WO2009069940A1 - Dispositif et procédé de fabrication pour objectif - Google Patents

Dispositif et procédé de fabrication pour objectif Download PDF

Info

Publication number
WO2009069940A1
WO2009069940A1 PCT/KR2008/006975 KR2008006975W WO2009069940A1 WO 2009069940 A1 WO2009069940 A1 WO 2009069940A1 KR 2008006975 W KR2008006975 W KR 2008006975W WO 2009069940 A1 WO2009069940 A1 WO 2009069940A1
Authority
WO
WIPO (PCT)
Prior art keywords
curable resin
irradiation
area
light
lens
Prior art date
Application number
PCT/KR2008/006975
Other languages
English (en)
Inventor
Shinill Kang
Ji Seok Lim
Min Seok Choi
Original Assignee
Optomecha Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Optomecha Co., Ltd. filed Critical Optomecha Co., Ltd.
Publication of WO2009069940A1 publication Critical patent/WO2009069940A1/fr

Links

Classifications

    • 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
    • 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
    • B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
    • 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
    • B29C35/0888—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds
    • B29C35/0894—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds provided with masks or diaphragms
    • 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
    • B29D11/00403—Producing compound 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
    • B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
    • B29D11/00442—Curing the lens material
    • 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
    • B29C2035/0827—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 UV radiation
    • 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

