KR101703986B1 - Apparatus for molding of contact lens - Google Patents

Apparatus for molding of contact lens Download PDF

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Publication number
KR101703986B1
KR101703986B1 KR1020150051086A KR20150051086A KR101703986B1 KR 101703986 B1 KR101703986 B1 KR 101703986B1 KR 1020150051086 A KR1020150051086 A KR 1020150051086A KR 20150051086 A KR20150051086 A KR 20150051086A KR 101703986 B1 KR101703986 B1 KR 101703986B1
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KR
South Korea
Prior art keywords
mold
upper mold
lens
lower mold
contact lens
Prior art date
Application number
KR1020150051086A
Other languages
Korean (ko)
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KR20160121277A (en
Inventor
조동하
Original Assignee
주식회사 매직콘
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Filing date
Publication date
Application filed by 주식회사 매직콘 filed Critical 주식회사 매직콘
Priority to KR1020150051086A priority Critical patent/KR101703986B1/en
Publication of KR20160121277A publication Critical patent/KR20160121277A/en
Application granted granted Critical
Publication of KR101703986B1 publication Critical patent/KR101703986B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B29D11/00125—Auxiliary operations, e.g. removing oxygen from the mould, conveying moulds from a storage to the production line in an inert atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B29D11/00125—Auxiliary operations, e.g. removing oxygen from the mould, conveying moulds from a storage to the production line in an inert atmosphere
    • B29D11/00173—Conveying moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/0048—Moulds for lenses

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The present invention relates to a contact lens molding apparatus, and includes a rotating plate, a lens liquid input portion, a first pressing portion, and a second pressing portion. The rotary plate has a plurality of holes along an outer circumferential surface thereof, and a lower mold supplied from the lower mold supply unit is seated while rotating at constant intervals. The lens liquid injecting portion injects the lens liquid into the lower moles that are seated on the rotary plate. In the first pressing portion, the upper mold supplied from the upper mold supply portion is seated on the lower mold into which the lens liquid is injected, and the lens mold formed between the lower mold and the upper mold is pressed by pressing the upper mold to form a coupling mold. The second squeezing portion presses the upper surface of the mating mold to perform secondary squeezing so that the lens liquid spreads uniformly.
According to the present invention, a contact lens having a uniform thickness and excellent surface uniformity can be formed by bonding an upper mold and a lower mold provided with a lens liquid to form an engagement mold, and then re-pressurizing the engagement mold. The upper mold is automatically injected so as to maintain a certain direction to prevent dust and the like from being attached to the lower mold and the upper mold to increase the molding performance of the contact lens and shorten the molding time to improve the production capacity.

Description

[0001] Apparatus for molding contact lenses [0002]

The present invention relates to a contact lens molding apparatus, and more particularly, to a contact lens molding apparatus capable of precisely molding a contact lens with a uniform thickness.

Contact lenses are used to correct vision by refracting light in close contact with the corneal surface of the eye. Therefore, the contact lens should be formed of a flexible material that does not damage the cornea while being closely attached to the cornea, so that the wearer can comfortably wear it.

As a feature of the contact lens, it is worn in a state of being directly fixed to the cornea, so that arbitrary change due to the difference in temperature and humidity hardly occurs, there is no action of the prism, the magnification difference of the image is small, Since it is possible to correct irregular astigmatism, it has excellent optical characteristics compared to ordinary glasses.

The contact lens forming apparatus generally employs a method of molding a contact lens having flexibility and elasticity by pressing and firing a liquid lens liquid. The contact lens forming apparatus may include a pressing part, an upper mold, and a lower mold, and the lens liquid provided between the upper mold and the lower mold is pressed against the upper mold by the pressing part, Can be molded.

At this time, in order to form a contact lens having a constant thickness, it is required to press the upper mold at a uniform pressure. When the upper mold is simply pressed, the upper mold and the lower mold can not maintain a firmly coupled shape, and uniform pressure is not applied to the lens liquid provided between the upper mold and the lower mold, so that a contact lens having irregular thickness can be formed .

The cleanliness of the upper mold and the lower mold when the upper mold and the lower mold are put into the contact lens molding apparatus is one of the important factors. That is, the upper mold and the lower mold must be charged so as to maintain a constant directionality, and when the work is processed by the gravitational force, the working speed is lowered, and when the attachment of foreign matter such as dust is buried in the upper mold and the lower mold, The surface precision of the lens may be reduced. The contact lens manufactured in this manner can cause the user's eyes to become congested when worn, making the wearer feel fatigued and can lower the value of the contact lens product.

