mold part (S103). In that state, if it is determined that the temperature of the stamper is lower than the glass transition temperature (Tg) of the resin, the continuously When the heat is transferred to the stamper, and it is determined that the glass transition temperature (Tg) or more (S104), the temperature control device is stopped to stop the heat supply to the stamper (S105) and the resin is supplied into the cavity (S108).

This is because the fluidity of the resin is ensured by the residual heat remaining in the stamper because the heat supply to the stamper is stopped, and in general, the time for the resin to be introduced and solidified by injection molding is relatively short.

Then, it is determined whether or not the resin supply is completed (S109), and then after the pressure-receiving process of additionally supplying air so that the resin is completely filled (S110), the first heater is stopped (S112), and then the first The mold part and the second mold part are cooled (S114).

Here, the cooling of the first mold part is performed by supplying cooling water to the cooling water flow path provided in the first mold part, and the cooling of the second mold part and the stamper is performed by the cooling mold provided with the cooling water flow path contacting the second mold part. Will be done.

Thereafter, when it is determined that the cooling is performed to a certain degree, after separating the first mold part and the second mold part (S116), the injection process is completed when the injection product is withdrawn from the first mold part (S118).

1 to 4 are side views of the injection mold apparatus according to the first embodiment of the present invention.

5 is a side view of an injection mold apparatus according to a second embodiment of the present invention.

6 is a side view of an injection mold apparatus according to a third embodiment of the present invention.

7 (a) to 7 (h) are side cross-sectional views showing the manufacturing process of the stamper used in the injection mold of the present invention.

8 is a plan view of an apparatus for manufacturing a stamper of the present invention.

9 is a side cross-sectional view showing a manufacturing process of a stamper according to the present invention.

10 is a view showing the color change of the stamper according to the change in the applied voltage.

11 (a) to 11 (f) are side cross-sectional views showing the manufacturing process of the curved stamper used in the injection mold of the present invention.

12 to 13 are side views of an injection mold apparatus using a curved stamper.

Fig. 14A is an enlarged photograph of the fine pattern of the stamper of the present invention.

Figure 14 (b) is an enlarged photograph of the fine pattern of the injection molding without the temperature control device.

Figure 14 (c) is an enlarged photograph of the fine pattern of the injection molded product in the state using the temperature control device.

Fig. 15A is a graph showing the fine pattern of the stamper of the present invention.

Figure 15 (b) is a graph showing a fine pattern of the injection molding without the temperature control device.

Figure 15 (c) is a graph showing a fine pattern of the injection molding in the state using a temperature control device.

* Description of the main composition of the invention *

10: first mold part 20: second mold part

25: accommodating part 30: cooling mold

35: electromagnet 59: permanent magnet

90: servomotor 95: hydraulic device

85: thermostat 500: stamper

510: fine pattern

Claims (18)

A first mold part in which a cavity is formed; A second mold portion disposed to be bindable to the first mold portion; A stamper provided between the first mold part and the second mold part and having a fine pattern formed thereon; Injection mold apparatus characterized in that it comprises a temperature control device for adjusting the temperature of the stamper. The method of claim 1, The temperature control device A heater provided in the second mold part; A cooling mold disposed to be in contact with the second mold part; Injection mold apparatus characterized in that it comprises a cooling mold drive unit for driving the cooling mold. The method of claim 2, Provided in the second mold part An accommodating part in which the cooling mold is accommodated; And a guide member provided inside the accommodating part to guide the movement of the cooling mold. The method of claim 3, The injection mold apparatus, characterized in that the cooling mold is arranged to be slideable along the guide portion. The method of claim 2, The cooling die driving unit A first magnet part provided in the second mold part; Further comprising a second magnet portion provided in the cooling mold, The first magnet part and the second magnet part is an injection mold apparatus, characterized in that the attraction or repulsive force generated between each other to separate or contact the second mold portion and the cooling mold. The method of claim 5, Injection mold apparatus, characterized in that any one of the first magnet portion and the second magnet portion is composed of an electromagnet and the other is composed of a permanent magnet. The method of claim 2, The cooling mold driving unit is provided with a servo motor provided outside the second mold unit, and is provided inside the accommodating unit and connected to the cooling mold to contact the cooling mold with the second mold unit according to an operation signal of the servo motor. Injection mold apparatus characterized in that it further comprises a moving member spaced or spaced apart. The method of claim 2, The cooling die driving unit and the hydraulic device provided outside the second mold; And a cylinder member provided inside the accommodating part and connected to the cooling mold to contact or space the cooling mold to the second mold in response to an operation signal of the hydraulic device. The method of claim 1, The fine pattern of the stamper is an injection mold apparatus, characterized in that provided in a pattern corresponding to the dimple structure so that the structure formed on the surface of the injection molded product has a dimple structure. The method of claim 9, The stamper injection molding apparatus, characterized in that composed of a metal material. The method of claim 10, The stamper is an injection mold, characterized in that made of nickel (Ni). The method of claim 1, The temperature control device is injection molding apparatus characterized in that it is provided to raise the surface temperature of the stamper above the glass transition temperature of the resin flowing into the cavity. A stamper heating step of heating a stamper having a fine pattern formed between the first mold part and the second mold part; Moving the mold part in close contact with the first mold part and the second mold part such that a sealed cavity is formed between the first mold part and the second mold part; A resin inflow step of introducing molten resin into the first and second mold parts; A cooling step of cooling the first and second mold parts and the stamper after the resin inflow step is finished; And a mold part spaced apart step of spaced apart from the first and second mold parts to release the injection molded product. The method of claim 13, In the stamper heating step, the surface temperature of the stamper is increased above the glass transition temperature of the resin before the resin inflow step. The method of claim 13, The heating step of the stamper is performed by operating a heater embedded in the second mold portion to which the stamper is attached. The method of claim 13, The cooling step of the stamper is performed by contacting the cooling mold disposed to be spaced apart from the second mold portion and the second mold portion. A metal layer oxidation step of performing anodization on the metal layer deposited on the substrate to form a predetermined fine pattern on the metal layer; A voltage applying step of adjusting a size of a fine pattern by applying a predetermined voltage to the oxidized metal layer; An etching step of removing the oxide layer formed on the metal layer; Plating a predetermined metal layer on the pattern so as to form a stamper on which the fine pattern formed after removing the oxide layer is formed; And a stamper separating step of separating the stamper having the fine pattern formed thereon. The method of claim 15, And a voltage applied to the voltage applying step is locally applied differently according to the oxidized metal layer so that light appearing interfering by the fine pattern of the stamper is locally changed.

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