KR101707003B1 - The mold for manufacturing of soft contact lens - Google Patents

Abstract

The present invention relates to a mold for manufacturing a soft contact lens, and more particularly, to an upper mold having a plurality of pressing surfaces protruding downwardly; And a lower mold including a plurality of molding grooves drawn downward so as to form a cavity for molding a contact lens, the upper mold and the lower mold being formed in a rectangular shape, And a fixing protrusion for preventing rotation of the upper mold in a state where the upper mold and the lower mold are combined is provided at each corner of the upper surface.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold for manufacturing a soft contact lens,

The present invention relates to a mold for manufacturing a soft contact lens, and more particularly, to a mold for soft contact lens production for forming a contact lens having excellent optical performance by suppressing shift of an axis by relative movement of an upper mold and a lower mold, Mold.

2. Description of the Related Art [0002] In molding a contact lens, usually, a molding frame made of a male mold and a female mold is used in order to lower the manufacturing cost.

A contact portion abutting on the axial direction is formed at a portion corresponding to the peripheral edge portion of the contact lens between the male and female molds of the mold, and a contact portion is formed between the contact portion and the molding surface of the male and female molds. A cavity for lens molding is formed.

At this time, a molding material is filled in the cavity and the material is polymerized to obtain a contact lens.

On the other hand, when the cavity is formed by only one abutting portion, the male and female molds made of plastic move relatively in the radial direction due to the influence of heat generated when the molding material is polymerized, and the axes are shifted The optical performance of the contact lens is adversely affected, for example, the focus may deviate from the optical axis and eccentricity may occur.

When the contact lens having the eccentricity phenomenon is worn, a symptom such as a headache appears because a control function for correcting the optical axis shift acts on the human eye.

Also, conventionally, a mold for a contact lens in which at least one fitting portion is formed between both male and female molds has been proposed (Japanese Patent Publication No. 6-20761).

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a molding die according to the prior art; Fig.

The lens mold cavity 60 is formed between the male mold 40 and the molding surfaces 41 and 51 of the male mold 50 fitted in the axial direction A of the mold, 40 and 50 are formed on the outer edges of the molding surfaces 41 and 51 in an annular flat flat surface perpendicular to the axial direction A and closely contact with each other to keep the cavity 60 in a hermetic state The abutment surfaces 42 and 52 are formed.

In order to assure fitting of the two frames 40 and 50, the outer peripheral edges of the abutting faces 42 and 52 are provided with first vertical fitting portions 43 and 53 extending in the same direction as the axial direction A And a shoulder portion on the upper side of both the frames 40 and 50 on the outer side in the radial direction of the first fitting portions 43 and 53, 2 engaging portions 44 and 54 are formed.

At this time, the molding material for a contact lens is filled in the cavity 60, and the contact lens is molded by polymerizing the material with the molds 40 and 50 fitted at a predetermined pressure.

However, in the molding frame described above, relative movement of the male and female molds 40, 50 during molding of the contact lens can not be reliably prevented.

That is, the horizontal fitting portions 42 and 52 formed on the outer edges of the molding surfaces 41 and 51 of the both frames 40 and 50 are formed in a ring-shaped horizontal And between the first engaging portions 43 and 53 and the second engaging portions 44 and 54 which are formed in the same direction as the axial direction A, (40, 50) are in close contact with each other at the fitting surfaces (42, 52). Therefore, due to the influence of heat or the like generated when the molding material is polymerized, There is a case where the engaging portions 42, 52 move relative to each other in the range of the gap between the engaging portions 43, 53, 44, 54 along the engaging surfaces 42,

Therefore, the shafts of both the molds 40 and 50 can not be surely prevented from being displaced. In particular, when the heat polymerization is used, there is a problem that the shaft easily deviates due to thermal expansion.

Disclosure of the Invention The present invention has been devised to solve the problems described above, and it is an object of the present invention to provide a soft contact lens mold for molding a contact lens with excellent optical performance by suppressing shift of the shaft due to relative movement of the upper mold and the lower mold during contact lens molding .

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides an injection molding machine including an upper mold having a plurality of pressing surfaces protruding downward, and a plurality of molding grooves merged with the pressing surface and drawn downward to form a cavity for molding a contact lens Wherein the upper mold and the lower mold are formed in a rectangular shape, and at the corner of the upper surface of the lower mold, the upper mold and the lower mold are combined with each other to prevent rotation of the upper mold, A projection may be provided.

Preferably, the upper mold has a plurality of protruding fixing pins, and the upper surface of the lower mold has a plurality of pin holes for inserting the fixing pins, The upper mold may be inserted into the pin hole to prevent the upper mold from rotating at the upper portion of the lower mold.

Preferably, a cutout groove for easily separating the upper mold from the upper mold and the lower mold may be formed at one end and the other end of the upper mold.

Preferably, the upper mold and the lower mold may be made of polypropylene resin.

The present invention has an excellent effect in that when the contact lens is molded, the upper mold and the lower mold move relative to each other to prevent the axis from deviating, thereby forming a contact lens excellent in optical performance.

1 is a longitudinal sectional view showing a molding die according to the prior art.
2 is a perspective view showing a coupling relationship of a mold for manufacturing a soft contact lens according to an embodiment of the present invention.
Fig. 3 is a bottom perspective view of the upper mold shown in Fig. 1, and Fig. 4 is a perspective view of the lower mold shown in Fig.

The term used in the present invention is a general term that is widely used at present. However, in some cases, there is a term selected arbitrarily by the applicant. In this case, the term used in the present invention It is necessary to understand the meaning.