Korean Patent Laid-Open Publication No. 2003-7015402 discloses a center contact method and apparatus for contact lens molding. Korean Patent Laid-Open Publication No. 2003-7015402 discloses a method and apparatus for center contact for molding a contact lens, wherein the upper mold and the lower mold are firmly coupled if there is a side that is difficult to insert the upper mold and the lower mold at a predetermined position, It is difficult to form a contact lens of one thickness.

An object of the present invention is to provide a contact lens forming apparatus capable of forming a contact lens mold for bonding an upper mold and a lower mold provided with a lens liquid and for molding a contact lens having a uniform thickness and excellent surface uniformity by re- .

Another object of the present invention is to provide a method for manufacturing a contact lens which is capable of automatically molding a lower mold and an upper mold so as to keep the same in a certain direction to prevent dust and the like from adhering to the lower mold and the upper mold, And to provide a contact lens molding apparatus capable of improving the ability.

In order to achieve the above object, a contact lens molding apparatus according to an embodiment of the present invention includes a rotating plate, a lens liquid injecting portion, a first pressing portion, and a second pressing portion. The rotary plate has a plurality of holes along an outer circumferential surface thereof, and a lower mold supplied from the lower mold supply unit is seated while rotating at constant intervals. The lens liquid injecting portion injects the lens liquid into the lower moles that are seated on the rotary plate. In the first pressing portion, the upper mold supplied from the upper mold supply portion is seated on the lower mold into which the lens liquid is injected, and the lens mold formed between the lower mold and the upper mold is pressed by pressing the upper mold to form a coupling mold. The second squeezing portion presses the upper surface of the mating mold to perform secondary squeezing so that the lens liquid spreads uniformly.

The first squeeze portion of the contact lens molding apparatus according to the embodiment of the present invention may have an air inlet at the end for pressing the upper mold. The first squeeze portion can be coupled to the lower mold by moving the upper mold through the air inlet and then moving the lens mold to the lower mold into which the lens liquid is injected.

The upper mold supply part of the contact lens molding apparatus according to the embodiment of the present invention is formed in a cylindrical shape and has a guide formed on the upper surface of the cylindrical shape to prevent the upper mold from falling to the outside, And a second linear guide portion formed to surround the upper mold supply portion in a spiral shape at the discharge port and a second linear guide portion formed to be inclined from the end of the second spiral guide portion toward the hole.

The contact lens molding apparatus according to an embodiment of the present invention may further include a discharge unit. The discharge portion can separate the coupling mold pressed by the second pressing portion from the hole.

The contact lens molding apparatus according to an embodiment of the present invention may include a second rotary plate. The second rotary plate has a perforation hole formed at the center thereof, and may be arranged to be coplanar with the rotary plate. The second rotary plate can transfer the coupling mold separated from the hole to the firing portion through the discharge portion.

The contact lens molding apparatus according to the present invention can mold a contact lens having a uniform thickness and excellent surface uniformity by bonding an upper mold and a lower mold provided with a lens liquid to form an engagement mold and then re- .

In addition, the contact lens molding apparatus according to the present invention can automatically insert the lower mold and the upper mold so as to maintain a predetermined direction, thereby preventing the lower mold and the upper mold from being contaminated with dust and the like, thereby increasing the molding performance of the contact lens, The time can be shortened and the production capacity can be improved.

1 is a contact lens molding apparatus according to an embodiment of the present invention.
2 is a detailed view of an upper mold and a lower mold of a contact lens according to an embodiment of the present invention.
3 is a flowchart of a contact lens forming process of a contact lens molding apparatus according to an embodiment of the present invention.
4 is a photograph of a lower mold supply part of the contact lens molding apparatus according to an embodiment of the present invention.
5A and 5B are partial detail views of a lower mold supply portion of a contact lens molding apparatus according to an embodiment of the present invention.
6 is a photograph of an upper mold supply part of the contact lens molding apparatus according to an embodiment of the present invention.
7 is a detailed view of a discharge portion of a contact lens molding apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

Also, throughout the specification, when an element is referred to as "including" an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. Also, throughout the specification, the term "on " means to be located above or below a target portion, and does not necessarily mean that the target portion is located on the upper side with respect to the gravitational direction.

