KR102025430B1 - Lens molding apparatus using the weight increasing the thermal efficiency - Google Patents

Abstract

A plate, a molded part for forming a lens molding on the plate, and an upper part of the molded part, applied to the molded part, a load having a rod through-hole, and spaced apart from the upper part of the load, The present invention relates to a lens forming apparatus using a load having increased thermal efficiency, including an upper heater constituting a heater rod through a hole to apply high temperature heat to a molding portion.
Lens forming apparatus using a load with improved thermal efficiency according to the present invention can be molded by pressing the lens molding through the load of the load portion rather than the pressing method using a conventional press to reduce damage to the core and the lens, and to extend the life, In addition, the heat added during lens molding through the heater rod facilitates the melting of the lens molding, and thus has a remarkable effect of easily performing the process.

Description

LENS MOLDING APPARATUS USING THE WEIGHT INCREASING THE THERMAL EFFICIENCY}

The present invention relates to a lens forming apparatus using a load having a high thermal efficiency for molding the lens molded by using the load of the load portion to reduce damage to the core and the lens and extend the life of the core.

In addition, the present invention relates to a lens forming apparatus using a load with increased thermal efficiency that can be easily performed by increasing the thermal efficiency through the heater rod.

In general, the aspherical lens is capable of aspherical surface processing on hard brittle materials such as cemented carbides due to the development of ultra-precision processing, and it is possible to produce aspherical lenses having small shape errors in a short time.

As a method of forming a conventional aspherical lens, the glass exhibits a property of softening the material while exceeding the transition temperature (Tg). At this time, a pressing technique is applied to the core to form the core to be copied onto the glass. This is called a glass mold press method (GMP).

Glass exhibits a significant change in physical properties above the transition temperature (Tg), and the molding apparatus performs a plurality of heating process steps, a press step, and a plurality of cooling steps in a single chamber because the difference in physical properties according to the heating and cooling speeds is different.

However, the conventional GMP method has a limit that can not reduce the time required to produce the product to a certain time or less in order to prevent the process stress of the glass material.

In the conventional GMP method, since a high-pressure press is applied in a glass transition temperature state, a lot of stress is applied to the glass material, and thus the degree of deformation of the physical property of the glass material is increased even though the cooling is gradually performed.

In addition, the conventional GMP method is subjected to a high-pressure press in a short time can be damaged by a large impact on the core. That is, the life of the core can be reduced by frequent heat changes and high pressure presses.

As such a lens molding apparatus using a GMP method, Korean Patent Publication No. 1739760 discloses an automated apparatus for manufacturing aspherical lenses that can automate the manufacturing process of aspherical lenses with a plurality of cavities.

Prior art 1 described above performs a press operation for molding a lens through a pressing means to a mold put into a press molding machine. Accordingly, there is still a problem that the mold may be damaged because a high pressure press is applied to the mold in a short time. That is, the mold is damaged by frequent heat changes and high pressure presses, which may reduce the life of the mold.

Therefore, there is a need to develop a lens molding apparatus that can extend the life of the molding core while reducing the molding stress of the glass material.

Domestic registration publication No. 1739760 (2016.01.19.)

In order to meet the above requirements, an object of the present invention is to form a lens molding using the load of the load portion to reduce the damage to the core and the lens and to extend the life of the lens lens molding using a heat-efficient load To provide a device.

In addition, an object of the present invention is to provide a lens forming apparatus using a load with a high thermal efficiency to easily perform the process to facilitate the melting of the lens molding to increase the thermal efficiency due to the heat added during lens molding through the heater rod.

Various problems to be solved by the present invention are not limited to the above-mentioned problems, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, the lens molding apparatus using the load with the improved thermal efficiency according to the present invention is formed on the plate 100, the plate 100 and the molding part 1000 for molding the lens molding (G) and And a load part 600 disposed on an upper part of the molding part 1000 to apply a load to the molding part, wherein the molding part 1000 is disposed on the plate 100 and through the plate 100. The lower core 200 that applies the received high temperature heat to the lens molding G, and is disposed above the lower core 200, is lowered by the load part 610 to thereby reduce the lens molding G. Consists of the upper core 400 for pressing, the load portion 600 is a ring-shaped stop ring 620 for receiving the load 610 to apply a load to the forming portion 1000 and the forming portion 1000 In the molding apparatus comprising a), the load portion 600, the lens molding (G) is the transition temperature It is possible to press the upper core 400 to reach the lens before reaching the stop ring 620 of the load portion 600 is the upper core 400 is lowered while pressing the lens molding (G) under the load It is formed to a height to be able to press-molding the lens molding (G), the upper core 400 is to press the lens molding (G) by the weight of the load portion 600, the upper heater 400 Is provided with a heater rod 710 spaced apart from the upper portion of the load 610, penetrates the rod through hole 600H of the load 610 to apply a high temperature heat to the forming portion 1000. It is characterized by.

