KR20170097829A

KR20170097829A - Heat Resistanced and Dimension Stabilized Barrel, Molding Device for Manufacturing of the Barrel and the barrel applied camera lens system

Info

Publication number: KR20170097829A
Application number: KR1020160019268A
Authority: KR
Inventors: 윤석일; 정민수; 이승진; 남승남; 김용제; 최용수
Original assignee: 주식회사 세코닉스; (주) 에스티씨 엔지니어링
Priority date: 2016-02-18
Filing date: 2016-02-18
Publication date: 2017-08-29

Abstract

The present invention relates to a barrel, a molding device for manufacturing the barrel, and a camera lens system having the barrel applied thereto. More specifically, the present invention relates to a molding device for manufacturing a barrel with enhanced heat resistance and dimensional stability, the barrel manufactured by the molding device, and a camera lens system having the barrel applied thereto. The molding device comprising upper and lower plates, upper and lower core plates which are formed on the upper and lower plates respectively, a plurality of upper and lower core pins which are formed on the upper and lower core plates respectively, and a cavity which is formed between the upper and lower core pins, and in which a material for molding of the barrel is injected, further comprises a temperature control unit which is formed within the lower core pin such that the lower core pin performs heat exchange with the material for molding of the barrel in the lower part of the cavity. The barrel comprises 25 to 35 wt% of a reinforcing material with respect to 100 wt% of a thermosetting resin including a cross-linking polymer or an amorphous polymer. Accordingly, the molding device of the present invention has an advantage of providing the barrel with enhanced heat resistance and dimensional stability which can be applied to a high pixel camera lens system by decreasing sensitivity according to temperature and securing dimensional stability.

Description

TECHNICAL FIELD [0001] The present invention relates to a barrel having improved heat resistance and dimensional stability, a mold apparatus for manufacturing the barrel, and a camera lens system employing the barrel.

The present invention relates to a mold apparatus for manufacturing a barrel and a barrel, and a camera lens system to which a barrel is applied. More particularly, the present invention relates to a camera lens system which can be applied to a camera lens system of a high- A barrel having enhanced dimensional stability, a mold apparatus for manufacturing the barrel, and a camera lens system to which the barrel is applied.

Recently, the use of mobile phone cameras and digital cameras has been increasing, and demands for diversification of required services, such as photographing, image transmission, or communication, have been intensified.

Particularly, in the lens system of a mobile phone camera, the demand for the mobile phone camera is getting stronger, and an expanded new concept mobile phone, a so-called camera phone or a camera mobile phone, which combines digital camera technology and mobile phone technology, And a camera module having an imaging device with a high megapixel or higher in accordance with a demand for high performance has been actively studied.

According to the requirements of the high-performance camera module, the sensitivity of the camera lens system varies greatly depending on the temperature. In particular, the thermal expansion, thermal deformation and coaxial deformation of the barrel, It will affect the degradation.

Therefore, the material characteristics and design of the barrel become important design factors.

In addition, it is necessary to apply FHD, 16MEGA, 20MEGA, and other high-resolution lens in HD class as a requirement of mobile phone camera lens that replaces existing digital camera due to increase of resolution of mobile phone camera lens.

This is due to the fact that, in addition to the designing technique for high resolution for achieving the enhancement of the resolving power of the lens, the processing technology of the lens mold, the material of the barrel for assembling the lens, and the design and manufacturing technology become more important.

On the other hand, such a barrel is generally manufactured by a mold apparatus, which includes an upper plate and a lower plate, an upper core plate and a lower core plate respectively formed on the upper plate and the lower plate, and an upper core plate and a lower core plate And a cavity formed between the upper core pin and the lower core pin and into which a material for forming the barrel is injected.

Here, depending on the shape of the barrel, a slide core for laterally machining the barrel may be further constructed.

1 and 2, six barrels are assembled by being inserted into a barrel. As shown in FIG. 2, the barrel 1 is a barrel, Similarly, from the lower side, the first lens to the sixth lens are sequentially assembled into the barrel to constitute a camera lens unit, and the barrel and the camera lens unit are collectively referred to as a camera lens system.

The barrel is manufactured by an injection molding machine. Generally, the barrel material injected by the hopper is melted and put into the cavity inside the barrel die device, and the barrel material is formed into a product through hardening or solidification process.

In the process of injection molding of such a barrel, the barrel is brought into contact with the upper core pin, where the first lens is located, on the basis of the final product, and the inside of the barrel in which the lenses are received is contacted by the lower core pin, And the curing or solidification process is performed by the base cooling.

