CA2106328A1 - Laser assisted demolding of ophthalmic lenses - Google Patents
Laser assisted demolding of ophthalmic lensesInfo
- Publication number
- CA2106328A1 CA2106328A1 CA002106328A CA2106328A CA2106328A1 CA 2106328 A1 CA2106328 A1 CA 2106328A1 CA 002106328 A CA002106328 A CA 002106328A CA 2106328 A CA2106328 A CA 2106328A CA 2106328 A1 CA2106328 A1 CA 2106328A1
- Authority
- CA
- Canada
- Prior art keywords
- mold
- polymer
- lens
- mold portions
- laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- B29D11/00192—Demoulding, e.g. separating lenses from mould halves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
- B29C33/06—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using radiation, e.g. electro-magnetic waves, induction heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0003—Discharging moulded articles from the mould
-
- 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
- B29D11/00192—Demoulding, e.g. separating lenses from mould halves
- B29D11/00211—Demoulding, e.g. separating lenses from mould halves using heating means
-
- 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
- B29D11/00192—Demoulding, e.g. separating lenses from mould halves
- B29D11/00221—Demoulding, e.g. separating lenses from mould halves using prying means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0838—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using laser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/009—Using laser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
- B29L2011/0041—Contact lenses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/808—Lens mold
Abstract
Described is an apparatus and method for removing a molded ophthalmic lens from between the mold portions in which it is produced. A source of intense electromagnetic radiation, preferably a carbon dioxide (CO2) laser of about 80 Watts at a wavelength of 10.6 µm, is applied to at least one of the mold portions. The exposure of the mold portion to the laser is between one half and one second.
Differential expansion of the heated mold polymer relative to the cooler polymer shifts one surface with respect to the other, and the shear force :breaks the polymerized lens\polymer mold adhesion and assists in the separation of mold portions. The greater the temperature gradient between the surfaces of the mold portions, the greater the shearing force and the easier the mold portions separate.
The heated back mold portion is promptly removed so that very little energy is transferred to the polymer lens, avoiding the possibility of thermal decomposition of the lens.
Differential expansion of the heated mold polymer relative to the cooler polymer shifts one surface with respect to the other, and the shear force :breaks the polymerized lens\polymer mold adhesion and assists in the separation of mold portions. The greater the temperature gradient between the surfaces of the mold portions, the greater the shearing force and the easier the mold portions separate.
The heated back mold portion is promptly removed so that very little energy is transferred to the polymer lens, avoiding the possibility of thermal decomposition of the lens.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US947,218 | 1992-09-18 | ||
US07/947,218 US5294379A (en) | 1992-09-18 | 1992-09-18 | Laser assisted demolding of ophthalmic lenses |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2106328A1 true CA2106328A1 (en) | 1994-03-19 |
CA2106328C CA2106328C (en) | 2001-11-27 |
Family
ID=25485761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002106328A Expired - Lifetime CA2106328C (en) | 1992-09-18 | 1993-09-16 | Laser assisted demolding of ophthalmic lenses |
Country Status (10)
Country | Link |