Definitions

  • the present invention relates to a device and a method for fabricating a lens, and more particularly, to a device and a method for fabricating a lens which can provide a lens with high quality by effectively controlling shrinkage occurred in a lens forming process.
  • An aspheric lens can be fabricated by using a glass lens as a base and forming an aspheric resin layer on the glass lens.
  • Such an aspheric lens has an advantage of obtaining good optical performance through a relatively low-cost process.
  • Such an aspheric lens can be fabricated by using a glass lens with high refractivity as a base and forming an aspheric resin layer in a film form thereon through a transfer process.
  • FIG. 1 is a view schematically illustrating a conventional lens fabrication method.
  • a glass lens base 4 is seated on a holder 2 to be aligned and fixed.
  • UV curable resin 3 is applied onto an aspheric mold 1 or the base 4 which has been precisely manufactured.
  • the alignment and height setting of the aspheric lens in relation to the base 4 is carried out, whereby the UV curable resin fills a cavity between the base and the aspheric mold.
  • the UV curable resin 3 is irradiated with UV light through the base and thereby is cured. Through this, the shape of the aspheric mold is transferred to the UV curable resin on the base, and thereby forms an aspheric lens.
  • a thick area of the UV curable resin is cured slower than a thin area.
  • An object of the present invention is to provide a device and a method which makes it possible to effectively cure UV curable resin without being affected by the shape of a base or the UV curable resin and thereby fabricate a lens with high precision.
  • a device for fabricating a lens comprising, a mold which molds UV curable resin applied onto a base; an UV source which irradiates the UV curable resin with UV light; and an irradiation rate controller which controls, according to position, irradiation rates at which the UV curable resin is irradiated with the UV light.
  • the UV curable resin is cured from a central area.
  • the resin at a peripheral area which is not yet cured is provided for the central area and thereby compensates for volume decrease due to shrinkage at the central area. This makes it possible to prevent internal porosities or surface depressions due to the shrinkage inside an effective diameter of a lens and thereby manufacture a lens with high precision.
  • the irradiation rate controller controls the irradiation rates such that an irradiation rate at which a central area of the UV curable resin is irradiated is higher than an irradiation rate at which a peripheral area of the UV curable resin is irradiated.
  • the mold provides an empty space around the UV curable resin.
  • the irradiation rate controller is a mask which has a higher transmittance to the UV light at a central area than a peripheral area.
  • the irradiation rate controller is a diaphragm which expands an irradiation area from the central area of the UV curable resin to the peripheral area of the UV curable resin.
  • the irradiation rate controller is an optical system whose focal length can be controlled.
  • the irradiation rate controller moves an irradiation area in a radial direction from the central area of the UV curable resin to the peripheral area of the UV curable resin.
  • the present invention provides a method for fabricating a lens comprising a first step of applying UV curable resin onto a base, a second step of molding the UV curable resin applied onto the base using a mold, and a third step of irradiating the UV curable resin with UV light and at the same time, controlling, according to position, irradiation rates at which the UV curable resin is irradiated with the UV light.
  • an irradiation rate at which a central area of the UV curable resin is irradiated is controlled to be higher than an irradiation rate at which a peripheral area of the UV curable resin is irradiated.
  • the third step includes expanding an irradiation area from the central area of the UV curable resin to the peripheral area of the UV curable resin.
  • the third step includes moving an irradiation area from the central area of the UV curable resin to the peripheral area of the UV curable resin.
  • the present invention it is possible to reduce the above defects which can occur on a lens surface or inside a lens while the lens is formed using UV curable resin. [24] That is, it is possible to fabricate a lens with high quality by effectively controlling the shrinkage of the UV curable resin such that most shrinkage occurs at a peripheral area of the UV curable resin. [25] In addition, it is possible to reduce geometrical deviation by effectively controlling a place where the shrinkage occurs.
  • FIG. 1 is a view schematically illustrating a conventional lens fabrication device
  • FIG. 2 is a view schematically illustrating a lens fabrication device according to a first embodiment
  • FIG. 3 is a view schematically illustrating a lens fabrication device according to a second embodiment
  • FIGs. 4 and 5 are views schematically illustrating operations of a lens fabrication device according to a third embodiment
  • FIG. 6 is a view schematically illustrating a lens fabricated by a lens fabrication method according to a fourth embodiment.
  • FIG. 2 is a view schematically illustrating a lens fabrication device according to a first embodiment.
  • the lens fabrication device according to the present invention includes a mold 1, a UV source, and an irradiation rate controller.
  • the mold molds UV curable resin applied onto a base.
  • the UV source irradiates the UV curable resin with UV light.
  • the irradiation rate controller controls irradiation rates according to position.
  • a mask 5a is used as the irradiation rate controller.
  • a holder 2 has a circular plane on which the glass lens base is received.
  • the holder 2 and the base 4 have such diameters that the centers thereof are aligned with each other.
  • the base 4 can be a convex lens as shown in the figure, a concave lens, an aspheric lens, a flat structure, a structure with a free formed surface or the like.
  • Fig. 2 shows that the UV curable resin is applied on only one surface of the base but the present invention is not limited thereto.
  • the UV curable resin can be applied on both surfaces of the base.
  • the aspheric mold is moved down to a predetermined height.
  • the space between the base 4 and the mold 1 is filled with the UV curable resin.
  • the mod preferably has open structure with respect to the UV curable resin. That is, the mold has such structure that there is empty space around the UV curable resin.
  • the transferred surface of the mold coming into contact with the UV curable resin is an aspheric surface.
  • the transferred surface of the mold does not need to be an aspheric surface.
  • the UV light is given from the UV source through a mask 5a whose trans- mittance varies according to position and the base 4 to the UV curable resin, whereby the UV curable resin adheres to the base 4 to form an aspheric lens. Due to the difference in intensity according to position, a central area of the UV curable resin to which UV light with high intensity is given is cured ahead and a peripheral area of the UV curable resin is cured later. Accordingly, the resin at the peripheral area can compensate for the shrinkage at the central area to prevent defects.
  • the base through which the UV light is transmitted is used.
  • UV light is given from the direction of the base.
  • the UV curable resin is cured by using the UV light transmitted through the base.
  • the present invention is not limited thereto.
  • the irradiation rate controller controls irradiation rates such that an irradiation rate at which the central area of the UV curable resin is irradiated is higher than an irradiation rate at which the peripheral area of the UV curable resin is irradiated.
  • the irradiation rate means 'the total amount of irradiated UV light' / 'an irradiation time.
  • the irradiation time means the elapsed time from the beginning of the irradiation of the UV light to a certain time point.
  • the total amount of irradiated UV light means the total amount of UV light given onto a particular area during the irradiation time.
  • the irradiation rates that is, 'the total amount of irradiated UV light' / 'the irradiation time of the UV light' are controlled in such a manner that those of the central area and the peripheral area are different from each other, whereby the curing rates of the UV curable resin can be controlled.
  • the irradiation rate controller is arranged in a traveling direction of the UV light from the UV source. That is, as shown in Fig. 2, the irradiation rate controller is arranged between the UV source and the base.
  • the mask used as the irradiation rate controller has a higher transmittance at the central area than at the peripheral area.
  • the mask 5 a controls intensity distribution such that the intensity of the UV light given to the central area is higher than that of the UV light given to the peripheral area.
  • a method for fabricating the lens according to the present invention will be described. First, a first step of applying the UV curable resin onto the base is carried out. Then, a second step of molding the UV curable resin applied onto the base using the mold is carried out. Thereafter, a third step of irradiating the UV curable resin with the UV light and at the same time, controlling the irradiation rates of the UV light according to position is carried out.
  • the mask can have a plurality of holes.
  • the UV light is given from the UV source through the holes to the UV curable resin.
  • the holes are provided more densely for the central area than for the peripheral area. Accordingly, the mask has a higher transmittance at the central area than at the peripheral area.
  • the mask can be a transparent plate on which a non-transparent pattern is formed.
  • the transparent plate can transmit the UV light.
  • the non-transparent pattern can not transmit the UV light.
  • a glass plate can be used as the transparent plate.
  • a non-transparent ring pattern can be provided more densely for the peripheral area than for the central area of the mask. Accordingly, the mask has a higher transmittance at the central area than at the peripheral area.
  • the mask can be a gray scale mask with a pattern which has a higher transmittance at the central area than at the peripheral area.
  • FIG. 3 is a view schematically illustrating a lens fabrication device according to a second embodiment. [60] Referring to Fig.
  • a similar process as in Fig. 2 is carried out, That is, a base 4 is seated on a holder 2. A predetermined amount of UV curable resin is applied. An aspheric mold 1 is aligned with the base 4. [61] However, the irradiation rates are controlled by using a diaphragm 5b instead of the mask 5 a. [62] More particularly, the UV light is given through the diaphragm 5b to the base. In the initial stage, the diaphragm has a small opening. As the process progresses, the size of the opening is increased by a diaphragm lever 6.
  • the UV curable resin is cured from a central area to a peripheral area, whereby an aspheric lens of the UV curable resin is formed.
  • the diaphragm controls an area where the UV light is given.
  • the diaphragm expands the irradiation area from the central area to the peripheral area, which enables the irradiation rates to be higher at the central area than at the peripheral area.
  • Figs 4 and 5 are views schematically illustrating operations of a lens fabrication device according to a third embodiment.
  • an optical system 5c whose focal length can be controlled is used as the irradiation rate controller in the lens fabrication device according to this embodiment.
  • the focus of the optical system 5c is positioned at the central area of the UV curable resin. As time goes by, the focus moves farther from the UV curable resin. [67] Referring to Fig. 4, in the initial stage, the focus is positioned at the central area of the UV curable resin. As time goes by, the focal length is lengthened. (fi->f 2 ) [68] Referring to Fig. 5, in the initial stage, the focus is positioned at the central area of the UV curable resin. As time goes by, the focal length is shortened. (f ! ->f 2 ') [69] This makes the irradiation area of the UV light to expand from the central area of the
  • a zoom lens device can be used as the optical system.
  • an irradiation rate controller which moves the ir- radiation area from the central area to the peripheral area can be used. That is, in the initial stage, the UV light is controlled to be given only to the central area. As time goes by, the irradiation area is moved to the peripheral area. In the final stage, the UV light is given only to the peripheral area.
  • the irradiation area is preferably moved in the radial direction.
  • FIG. 6 is a view schematically illustrating a lens fabricated by a lens fabrication method according to a fourth embodiment.
  • Figs. 2 to 5 exemplify the devices and methods for fabricating a compound lens.
  • the present invention also includes a lens of a single material.
  • the base in Fig. 6 is a hollow structure which has a through-hole at its center.
  • UV curable resin is applied in such a manner that it covers the through-hole. Then, the UV curable resin is molded by the mold.
  • a barrel holder, a barrel, a cap, a stop, a spacer, a flare stop, etc can be used as the base.