In addition, the molding unit is disposed on the plate, the lower core for applying a high temperature heat transmitted through the plate to the lens molding; An upper core disposed on the lower core and lowered by the load part to press the lens molding; A sleeve disposed between the lower core and the upper core and having a sleeve through-hole which is a space for molding the lens molding; And a holder formed with a holder through-hole, which is a space for accommodating the lower core and the upper core. The lower core, the sleeve, and the upper core may be positioned on the same axis by the holder.
That is, further comprising a holder 500 formed with a holder through-hole 500H for receiving the lower core 200 and the upper core 400, the lower core 200, the sleeve 300 by the holder 500 ) And the upper core 400 are located on the same axis, the holder through-hole 500H is characterized in that arranged on the circumference around the heater rod (710).

In addition, the heater rod is characterized in that formed in contact with the upper side of the holder.

In addition, the inner diameter of the rod through hole is formed larger than the outer diameter of the heater rod.

The apparatus may further include a ring-shaped stop ring disposed below the load and accommodating the molded part, and the load and the stop ring may be attached and detached.

In addition, various effects of the technical features of the present invention will be added to the detailed description.

The present invention can be molded by pressing the lens molding through the load of the load portion rather than the pressing method using a conventional press to reduce damage to the core and the lens, and to extend the life.

In addition, the present invention can easily perform the process to facilitate the melting of the lens molding to increase the thermal efficiency due to the heat added during the lens molding through the heater rod.

In addition, the present invention can reduce the defective rate and can form a plurality of lenses to increase the yield.

1 is an exploded perspective view schematically showing a lens forming apparatus using a load with increased thermal efficiency according to an embodiment of the present invention.
Figure 2 is a longitudinal sectional view schematically showing a lens forming apparatus using a load with increased thermal efficiency according to an embodiment of the present invention.
3A to 3C are schematic views illustrating a load unit according to various embodiments of the present disclosure.
4 is a flowchart illustrating a lens molding method using a lens molding apparatus using a load having a higher thermal efficiency according to an embodiment of the present invention.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Accordingly, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, various modifications that can be substituted for them at the time of the present application It should be understood that there may be equivalents and variations.

Before describing the present invention with reference to the drawings, it is not shown or specifically described for the components that are not necessary to reveal the gist of the present invention, that is, those skilled in the art can obviously add. Make a note.

Like reference numerals refer to like elements throughout the specification. Thus, the same reference numerals or similar reference numerals may be described with reference to other drawings even if they are not mentioned or described in the corresponding drawings.

1 is an exploded perspective view schematically showing a lens forming apparatus using a load with increased thermal efficiency according to an embodiment of the present invention, Figure 2 is a lens forming apparatus using a load with increased thermal efficiency according to an embodiment of the present invention It is a longitudinal sectional view schematically showing.

1 and 2, a lens forming apparatus using a load according to an embodiment of the present invention may include a plate 100, a molding part 1000, a load part 600, and an upper heater 700. have.

The plate 100 may be disposed closely to the lower heater (not shown) and may transmit high temperature heat to the lower core 200, and may support the molding part 1000. The plate 100 may include a lift hole 101 penetrating the upper surface from the bottom surface of the plate 100. When the molding of the lens molding G is completed, a lift pin (not shown) is lifted up to the plate 100 through the lift hole 101 to discharge the lens. Thereby, the molding part 1000 can be dropped from the plate 100. Plate 100 may be provided with a projection (D) coupled to the holder 500 to be described later.

The molding part 1000 may include a lower core 200, a sleeve 300, an upper core 400, and a holder 500 in a configuration for molding the lens molding G. Here, the material of the molding part 1000 may be made of cemented carbide in consideration of the expansion coefficient according to the applied pressure and temperature.