However, in this case, since the lower core pin is formed in a cylindrical shape corresponding to the inner shape of the barrel, the internal latent heat is higher than other portions, so that the temperature deviation between the cavities is generated, So that the accuracy of the barrel is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a barrel having a structure that can be applied to a high-resolution camera lens system by securing a material for lowering the sensitivity of the barrel according to temperature, A barrel having enhanced heat resistance and dimensional stability, a mold apparatus for manufacturing the barrel, and a camera lens system to which the barrel is applied.

According to an aspect of the present invention, there is provided a plasma display panel comprising: an upper plate and a lower plate; an upper core plate and a lower core plate respectively formed on the upper plate and the lower plate; A barrel mold apparatus comprising a fin and a lower core pin, and a cavity formed between the upper core pin and the lower core pin and into which a material for forming a barrel is injected, the barrel mold apparatus comprising: And the temperature control means is formed inside the lower core pin so that heat exchange is performed between the lower core pin and the lower core pin, and a camera lens system to which the barrel manufactured by the method is applied. .

The present invention also provides a barrel having enhanced heat resistance and dimensional stability, characterized in that the reinforcing material is composed of 25 to 35 parts by weight of a polymer composed of a cross-linking polymer or an amorphous polymer. A mold apparatus for performing the above method is another technical point.

Here, it is preferable that the temperature control means is implemented as a temperature control flow path so that the temperature controlling fluid is drawn in and out of the lower core pin.

Further, the temperature adjusting means may include: an inlet pin formed in the lower core, the inlet pin having a temperature control fluid introduced thereinto; and a temperature regulating fluid supplied from the inlet pin moving along the inlet pin, It is preferable that the heat exchanger is implemented as a draw-out furnace for allowing heat exchange at the side portion and drawing the temperature controlling fluid to the outside.

In addition, the material for forming the barrel preferably includes a cross-linking polymer or an amorphous polymer, or a polymer blended therewith.

It is preferable that the material for forming the barrel is composed of 25 to 35 weight ratio of the reinforcing material to 100 weight ratio of the polymer.

Here, the reinforcing material may be any one of or a mixture of two or more of glass fibers (glads fiber), carbon fiber, glass beads, mineral beads, and polymer beads It is preferable to use them.

The crosslinked polymer may be any one of epoxy polymer, unsaturated polyester, polyimide, and phenolic polymer, or a mixture of two or more thereof .

The amorphous polymer may be any one of polycarbonate, polystyrene, polyacrylate, and copolymers thereof, or a mixture of two or more thereof.

The barrel according to the present invention has an effect of maintaining the heat resistance and dimensional stability in a use environment of a cellular phone, an external high temperature, a low temperature, a thermal shock, a vibration impact and the like.

In addition, the barrel mold apparatus according to the present invention is provided with temperature adjusting means below the cavity so as to minimize the influence of the temperature parameter, thereby minimizing the temperature deviation between the plurality of cavities, It is possible to secure the property.

In addition, the barrel according to the present invention can be applied to a camera lens system of a high-picture-area, because heat resistance and dimensional stability are ensured by a poor use environment of a mobile phone, an external temperature and an impact.

Figs. 1 and 2 are schematic views of a conventional camera lens system. Fig.
Figs. 3 and 4 are schematic views of an injection molding machine of a conventional barrel. Fig.
5 is a top schematic view of a main part of a barrel mold apparatus applied to an injection molding machine of a conventional barrel.
Fig. 6 is a side view schematically showing a main part of a barrel mold apparatus applied to an injection molding machine of a conventional barrel. Fig.
7 is a side view schematically showing a main part of a barrel mold apparatus according to an embodiment of the present invention;
FIG. 8 is a schematic view of a barrel mold apparatus manufactured according to an embodiment of the present invention, in which a temperature controlling means for a lower core pin is provided; FIG.
Figure 9 is a view showing the shape of a barrel made in a barrel mold apparatus having four cavities according to an embodiment of the present invention;
10 is a side view of a barrel manufactured in accordance with an embodiment of the present invention;
Figure 11 is a roundness diagram of a barrel manufactured in accordance with an embodiment of the present invention.
Fig. 12 is a view showing heat strain data according to an embodiment of the present invention ((a) a thermoplastic material, and (b) a thermosetting material).