Hereinafter, the technical structure of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

3 is a bottom perspective view of the upper mold shown in Fig. 1. Fig. 4 is a cross-sectional view of the mold shown in Fig. 1, and Fig. And is a perspective view of the lower mold shown.

2 to 4, a mold 100 for manufacturing a soft contact lens according to an exemplary embodiment of the present invention includes an upper mold 110 having a plurality of pressing surfaces 111 protruding downward, And a lower mold 120 having a plurality of molding grooves 121 which are combined with the pressing surface 111 and are drawn downward so as to form a cavity for molding a contact lens.

In this case, the cavity is a space into which a molding liquid for manufacturing a contact lens is injected, and a contact lens having various shapes, sizes, and thicknesses may be manufactured according to the shape of the cavity.

3, the upper mold 110 protrudes downward. In the present embodiment, the upper mold 110 has a plurality of pressing surfaces 111, So as to have the five pressing surfaces 111 formed thereon.

The lower mold 120 is provided with a plurality of molding grooves 121 which are drawn downward. At this time, the molding grooves 121 are formed at positions opposed to the pressing surfaces 111, That is, five, that is,

As a result, the pressing surface 111 of the upper mold 110 and the molding groove 121 of the lower mold 120 are combined at a ratio of 1: 1 to form the cavity.

Meanwhile, in the mold 100 for manufacturing a soft contact lens according to an embodiment of the present invention, the upper mold 110 and the lower mold 120 are formed in a rectangular shape.

The reason why the upper mold 110 and the lower mold 120 are formed in a rectangular shape is that when the upper mold 110 and the lower mold 120 are combined, In order to easily identify with the naked eye.

Meanwhile, although the upper mold 110 and the lower mold 120 according to the embodiment of the present invention have been described as having a rectangular shape, the present invention is not limited thereto, and various polygons including a rectangular shape may be used. Of course, can be used.

In the mold 100 for manufacturing a soft contact lens according to an embodiment of the present invention, the upper mold 110 and the lower mold 120 are combined with each other at the corner of the upper surface of the lower mold 120, And fixing protrusions 122 for preventing rotation of the mold 110 are provided.

The fixing protrusion 122 is provided on the upper surface of the lower mold 120 in a state where the upper mold 110 and the lower mold 120 are combined with each other, So that the prevention of rotation of the upper mold 110 results in an improvement in the quality of the soft contact lens to be manufactured.

The mold 100 for manufacturing a soft contact lens according to an embodiment of the present invention includes a plurality of fixing pins 112 protruding from a lower surface of the upper mold 110, A plurality of pin holes 123 for inserting the respective fixing pins 112 are formed.

In this case, the fixing pin 112 and the pin hole 123 may be provided in an appropriate number as required. However, in the preferred embodiment of the present invention, as shown in FIGS. 3 and 4, 112 and a pin hole 123 are preferably formed and formed.

The reason why the fixing pin 112 is provided in the upper mold 110 and the pin hole 123 is formed in the lower mold 120 is similar to the fixing protrusion 122 described above.

That is, when the upper mold 110 and the lower mold 120 are combined, the fixing pin 112 is inserted into the pin hole 123, so that the upper mold 110 is positioned at the upper portion of the lower mold 120 So as to more firmly prevent rotation.

As a result, the mold 100 for manufacturing a soft contact lens according to an embodiment of the present invention is configured such that the upper mold 110 is fixed to the lower mold 110 by the fixing protrusions 122, the fixing pins 112, 120 from being rotated on the upper surface.

3, the mold 100 for manufacturing a soft contact lens according to an exemplary embodiment of the present invention includes the upper mold 110 and the lower mold 120, which are combined at one end and the other end of the upper mold 110, A cutout groove 113 for easily separating the upper mold 110 is formed.

At this time, the shape of the incision groove 113 is not limited to a specific shape and may be formed in various shapes, so that no particular limitation is given thereto.

In addition, the upper and lower molds of the mold 100 for manufacturing a soft contact lens according to an embodiment of the present invention may be made of various materials. In a preferred embodiment of the present invention, however, polypropylene, Resin is used.

As a result, the mold for manufacturing a soft contact lens according to one embodiment or the preferred embodiment of the present invention is capable of molding a contact lens having excellent optical performance by suppressing shift of the shaft due to relative movement of the upper mold and the lower mold through the above- Can have excellent effect.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the present invention. Various changes and modifications may be made by those skilled in the art.

100: mold for soft contact lens manufacturing
110: upper mold
111: Pressure face
112: Fixing pin
113: incision groove
120: Lower mold
121: forming groove
122: Fixing projection
123: pin hole

Claims (4)

A mold for soft contact lens manufacturing,
An upper mold having a plurality of pressing surfaces protruding downward; And
And a lower mold provided with a plurality of molding grooves drawn downward so as to form a cavity for molding the contact lens,
The upper mold and the lower mold are formed in a rectangular shape, and at the corner of the upper surface of the lower mold, in order to prevent rotation of the upper mold, A projection is provided,
Wherein a cutout groove for easily separating the upper mold from the upper mold and the lower mold is formed at one end and the other end of the upper mold.
The method according to claim 1,
Wherein a plurality of pin holes are formed on the lower surface of the upper mold and a plurality of pin holes are formed on the upper surface of the lower mold to insert the respective pins,
Wherein the fixing pin is inserted into the pin hole when the upper mold and the lower mold are combined to prevent the upper mold from rotating on the upper portion of the lower mold.
delete 3. The method according to claim 1 or 2,
Wherein the upper mold and the lower mold are made of polypropylene resin.

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