The lower core 200 may be disposed on the plate 100 and may include a seating groove 201 for seating the lens molding G. Thus, the lens molding G may be seated in the seating groove 201 together with the barrel 30. The lower core 200 applies the high temperature heat transmitted through the plate 100 to the lens molding G to be melted.

The sleeve 300 may be disposed between the lower core 200 and the upper core 400, and may have a sleeve through-hole 301 which is a space for forming the lens molding G.

The upper core 400 may be disposed on the upper portion of the lower core 200, and may be lowered by the load unit 600 to press the lens molding G. The upper core 400 may include a lens pressing unit 401 inserted into the sleeve through-hole 301 to press the lens molding G.

According to design conditions, the lens pressing unit 401 may be included in any one or both of the lower core 200 and the upper core 400.

According to such a configuration, the lower core 200, the sleeve 300, and the upper core 400 are composed of unit assemblies, so that the cores can be easily replaced and assembled, and the lenses having various curved surfaces can be manufactured by only replacing each core. .

The holder 500 is disposed on the plate 100 and may include a holder through hole 500H, which is a space for accommodating the lower core 200, the sleeve 300, and the upper core 400. The holder 500 allows the lower core 200, the sleeve 300, and the upper core 400 to be located on the same axis.

The holder 500 may be formed to be in close contact with the outer circumferential surfaces of the lower core 200, the sleeve 300, and the upper core 400. Accordingly, the inner diameter of the holder 500 may be the same as the outer diameter of the lower core 200, the sleeve 300, and the upper core 400.

In addition, the holder 500 may include a plurality of holder through holes 500H. Accordingly, a unit assembly of the plurality of lower cores 200, the sleeve 300, and the upper core 400 may be formed. Holder 500 may be provided with a locking groove 503 of the 'D' cut shape to be seated in accordance with the projection (D) of the plate (100).

In addition, the holder 500 may include a plurality of holder outlets 501 formed on the side surface. The holder outlet 501 may discharge the combustion gas generated in the process of forming the lens molding G to the outside.

The load part 600 may be disposed above the molding part 1000 and may apply a load to the molding part 1000 to mold the lens.

The load unit 600 may include a load 610 for applying a load to the center of the load and a ring-shaped stop ring 620 for receiving the molding unit 1000. The outer diameter of the load unit 600 may be the same as or larger than the outer diameter of the plate 100.

The load 610 may include a rod through hole 610H through which the heater rod 710 to be described later passes. The inner diameter of the rod through hole 610H may be slightly larger than the outer diameter of the heater rod 710. That is, the rod through hole 610H may have an inner diameter that the heater rod 710 can penetrate so that the heater rod 710 does not participate in the load and the heater rod 710 does not touch the inner wall. The load 610 may be formed to a height within 60% of the overall height from the plate 100 to the load 610.

The load 610 may have a mass-specific mass (g) of 150 or more and less than 500 when the diameter is Φ28.4 as a weight for the load.

If the mass (g) of the load 610 is less than 150, the degree of the pressurized load is weak and lens molding may cause a defect. That is, since the force pressurized by the molten lens molding (G) is small, the lens shaping is not performed properly, thereby increasing the probability of defective lens shaping.

When the mass (g) of the load 610 is 500 or more, the degree of the pressurized load is strong and lens molding may cause a defect. That is, since the force pressurized by the molten lens molding G is large, the physical property change of the lens molding G may be large, and the stress may be high.

The stop ring 620 may be formed at a height capable of descending by pressing the upper core 400 under a load. That is, the height of the stop ring 620 may be a height to prevent the lens from being lowered further to a height at which the lens can be molded.

The stop ring 620 may include a gas outlet 621 formed on the side surface. At least one gas outlet 621 may communicate with each other to discharge combustion gas generated in the process of forming the lens molding G to the outside.

The load 610 and the stop ring 620 may be integrally formed. The load 610 and the stop ring 620 may be integrally formed. The load part 610 is formed by integrally forming the load 610 and the stop ring 620, the load of the stop ring 620 is added to the upper core 400 even if the load of the load 610 itself is reduced The load applied to the load may be applied more than when pressurized only by the load 610. Therefore, even if they have the same diameter, in consideration of the weight of the stop ring 620, the weight of the load 610 can be easily adjusted to the thickness of the load 610 according to the design conditions. Furthermore, the load 610 and the stop ring 620 during the process may be attached and detached according to the process conditions.