[0001] The present invention relates to a barrel in which a plurality of lenses are inserted and assembled, and a barrel having enhanced heat resistance and dimensional stability, which can be applied to a camera lens system of a high- And a camera lens system to which the barrel is applied.

Particularly, the material for lowering the sensitivity according to the temperature of the barrel is secured, and the structure of the barrel mold apparatus in which dimensional stability is ensured is improved, so that it can be applied to a camera lens system of a high-pixel area.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 7 is a side view schematically illustrating a main part of a barrel mold apparatus according to an embodiment of the present invention. FIG. 8 is a barrel mold apparatus manufactured according to an embodiment of the present invention. FIG. 9 is a view showing a shape of a barrel manufactured in a barrel mold apparatus having four cavities according to an embodiment of the present invention, and FIG. FIG. 11 is a view showing roundness of a barrel manufactured according to an embodiment of the present invention, and FIG. 12 is a view showing the roundness of a barrel manufactured according to an embodiment of the present invention. ((A) a thermoplastic material, and (b) a thermosetting material).

1 and 2, a camera lens system according to the present invention includes a camera lens unit including a plurality of lenses, and a barrel into which the camera lens unit is inserted and assembled. The barrel protects the camera lens unit and is for aligning the optical axis of the lens with the air gap between the lenses.

2. Description of the Related Art In recent years, such a camera lens system has become more compact in order to achieve a resolution and a slimmer product of a high-resolution, high-precision hand-held camera, and the lens has an aspherical shape as shown in FIG.

As shown in FIG. 2, in order to match the resolution of an aspherical surface lens, particularly, to a resolution of a high pixel, six or more lenses are constituted, and the flow between the lenses and the air gap, the lens deformation, and the decenter are prevented A high-precision, characteristic stable barrel is required.

In the present invention, in order to secure the required characteristics of the barrel, it is necessary to use a material which maintains the heat resistance and dimensional stability in the use environment of the mobile phone, the high temperature, low temperature, thermal shock, do.

That is, by selecting a material for forming the barrel, sensitivity to temperature of the camera lens system is reduced, dimensional stability is secured, and a barrel applicable to a high-resolution camera lens system can be provided. Particularly, it improves the thermal expansion, thermal deformation and coaxiality according to the temperature of the barrel.

As a material for forming the barrel for securing such characteristics, it is preferable to use a cross-linking polymer, an amorphous polymer, or a polymer blended therein as a polymer.

As a material for forming the barrel, it is more preferable to use a reinforcing material at a weight ratio of 25 to 35 based on 100 weight of the polymer.

The reinforcing material is used for reinforcing the heat distortion temperature, the strength and hardness of the material, and may be a fiber such as glads fiber, carbon fiber, glass beads, mineral beads ) And polymer beads, or a mixture of two or more thereof.

The reinforcing material is preferably used in a weight ratio of 25 to 35 to the thermosetting resin in order to prevent the material for forming the barrel from protruding from the outside during injection molding without deteriorating the moldability.

The crosslinked polymer may be any one of epoxy polymer, unsaturated polyester, polyimide, and phenolic polymer, or a mixture of two or more thereof.

The amorphous polymer may be selected from the group consisting of polycarbonate, polystyrene, polyacrylate, and copolymers thereof, or a mixture of two or more thereof.

The characteristics of these materials are characterized by high heat distortion temperature, high temperature property stability, and low physical properties and dimensional changes due to temperature and humidity. In order to reinforce such heat distortion temperature, material strength and hardness, It is preferable to use them together as a reinforcing material.

On the other hand, in general, the dimensional accuracy of the barrel must satisfy the inner diameter dimension in which the lens is seated within a few microns. Therefore, in the present invention, the barrel is manufactured by the injection molding machine for such precision processing. The injection molding machine mainly uses equipment as shown in FIG. 3 and FIG. 4, and the material for molding the barrel injected by the hopper is melted and put into the cavity inside the barrel mold apparatus, and after hardening or solidification And is molded into a product.

FIG. 3 shows an injection molding machine using a conventional thermoplastic polymer. When a thermoplastic resin such as an amorphous polymer is used as a material for molding the barrel, The plastic pellet is injected into the hopper and is melted at a high temperature while being injected into the mold apparatus and molded into the final product while being plasticized at the screw of the injection molding machine.

FIG. 4 shows an injection molding machine using a conventional thermoset polymer. When a thermosetting resin such as a cross-linking polymer is used as a material for molding the barrel, Injected into a hopper, injected into a mold by a plunger, and molded into a final product by a curing process that takes place during the curing reaction.