---|---|
US (2) | US5294379A (en) |
EP (1) | EP0588660B1 (en) |
JP (1) | JP3293975B2 (en) |
AT (1) | ATE140180T1 (en) |
AU (1) | AU662835B2 (en) |
CA (1) | CA2106328C (en) |
CZ (1) | CZ193893A3 (en) |
DE (1) | DE69303562T2 (en) |
DK (1) | DK0588660T3 (en) |
IL (1) | IL106653A (en) |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5770119A (en) * | 1992-09-18 | 1998-06-23 | Johnson & Johnson Vision Products, Inc. | Laser demolding method |
US5326505A (en) * | 1992-12-21 | 1994-07-05 | Johnson & Johnson Vision Products, Inc. | Method for treating an ophthalmic lens mold |
EP0657264B1 (en) * | 1993-12-13 | 1999-07-21 | Novartis AG | Process and device for the production of a contact lens |
US5894002A (en) * | 1993-12-13 | 1999-04-13 | Ciba Vision Corporation | Process and apparatus for the manufacture of a contact lens |
CA2181984C (en) * | 1994-01-31 | 2000-06-13 | Rajan S. Bawa | Treatment of contact lenses with supercritical fluid |
IL113695A0 (en) * | 1994-06-10 | 1995-08-31 | Johnson & Johnson Vision Prod | Laser demolding apparatus and method |
US5850107A (en) * | 1994-06-10 | 1998-12-15 | Johnson & Johnson Vision Products, Inc. | Mold separation method and apparatus |
IL113826A0 (en) * | 1994-06-10 | 1995-08-31 | Johnson & Johnson Vision Prod | Method and apparatus for demolding ophthalmic contact lenses |
US5656208A (en) * | 1994-06-10 | 1997-08-12 | Johnson & Johnson Vision Products, Inc. | Method and apparatus for contact lens mold filling and assembly |
US5804107A (en) * | 1994-06-10 | 1998-09-08 | Johnson & Johnson Vision Products, Inc. | Consolidated contact lens molding |
US5849209A (en) * | 1995-03-31 | 1998-12-15 | Johnson & Johnson Vision Products, Inc. | Mold material made with additives |
US5690865A (en) * | 1995-03-31 | 1997-11-25 | Johnson & Johnson Vision Products, Inc. | Mold material with additives |
AU713558B2 (en) * | 1995-05-01 | 1999-12-02 | Johnson & Johnson Vision Products, Inc. | Laser demolding apparatus and method |
AU706496B2 (en) * | 1995-11-21 | 1999-06-17 | Johnson & Johnson Vision Products, Inc. | Infra-red heat source for demolding contact lenses |
US5693268A (en) * | 1996-04-01 | 1997-12-02 | Johnson & Johnson Vision Products, Inc. | Wedge demolding of cast lens mold assemblies |
US5820895A (en) * | 1996-06-04 | 1998-10-13 | Johnson & Johnson Vision Products, Inc. | Conductive probe for heating contact lens mold assemblies during demolding |
US5815238A (en) * | 1996-09-10 | 1998-09-29 | Johnson & Johnson Vision Products, Inc. | Scanning laser demolding of ophthalmic lenses |
US5936704A (en) | 1997-12-22 | 1999-08-10 | Gabrielian; Grant | Marked contact lens bearing optical marking element |
US6203156B1 (en) | 1998-03-31 | 2001-03-20 | Johnson & Johnson Vision Care, Inc. | Contact lenses bearing marks |
US6024448A (en) * | 1998-03-31 | 2000-02-15 | Johnson & Johnson Vision Products, Inc. | Contact lenses bearing identifying marks |
US20040074525A1 (en) * | 2001-03-27 | 2004-04-22 | Widman Michael F. | Transfer apparatus and method and a transfer apparatus cleaner and method |
US20070157553A1 (en) * | 1998-12-21 | 2007-07-12 | Voss Leslie A | Heat seal apparatus for lens packages |
US20040112008A1 (en) | 1998-12-21 | 2004-06-17 | Voss Leslie A. | Heat seal apparatus for lens packages |
US6663801B2 (en) * | 2001-04-06 | 2003-12-16 | Johnson & Johnson Vision Care, Inc. | Silicon carbide IR-emitter heating device and method for demolding lenses |
WO2002087842A1 (en) * | 2001-05-02 | 2002-11-07 | Concepcionlicence Ag | Method and device for demolding molded lenses |
US20030164563A1 (en) * | 2002-03-04 | 2003-09-04 | Olin Calvin | Use of microwave energy to disassemble, release, and hydrate contact lenses |