FIG. 2 is a detailed view of an upper mold and a lower mold of a contact lens according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of an embodiment of the present invention Fig. 5 is a flowchart of a contact lens forming process of the contact lens forming apparatus according to the first embodiment.

1 to 3, an automatic contact lens apparatus according to an embodiment of the present invention includes a rotating plate 100, a lens liquid injecting unit 200, a first pressing unit 300, a second pressing unit 400 and an outlet 500.

The rotary plate 100 has a disk shape, and a plurality of holes 110 are formed at regular intervals along the outer peripheral surface. It is preferable that the hole 110 is formed as a long hole toward the center axis from the outer periphery of the rotary plate so that the lower mold 10 is completely inserted into the long hole so that the lower mold 10 can be firmly supported without shaking . The rotating plate 100 can rotate clockwise or counterclockwise by a rotating motor (not shown) or the like, but in the present embodiment, the rotating plate 100 will be mainly described as rotating counterclockwise.

The lower mold 10 is formed in a cylindrical shape and the outer diameter of the lower mold 10 is formed to be the same as the diameter of the hole 110 and inserted into the hole 110. In addition, the lower mold may be inserted into the hole 110 to form a first horizontal protruding surface 12 at the upper end thereof. It is preferable that the lower portion of the inner circumferential surface of the lower mold 10 is formed as a concave groove 11 so as to form a spherical shape of the contact lens.

The lower mold 10 seated in the groove 110 can be rotated in a counterclockwise direction by the rotary plate 100 and the rotary plate 100 can be rotated by the concave groove 11 of the lower mold 10 May be aligned with the nozzle 212 of the lens-liquid injecting unit 200 so as to be located on the same axis. At this time, the nozzle 212 can be inserted into the concave groove 11 of the lower mold 10 in a state in which the lens liquid 1 is inserted.

The lens liquid injecting unit 200 may include a first elevating unit 210. The first elevating unit 210 may include a cylinder and may be driven up and down. At the end of the first elevating unit 210, a fixing plate 211 may be provided to fix the nozzle 212 without shaking. The nozzle 212 is fixed through the fixing plate 211 and is inserted deep into the concave groove 11 while being lowered through the first elevating unit 210 to inject the lens liquid into the concave groove 11, Can be prevented. The nozzle 212 is capable of injecting the lens liquid by a motor pump (not shown) and can be driven by various methods.

The lower mold 10 into which the lens liquid is injected can be rotated in the counterclockwise direction by the rotary plate 100 to move to the first press portion 300. The first pressing part 300 places the upper mold 20 supplied from the upper mold supplying part 310 to the lower mold 10 into which the lens liquid is injected to form the coupling mold 30. The lower mold 10 is automatically supplied from the upper mold supply part 310 so as to be kept in a predetermined direction, and will be described in detail later.

The upper mold 20 is formed in a cylindrical shape and the outer diameter of the upper mold 20 is the same as the inner diameter of the lower mold 10 and can be inserted into the lower mold 10. [ The upper end of the upper mold 20 may be formed with a second horizontal protruding surface 22 and the outer end surface of the end is formed with a convex portion 21 to be engaged with the concave groove 11 of the lower mold 10, The spherical shape of the lens can be formed.

The terminating end of the first crimping portion 300 is convexly formed to be inserted into a groove formed in the upper mold 20 and may include an air inlet 320. The air intake port 320 can accurately seat the upper mold 20 on the lower mold 10 by placing the upper mold 20 on the lower mold 10 after sucking the upper mold 20, The coupling mold 30 can be formed to be primary-bonded. Accordingly, since the adsorbed upper mold 20 is accurately placed on the lower mold 10, it is possible to increase the flatness uniformity of the contact lens upon compression and reduce the defect rate.

The coupling mold 30 is rotated in the counterclockwise direction by the rotary plate 100 and can be moved to the second pressing part 400. The second pressing part 400 may include a second elevating unit 410 and the second elevating unit 410 may include a cylinder to be driven up and down.

The end of the second lift unit 410 is wider than the upper surface of the engagement mold 30 so that the upper surface of the engagement mold 30 is uniformly pressed so that the lens liquid provided in the engagement mold 30 is pressed into the concave The uniformity of the plane of the contact lens can be increased by uniformly spreading between the groove 11 and the convex portion 21 of the upper mold 20. [ That is, the second pressing part 400 secondarily presses the coupling mold 30 formed by the first pressing part 300 so that the lens liquid is injected into the concave groove 11 of the lower mold 10 and the upper mold 20, The convex portion 21 of the contact lens 21 is uniformly spread, and the accuracy of molding the contact lens can be increased.