Since a general polymer material has a crystalline or semi-crystalline structure, it is a material that can repeat melting and solidification according to the heating of the temperature. However, the characteristic of the thermosetting resin is that once it is melted by heating and solidified Since it is not melted again, a sophisticated technique for processing the material is required, and the barrel mold apparatus must ensure flatness and dimensional accuracy of about 1 to 2 microns, so special measures are required.

FIG. 5 is a schematic top view of a main part of a barrel mold apparatus applied to an injection molding machine of a conventional barrel, and FIG. 6 is a side view of a main part of a barrel mold apparatus applied to an injection molding machine of a conventional barrel.

Generally, a barrel mold apparatus includes an upper plate and a lower plate, an upper core plate and a lower core plate respectively formed on the upper plate and the lower plate, and a plurality of upper core pins and lower core plates formed on the upper core plate and the lower core plate, And a cavity formed between the upper core pin and the lower core pin and into which a material for forming the barrel is injected.

In particular, as shown in FIG. 7, a barrel mold apparatus for assuring flatness and dimensional accuracy of about 1 to 2 microns according to the present invention includes an upper plate and a lower plate, an upper core plate A plurality of upper core pins 40 and lower core pins 50 respectively formed on the upper core plate 10 and the lower core plate 20 and on the upper core plate 10 and the lower core plate 20, (40) and a lower core pin (50), wherein the cavity (30) is filled with a material for forming a barrel, characterized in that the barrel mold device And temperature adjusting means is formed inside the lower core pin 50 so that heat exchange with the material is performed. Here, depending on the shape of the barrel, a slide core for laterally machining the barrel may be further constructed.

The temperature adjusting means according to the present invention is basically a device for adjusting the temperature so as to minimize the influence of temperature variables in addition to being cooled or heated to the base from the mold apparatus, In order to solve the problem of latent heat remaining in the lower core pin.

That is, when a plurality of cavities are provided, the temperature control means according to the present invention is provided on each of the lower core pins 50 of each cavity, thereby minimizing the temperature deviation between the plurality of cavities, , And means for adjusting the temperature of the lower core pin (50) of the mold in order to ensure product quality.

For this purpose, a constant temperature control flow path is preferably provided in the lower core pin (50) so that the temperature controlling fluid is drawn and drawn into the lower core pin (50).

That is, the temperature controlling flow path is formed by supplying hot air or hot liquid to the injection molding material so as to smoothly fill the injection molding material, thereby lowering the injection pressure, And to minimize the occurrence of weld lines.

In addition, after the press-packing, cold air or cold liquid is supplied to lower the temperature inside the lower core pin 50 to strengthen the physical properties of the product, To be secured.

More specifically, as shown in FIG. 7, by such a temperature controlling means, the inlet pin 100, which is formed inside the lower core pin 50 and into which the temperature controlling fluid is drawn, And is configured as a drawer 200 for allowing the temperature control fluid supplied from the draw pin 100 to heat exchange at a lower portion of the cavity 30 and to draw the temperature controlling fluid to the outside As an example.

The temperature control fluid supplied from the inlet pin 100 flows along the outflow path 200 outside the inlet pin 100 to the lower side of the cavity 200, And the temperature control fluid is discharged to the outside along the outflow path 200 again after the heat exchange is performed so that an appropriate temperature is set in the cavity 30. [

FIG. 8 is a sectional view of a lower core pin according to an embodiment of the present invention. FIG. 8 is a cross-sectional view of a lower core pin according to an embodiment of the present invention. .

FIG. 9 illustrates a barrel manufactured in a barrel mold apparatus having four cavities according to an embodiment of the present invention, and FIG. 10 illustrates a side view of a barrel manufactured according to an embodiment of the present invention , The overall design of the barrel was satisfied and the roundness of the barrel was excellent.

FIG. 11 is a roundness diagram of a barrel manufactured in accordance with an embodiment of the present invention, showing roundness of a barrel of each cavity in a barrel mold apparatus having four cavities in total. As shown, the conventional barrel has a roundness of 8 mu m, but the present invention shows a remarkably improved effect to an average of 4 mu m.

12 is a view showing the thermal strain data according to an embodiment of the present invention, wherein (a) is a thermoplastic material, (b) is a thermosetting material, and The barrel is molded using a mold apparatus equipped with a temperature control means according to the present invention and applied to a camera lens system so that the positions 1 and 2 of the first lens SPL1 and the second lens SPL2, 2 was evaluated.