EP1849589A3 (en) * | 2002-03-04 | 2009-03-25 | Johnson and Johnson Vision Care, Inc. | Use of microwave energy to dissassemble, release, and hydrate contact lenses |
KR101021433B1 (en) * | 2002-08-16 | 2011-03-15 | 존슨 앤드 존슨 비젼 케어, 인코포레이티드 | A mold for producing contact lenses, a method of making a lens, a lens, and a method for making a coated lenses |
EP1807719A2 (en) * | 2004-10-28 | 2007-07-18 | Novartis AG | Apparatus for the transport of light emitted by a short-arc lamp |
US20060097415A1 (en) * | 2004-11-05 | 2006-05-11 | Watterson Robert J Jr | Methods of demolding ophthalmic lenses |
US7799249B2 (en) * | 2005-08-09 | 2010-09-21 | Coopervision International Holding Company, Lp | Systems and methods for producing silicone hydrogel contact lenses |
DE102006020771B3 (en) | 2006-05-03 | 2008-01-10 | Eisenmann Anlagenbau Gmbh & Co. Kg | Lifting table especially for small lifting heights |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE662573A (en) * | 1964-05-05 | |||
DD95679A1 (en) * | 1972-02-16 | 1973-02-12 | Funk Hans Joachim | METHOD AND DEVICE FOR PRODUCING GFP FORM PARTS |
US3938775A (en) * | 1973-08-20 | 1976-02-17 | Sarofeen George M J | Mold assembly for casting synthetic lenses |
US4155962A (en) * | 1977-05-25 | 1979-05-22 | Neefe Optical Laboratory, Inc. | Method of removing molded lenses from the mold |
FR2477059A1 (en) * | 1980-02-28 | 1981-09-04 | Medicornea Sa | METHOD OF MANUFACTURING BY MOLDING CONTACT LENSES AND LENSES OBTAINED |
FR2477058A1 (en) * | 1980-02-28 | 1981-09-04 | Medicornea Sa | METHOD OF MANUFACTURING BY MOLDING CONTACT LENSES, AND LENSES OBTAINED |
FR2523505A2 (en) * | 1982-03-17 | 1983-09-23 | Medicornea Sa | IMPROVED PROCESS FOR THE MANUFACTURE, BY MOLDING, OF CONTACT LENSES AND IMPLEMENTING DEVICE |
US4652721A (en) * | 1985-01-03 | 1987-03-24 | Dow Corning Corporation | Method and apparatus for edge contouring lenses |
US4728469A (en) * | 1986-01-28 | 1988-03-01 | Sperti Drug Products, Inc. | Method and apparatus for making a plastic lens |
US4909969A (en) * | 1989-08-23 | 1990-03-20 | Wood Kenneth E | Method and apparatus for removing a contact lens from a plastic mold |
US5160749A (en) * | 1990-10-30 | 1992-11-03 | Minnesota Mining And Manufacturing Company | Three piece mold assembly for making an ocular device |
-
1992
- 1992-09-18 US US07/947,218 patent/US5294379A/en not_active Expired - Lifetime
-
1993
- 1993-08-10 IL IL10665393A patent/IL106653A/en not_active IP Right Cessation
- 1993-09-03 AU AU46130/93A patent/AU662835B2/en not_active Expired
- 1993-09-16 CA CA002106328A patent/CA2106328C/en not_active Expired - Lifetime
- 1993-09-17 EP EP93307360A patent/EP0588660B1/en not_active Expired - Lifetime
- 1993-09-17 AT AT93307360T patent/ATE140180T1/en active
- 1993-09-17 CZ CZ931938A patent/CZ193893A3/en unknown
- 1993-09-17 JP JP25359793A patent/JP3293975B2/en not_active Expired - Fee Related
- 1993-09-17 DE DE69303562T patent/DE69303562T2/en not_active Expired - Lifetime
- 1993-09-17 DK DK93307360.3T patent/DK0588660T3/en active
-
1994
- 1994-03-07 US US08/207,443 patent/US5417557A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0588660B1 (en) | 1996-07-10 |
CA2106328C (en) | 2001-11-27 |
ATE140180T1 (en) | 1996-07-15 |
DE69303562D1 (en) | 1996-08-14 |
US5417557A (en) | 1995-05-23 |
JP3293975B2 (en) | 2002-06-17 |
DK0588660T3 (en) | 1996-08-05 |
CZ193893A3 (en) | 1994-05-18 |
EP0588660A1 (en) | 1994-03-23 |
AU4613093A (en) | 1994-03-24 |
AU662835B2 (en) | 1995-09-14 |
US5294379A (en) | 1994-03-15 |
IL106653A0 (en) | 1993-12-08 |
DE69303562T2 (en) | 1996-12-19 |
IL106653A (en) | 1996-01-19 |
JPH06190940A (en) | 1994-07-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEC | Expiry (correction) |
Effective date: 20131018 |