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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Toxicology (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Electromagnetism (AREA)

Abstract

Dispositif de fabrication d'objectifs comprenant un moule pour le moulage d'une résine durcissable aux UV appliquée sur une base; une source de rayons ultraviolets irradiant la résine durcissable aux UV; et une unité de commande de taux d'irradiation qui règle, en fonction de la position, le taux d'irradiation aux UV. Ladite unité de commande de taux d'irradiation règle de préférence les taux d'irradiation de telle sorte que le taux d'irradiation appliqué à la région centrale de la résine durcissable aux UV est plus élevé que celui appliqué à la périphérie de ladite résine. Le moule délimite de préférence un espace vide autour de la résine durcissable aux UV. Dans un mode de réalisation, l'unité de commande de taux d'irrradiation est constituée par un masque dont la transmittance aux rayons ultraviolets est plus élevée au centre qu'à la périphérie. Dans un autre mode de réalisation, ladite unité est constituée par une membrane dont la zone d'irradiation va de la zone centrale de la résine durcissable aux UV à la périphérie de ladite résine. Dans un autre mode de réalisation encore, l'unité de commande du taux d'irradiation fait se déplacer radialement une zone d'irradiation du centre vers la périphérie de la résine durcissable aux UV.
PCT/KR2008/006975 2007-11-27 2008-11-26 Dispositif et procédé de fabrication pour objectif WO2009069940A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20070121407A KR100938643B1 (ko) 2007-11-27 2007-11-27 복합렌즈 성형장치 및 방법
KR10-2007-0121407 2007-11-27