4 is a detailed view of a lower mold supply part of a contact lens molding apparatus according to an embodiment of the present invention. FIGS. 5A and 5B are partial detail drawings of a lower mold supply part of a contact lens molding apparatus according to an embodiment of the present invention to be.

4 and 5 will be described with reference to Figs. 1 to 3. Fig. The lower mold supply part 120 is formed by a lower surface of the upper mold and includes a first helical guiding part 121 having a helical flow path along the inner circumferential surface thereof and a second helical guiding part 121 formed at an end of the first guiding part 121 in a straight line inclined toward the hole 110 And the first linear guide portion 122 is provided to fix the lower mold 10 to the hole 110. [ The lower mold 10 can move along the guide portions of the vibration feeder (not shown) provided in the first spiral guide portion 121 and the first linear guide portion 122, respectively.

The first spiral guide portion 121 may have an engaging portion 123 at an end thereof. 5A, when the first horizontal projecting surface 12 of the lower mold 10 moves upward along the first helical guiding portion 121, the first horizontal projecting surface 12 is engaged The first linear guide part 122 is moved from the end of the first spiral guide part 121 to the first linear guide part 122 and can be seated in the hole 110 formed in the rotary plate 100. 5B, when the first horizontal protruding face 12 of the lower mold 10 faces downward, the first horizontal protruding face 12 can not be caught by the catching portion 123, And then moves down along the first spiral guide portion 121 again.

Through the repetitive process, the lower mold supply part 120 can always be placed in the hole 110 formed in the rotary plate 100 with the groove 11 of the lower mold 10 facing upward, (10) can be maintained in a certain direction, thereby shortening the processing time and enabling quick operation.

 The first linear guide 122 may include a dust removing unit (not shown) to remove dust adhering to the lower mold 10. The dust removing part injects compressed air to the lower mold 10 moving along the first linear guide part 122 to remove the dust adhering to the lower mold 10, thereby reducing the defect rate that can be caused in forming the contact lens, Can be molded.

Further, a detection sensor (not shown) may be provided to detect the movement of the lower mold 10 of the first linear guide portion 122. When the lower mold 10 moving along the first linear guide portion 122 is exhausted or the lower mold 10 is caught by the first linear guide portion 122 and the movement is stopped, You can guide it.

6 is a detailed view of an upper mold supply unit of a contact lens molding apparatus according to an embodiment of the present invention.

6 will be described with reference to FIGS. 1 to 3. FIG. The upper mold supplying part 310 serves to supply the upper mold 20 to the lower mold 10 into which the lens liquid is injected so that the coupling mold 30 is formed. The upper mold supplying part 310 is formed in a cylindrical shape and a guide 311a may be formed to prevent the upper mold 20 from falling outward along the outer circumferential surface of the cylindrical upper surface 311. [ At this time, the upper mold 20 is provided so that the convex portion 21 faces upward, and a discharge port 311b for discharging the upper mold 20 is formed. The upper mold supply part 310 has a vibration unit (not shown) and can transfer the upper mold 20 along the discharge port 311b by vibration.

The second spiral guide portion 312 and the second spiral guide portion 312 are formed so as to surround the upper mold supply portion 310 in the discharge port 311b. And a second linear guide portion 313 formed to be inclined toward the lower mold 10 into which the liquid is injected.

The second helical guiding portion 312 is formed by a plurality of wire ropes and is formed by twisting the wire rope in a twisted shape. The first horizontal projecting surface 22 of the upper mold 20 is sandwiched between the plurality of wire rods, The convex portion 21 of the upper mold 20 is moved to the straight guide portion 313 while being directed downward.

Since the second straight guide portion 313 is formed to be inclined, the upper mold 20 can be moved along the ramp to move to the lower mold 10 into which the lens liquid is injected. At this time, the second linear guide portion 313 can move to the end of the linear guide portion 313 by the vibration generated by the vibration feeder (not shown), and the upper mold 20, And can be coupled to the lower mold 10 after being adsorbed by the part 300.

The second linear guide 313 may include a dust removing unit 314 that removes dust from the upper mold 20 when the upper mold 20 moves. The dust removing unit 314 removes the dust adhering to the upper mold 20 by spraying the compressed air to the upper mold 20 moving along the second linear guide 313, And can be precisely molded.