Accordingly, damage to the lower core 200 and the upper core 400 may be reduced by reducing molding stress of the lens molding G and dispersing pressure applied to the core.

The upper heater 700 is spaced apart from the upper portion of the load portion, and may include a heating element for applying high temperature heat. Here, the heating element may be made of any one of a plate-shaped metal heater, a plate-shaped ceramic heater, a coil and the like. In addition, any heating element capable of generating heat may be employed.

The upper heater 700 may include a heater rod 710 for applying high temperature heat to the molding part. The heater rod 710 may be made of metal, and any material that may transfer heat may be adopted.

The heater rod 710 may be formed to be in contact with the upper side of the holder 500 through the rod through hole (610H). Accordingly, when the lens is molded, high temperature heat may be applied to the molding part 1000 so that the lens molding G is melted, thereby improving thermal efficiency. Thus, the process can be made easier.

In conclusion, the lens forming apparatus using the load with the improved thermal efficiency of the present invention is formed by pressing the lens molding G using a conventional press through the load of the load part 600 by the lower core 200 and the upper core. It is possible to reduce damage to the 400 and the lens and to extend the life of the cores.

In addition, the lens molding apparatus may easily perform the process by easily melting the lens molding (G) by increasing the thermal efficiency due to the heat added during the lens molding through the heater rod 710.

In addition, the lens forming apparatus can reduce the defect rate and can form a plurality of lenses to increase the yield.

3A to 3C are schematic views illustrating a load unit according to various embodiments of the present disclosure.

1, 2 and 3A, the load portion 600 that can be attached and detached may include a load 610 and a stop ring 620.

The load 610 may apply a load to the upper core 400 as a center of the load. One or more coupling grooves 611 may be provided on an upper surface of the load 610.

The stop ring 620 may be formed in a ring shape and may accommodate the molding part 1000. The bolt 10 penetrates through the coupling groove 611 in contact with the lower surface of the load 610 and may be coupled to the load 610.

The inner diameter of the stop ring 620 may be larger than the outer diameter of the holder 500 with the same or a slight tolerance as the outer diameter of the holder 500.

Thereby, the stop ring 620 can be detached and attached from the load 610 easily according to the process conditions.

1, 2 and 3b, the load portion 600 that can be attached and detached may include a load 610 and the stop ring 620.

The load 610 may apply a load to the upper core 400 as a center of the load. The lower surface of the load 610 may be configured to include a load protrusion 613 formed with a screw thread for coupling with the stop ring 620.

The stop ring 620 may be formed in a ring shape and may accommodate the molding part 1000. The upper inner side of the stop ring 620 may be formed with a screw groove 623 for coupling with the load protrusion 613. Thus, the load 610 and the stop ring 620 may be coupled by screwing. The inner diameter of the stop ring 620 may be larger than the outer diameter of the holder 500 with the same or a slight tolerance as the outer diameter of the holder 500.

Thereby, the stop ring 620 can be detached and attached from the load 610 easily according to the process conditions.

1, 2 and 3C, the load portion 600 that can be attached and detached may include a load 610 and a stop ring 620.

The load 610 may apply a load to the upper core 400 as a center of the load. The load 610 may be configured to include one or more engaging portion 615 on one side in order to couple with the stop ring 620.

Stop ring 620 The stop ring 620 may be formed in a ring shape and accommodate the molding part 1000. The stop ring 620 may be configured to include one or more locking projections 625 corresponding to the locking portion 615 to couple with the load 610. The combined locking protrusion 625 may be sealed through the locking rod 20 so that the locking portion 615 of the load 610 does not fall out.

The inner diameter of the stop ring 620 may be larger than the outer diameter of the holder 500 with the same or a slight tolerance as the outer diameter of the holder 500.

Thereby, the stop ring 620 can be detached and attached from the load 610 easily according to the process conditions.

4 is a flowchart illustrating a lens molding method using a lens molding apparatus using a load having a higher thermal efficiency according to an embodiment of the present invention.

With reference to FIGS. 1, 2 and 4, a method of molding a lens using a lens forming apparatus using a load having a higher thermal efficiency will be described.