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WO2009069940A1 true WO2009069940A1 (fr) 2009-06-04

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011085880A1 (fr) 2009-12-21 2011-07-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procédé et dispositif pour fabriquer une structure
US8587882B2 (en) 2009-12-21 2013-11-19 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Optical layer stack and method for manufacturing the same
US8641936B2 (en) 2009-12-21 2014-02-04 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Method for manufacturing an optical structure
WO2014086182A1 (fr) * 2012-12-07 2014-06-12 中兴通讯股份有限公司 Procédé de traitement de lentille, lentille et équipement électronique associé
DE102013207243A1 (de) * 2013-04-22 2014-10-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und verfahren zur herstellung einer struktur aus aushärtbarem material durch abformung
CN104570262A (zh) * 2013-10-25 2015-04-29 玉晶光电(厦门)有限公司 光学成像镜头

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* Cited by examiner, † Cited by third party
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TWI455783B (zh) * 2012-01-02 2014-10-11 Hortek Crystal Co Ltd 雷射加工方法及其所形成的加工件
KR102146934B1 (ko) * 2018-11-14 2020-08-21 한국광기술원 렌즈 제조장치 및 방법

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JPH07124966A (ja) * 1993-11-08 1995-05-16 Ricoh Co Ltd 複合レンズ体の成形方法および成形装置並びにその複合レンズ体
JP2003142722A (ja) * 2001-11-01 2003-05-16 Nippon Telegr & Teleph Corp <Ntt> 光電気変換素子

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JP2006142722A (ja) * 2004-11-22 2006-06-08 Seiko Precision Inc 樹脂複合レンズの製造方法及び製造装置

Patent Citations (2)

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JPH07124966A (ja) * 1993-11-08 1995-05-16 Ricoh Co Ltd 複合レンズ体の成形方法および成形装置並びにその複合レンズ体
JP2003142722A (ja) * 2001-11-01 2003-05-16 Nippon Telegr & Teleph Corp <Ntt> 光電気変換素子

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011085880A1 (fr) 2009-12-21 2011-07-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procédé et dispositif pour fabriquer une structure
US8587882B2 (en) 2009-12-21 2013-11-19 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Optical layer stack and method for manufacturing the same
US8641936B2 (en) 2009-12-21 2014-02-04 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Method for manufacturing an optical structure
US8945458B2 (en) 2009-12-21 2015-02-03 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Method and apparatus for producing a structure, molding tool
US9551814B2 (en) 2009-12-21 2017-01-24 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Method for manufacturing a structure, optical component, optical layer stack
EP3272489A2 (fr) 2009-12-21 2018-01-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procédé et dispositif de fabrication d'une structure, outil de moulage
EP3272489A3 (fr) * 2009-12-21 2018-04-18 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procédé et dispositif de fabrication d'une structure, outil de moulage
WO2014086182A1 (fr) * 2012-12-07 2014-06-12 中兴通讯股份有限公司 Procédé de traitement de lentille, lentille et équipement électronique associé
DE102013207243A1 (de) * 2013-04-22 2014-10-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und verfahren zur herstellung einer struktur aus aushärtbarem material durch abformung
DE102013207243B4 (de) 2013-04-22 2019-10-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und verfahren zur herstellung einer struktur aus aushärtbarem material durch abformung
US11014269B2 (en) 2013-04-22 2021-05-25 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Device and method of manufacturing a structure made of a curable material by means of molding
CN104570262A (zh) * 2013-10-25 2015-04-29 玉晶光电(厦门)有限公司 光学成像镜头

Also Published As

Publication number Publication date
KR20090054633A (ko) 2009-06-01
KR100938643B1 (ko) 2010-01-28

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