The upper mold supply part 310 may include a sensing sensor (not shown) for detecting the movement of the upper mold 20 at a lower portion of the second linear guide part 313. The detection sensor can guide the detection by the acoustic signal or the like when the upper mold 20 moving along the second linear guide 313 is exhausted or when the movement is interrupted by the second linear guide 313.

7 is a detailed view of a discharge portion of a contact lens molding apparatus according to an embodiment of the present invention.

7 will be described with reference to FIGS. 1 to 3. The contact lens molding apparatus according to an embodiment of the present invention may further include a discharge unit 500. FIG. The discharge unit 500 may include an ejector 510 that moves horizontally along the rotating plate and the ejector 510 may be formed of a cylinder to adjust the ejection depth of the coupling mold 30. The ejector 510 causes the engagement mold 30 to be separated from the hole 110 by pushing the upper end of the engagement mold 30.

In addition, the ejector 510 can be moved to the second rotary plate 600 by setting the movement distance of the ejection depth to be different according to the frequency of the contact lens formed on the engagement mold 30. Therefore, even if the frequency of the contact lens is not displayed on the coupling mold 30, the contact lens is guided to the firing portion 700 by the dioptric power so that the contact lens is divided according to the frequency, thereby preventing the contact lens from being mixed, .

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate description of the present invention and to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: lower mold 20: upper mold
30: coupling mold 100: spindle
110: Hole 120: Lower mold supply part
121: first spiral guide part 122: first linear guide part
200: Lens liquid injecting part 210: Lowering unit
300: first crimping portion 310: upper mold supply portion
312: second spiral guide part 313: second straight guide part
320: air inlet port 400: second pressing portion
500: discharging part 510: discharging device
600: second rotating plate 700:

Claims (5)

A rotary plate on which a plurality of holes are formed along an outer circumferential surface and on which a lower mold having a first horizontal protruding surface is inserted and fixed;
A lens liquid injector for injecting the lens liquid into the lower mold seated on the rotary plate;
Wherein the lens mold is formed by pressing the upper mold and pressing the lens liquid between the lower mold and the upper mold to form a coupling mold, A pressing part;
A second squeezing unit for pressing the upper surface of the coupling mold to perform secondary squeezing to uniformly spread the lens liquid;
And a discharge portion for separating the coupling mold pressed by the second pressing portion from the hole,
Wherein the discharge portion includes an ejector that horizontally moves along the rotation plate,
Wherein the ejector is capable of separating the coupling mold from the hole by pushing the upper end of the coupling mold, and setting a moving distance of the ejection depth to be different according to the frequency of the contact lens formed on the coupling mold. The method according to claim 1,
Wherein the first pressing portion comprises:
Wherein the lower mold is provided with an air suction port at the end for pressing the upper mold, and after the upper mold is adsorbed through the air suction port, the lens mold is moved to the lower mold into which the lens liquid is injected and is coupled to the lower mold. . The method according to claim 1,
The upper mold is supplied at an upper mold supply portion,
Wherein the upper mold supply unit includes:
A guide formed on the upper surface of the cylindrical shape to prevent the upper mold from falling to the outside, an outlet for discharging the upper mold is formed in the guide,
A second helical guiding portion formed to surround the upper mold supplying portion in a spiral shape at the discharge port and a second linear guiding portion formed to be inclined from the end of the second helical guiding portion toward the hole. Device. delete The method according to claim 1,
And a second rotating plate having a perforation hole formed at the center thereof and disposed in the same plane as the rotating plate,
The second rotating plate includes:
And the transfer mold separated from the hole through the discharge portion is transferred to the firing portion.
KR1020150051086A 2015-04-10 2015-04-10 Apparatus for molding of contact lens KR101703986B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150051086A KR101703986B1 (en) 2015-04-10 2015-04-10 Apparatus for molding of contact lens

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KR20160121277A KR20160121277A (en) 2016-10-19
KR101703986B1 true KR101703986B1 (en) 2017-02-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220160202A (en) 2021-05-27 2022-12-06 김완태 Molding device for contact lens

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW207986B (en) * 1992-03-18 1993-06-21 Ciba Geigy Ag
KR101426068B1 (en) * 2012-08-20 2014-07-31 뉴바이오 (주) Join equipment of insert formolding contact lens molds

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220160202A (en) 2021-05-27 2022-12-06 김완태 Molding device for contact lens

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