The lens forming apparatus using a load having a high thermal efficiency seats a holder 500 having a plurality of holder through holes 500H formed on a plate 100, and has a lower core 200, a sleeve 300, and a barrel, which are a unit assembly set. The lens molding G inserted into the 30 and the upper core 400 are assembled (S1), and high temperature heat is applied to the molding part 1000 assembled on the plate 100 through a lower heater (not shown). It may be applied to heat the molding unit 1000 (S2). In this case, heating is performed in four steps, and the same high temperature is applied to the molding part 1000 in all four heating steps. The molding part 1000 is heated until the second step of heating, and molding is performed while the lens molding G exceeds the transition temperature in the third step of heating. In the heating step S2, the load part 600 is disposed above the molding part 1000. The load unit 600 may apply a load to the upper core 400. That is, the upper core 400 to which the load is applied may pressurize the lens molding G before the transition temperature is reached.

In addition, in the heating step S2, the heater rod 710 of the upper heater 700 passes through the rod through hole 610H of the load 610 to be in contact with the upper side of the holder 500.

The high temperature heat is not applied to the molding part 1000 in which the lens molding is completed after the four steps of heating, and the molding part 1000 is cooled (S3). Cooling may be performed in two stages, and at this time, the load part 600 may be disposed on the molding part 1000 to apply a load to the upper core 400. After the second step of cooling, the load unit 600 is disposed in a separate position, and the molding unit 1000 is separated (S4) to discharge the molded lens.

Accordingly, the present invention can improve the quality of the lens by minimizing the deformation of the material for each process time due to the load of the load portion 600 before the lens molding (G) reaches the transition temperature.

In addition, by reducing the rapid pressure change of the cores, it is possible to reduce the damage of the cores and to prolong the life.

In addition, the heater rod 710 increases the thermal efficiency to facilitate the melting of the lens molding (G) to facilitate the process.

1 to 4 describe only the main matters of the present invention, and it is obvious that the present invention is not limited to the configuration of FIGS. 1 to 4 as long as various designs are possible within the technical scope. Do.

100: plate D: projection
200: lower core 201: seating groove
300: sleeve 301: sleeve through hole
400: upper core 401: lens pressing unit
500: holder 500H: holder through hole
501: holder outlet 503: locking groove
610: load 610H: rod through hole
611: coupling groove 613: load through hole
615: engaging portion 620: stop ring
621: gas outlet 623: screw groove
625: locking projection G: lens molding
30: barrel 10: bolt
20: locking rod 700: upper heater
710: heater rod

Claims (5)

Plate 100,
A molding part 1000 disposed on the plate 100 and molding a lens molding G;
It is disposed on the upper part of the molding part 1000 and includes a load part 600 for applying a load to the molding part,
The molding part 1000,
A lower core 200 disposed on the plate 100 to apply high-temperature heat received through the plate 100 to the lens molding G;
Is disposed on the upper portion of the lower core 200, the lower portion by the load 600 is made of an upper core 400 for pressing the lens molding (G),
In the lens forming apparatus, the load part 600 includes a load 610 for applying a load to the molding part 1000 and a ring-shaped stop ring 620 for receiving the molding part 1000.
The load unit 600 is able to press the upper core 400 before the lens molding (G) reaches the transition temperature to form a lens,
The stop ring 620 of the load part 600 is formed to a height at which the upper core 400 descends while pressing the lens molding G under load, so that the lens molding G can be press-molded,
The upper core 400 is to press the lens molding (G) by the weight of the load portion 600,
The upper heater 700,
The heater rod 710 is spaced apart from the upper portion of the load 610 and penetrates through the rod through hole 600H of the load 610 to apply high temperature heat to the molding part 1000. Made,
Lens forming apparatus using a load with high thermal efficiency. The method of claim 1,
Further comprising a holder 500 formed with a holder through-hole 500H for receiving the lower core 200 and the upper core 400,
The lower core 200, the sleeve 300 and the upper core 400 are positioned on the same axis by the holder 500.
The holder through-hole 500H is characterized in that arranged on the circumference around the heater rod 710,
Lens forming apparatus using a load with high thermal efficiency. The method of claim 2,
The heater rod 710 is,
Characterized in that the contact with the upper portion of the holder 500,
Lens forming apparatus using a load with high thermal efficiency. delete delete

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