As shown in the figure, when the thermoplastic resin composition is somewhat used, the heat distortion rate is higher than that in the case of using the thermosetting resin composition, but it is judged that there is no hindrance to commercial use.

As described above, the barrel according to the present invention achieves resolution and product slimming of a high-resolution, high-precision cellular phone camera, and satisfies all the requirements for preventing flow between lenses, air gap, lens deformation, decenter, It is judged to be satisfied.

In addition, by selecting the material for forming the barrel, the sensitivity to the temperature of the camera lens system is improved to improve the characteristics such as thermal expansion, thermal deformation, coaxiality, dimensional stability and can be applied to a high- Thereby providing a barrel having a certain size.

In addition, the barrel mold apparatus according to the present invention is provided with temperature adjusting means below the cavity so as to minimize the influence of the temperature parameter, thereby minimizing the temperature deviation between the plurality of cavities, There is an advantage in securing the property.

10: upper core plate 20: lower core plate
30: cavity 40: upper core pin
50: lower core pin 100: inlet pin
200: With withdrawal route

Claims

An upper core plate and a lower core plate respectively formed on the upper plate and the lower plate, and a plurality of upper core pins and a lower core pin respectively formed on the upper core plate and the lower core plate, A barrel mold apparatus comprising a cavity formed between a fin and a lower core pin and into which a material for forming a barrel is injected,
And a temperature controlling means is formed inside the lower core pin so that heat exchange with the material for forming the barrel is performed in the lower cavity portion.

2. The apparatus according to claim 1,
Wherein the temperature control fluid is introduced into and withdrawn from the lower core pin through a temperature control flow path.

2. The apparatus according to claim 1,
An inlet pin formed in the lower core and through which a temperature controlling fluid is drawn;
And a draw-out groove formed around the draw-in pin to allow the temperature-controlling fluid supplied from the draw-in pin to heat-exchange at a lower portion of the cavity, and to draw the temperature-controlling fluid outwardly A mold apparatus for manufacturing a barrel having enhanced heat resistance and dimensional stability.

The barrel of claim 1, wherein the material for forming the barrel comprises:
A mold apparatus for manufacturing a barrel having enhanced heat resistance and dimensional stability, characterized by comprising a cross-linking polymer or an amorphous polymer or a polymer blended therewith.

The barrel of claim 4, wherein the material for forming the barrel comprises:
And a reinforcing material (25 to 35 weight ratio) based on 100 weight ratio of the polymer.

6. The reinforcing member according to claim 5,
Characterized in that any one or more of two or more of these materials is used in combination with one or more of glass fibers, carbon fibers, glass beads, mineral beads and polymer beads, And a mold apparatus for manufacturing a barrel having enhanced dimensional stability.

5. The crosslinked polymer according to claim 4,
Wherein one or more of an epoxy polymer, an unsaturated polyester, a polyimide, and a phenolic polymer is used or a mixture of two or more thereof is used, and heat resistance and dimensional stability are enhanced A mold apparatus for manufacturing a barrel.

5. The method of claim 4, wherein the amorphous polymer comprises:
The present invention relates to a method for producing a barrel having enhanced heat resistance and dimensional stability, which comprises using any one of a polycarbonate, a polystyrene, a polyacrylate and a copolymer thereof, A mold apparatus.

Characterized in that the reinforcing material is composed of 25 to 35 parts by weight of a polymer comprising 100 parts by weight of a polymer consisting of a cross-linking polymer or an amorphous polymer.

The method according to claim 9, wherein the cross-
Wherein one or more of an epoxy polymer, an unsaturated polyester, a polyimide, and a phenolic polymer is used or a mixture of two or more thereof is used, and heat resistance and dimensional stability are enhanced Barrel.

10. The method of claim 9, wherein the amorphous polymer comprises:
A barrel having enhanced heat resistance and dimensional stability, characterized in that any one or a mixture of two or more of polycarbonate, polystyrene, polyacrylate and copolymers thereof is used.

10. The reinforcing member according to claim 9,
Characterized in that any one or more of two or more of these materials is used in combination with one or more of glass fibers, carbon fibers, glass beads, mineral beads and polymer beads, And barrel with enhanced dimensional stability.

A camera lens system using the barrel of any one of claims 9 to 12.