JP2006017795A - Lens unit and manufacturing method thereof - Google Patents

Lens unit and manufacturing method thereof Download PDF

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Publication number
JP2006017795A
JP2006017795A JP2004192785A JP2004192785A JP2006017795A JP 2006017795 A JP2006017795 A JP 2006017795A JP 2004192785 A JP2004192785 A JP 2004192785A JP 2004192785 A JP2004192785 A JP 2004192785A JP 2006017795 A JP2006017795 A JP 2006017795A
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Prior art keywords
lens
transparent resin
resin
combination
lenses
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JP2004192785A
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JP4815760B2 (en
Inventor
Masayoshi Kamihira
真嘉 上平
Akihiko Matsumoto
朗彦 松本
Katsushi Watanabe
克司 渡邊
Toshiyuki Mashima
利行 真島
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Konica Minolta Opto Inc
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Konica Minolta Opto Inc
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Priority to JP2004192785A priority Critical patent/JP4815760B2/en
Priority to US11/091,290 priority patent/US7522355B2/en
Publication of JP2006017795A publication Critical patent/JP2006017795A/en
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    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission welding
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1406—Ultraviolet [UV] 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1477—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of an absorber or impact modifier
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1606—Ultraviolet [UV] radiation, e.g. by ultraviolet excimer lasers
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/543—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining more than two hollow-preforms to form said hollow 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/545—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles one hollow-preform being placed inside the other
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
    • 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
    • B29C2035/0822—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 IR 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
    • B29C35/08—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
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Lens Barrels (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens unit excellent in assembly workability and capable of being made small in size, and to provide a manufacturing method thereof. <P>SOLUTION: The lens unit 1 is constituted so that two or more transparent resin lenses 11, 12 are combined. Therein, at least one transparent resin lens 12 has ultraviolet ray absorbability, and the transparent resin lens 12 and the other transparent resin lens 11 are joined by welding. Further, the optical lens unit 1 has an opaque lens barrel 13 which holds the entire combination of the transparent resin lenses 11, 12 and it is desirable that the transparent resin lens 12 and the lens barrel 13 are joined by welding. Furthermore, ventilation grooves 15 are desirably formed on the joint portion between the transparent resin lenses 11, 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は，複数枚の透明樹脂レンズを組み合わせた組み合わせレンズとその製造方法に関する。さらに詳細には，複数枚の樹脂レンズがそれらを覆う鏡筒に保持された組み合わせレンズおよびその製造方法に関するものである。   The present invention relates to a combination lens obtained by combining a plurality of transparent resin lenses and a method for manufacturing the same. More specifically, the present invention relates to a combination lens in which a plurality of resin lenses are held in a lens barrel covering them, and a manufacturing method thereof.

従来より光学レンズとして，樹脂製の透明レンズが多く用いられている。特に，カメラ用のレンズ等では，複数個の樹脂レンズを組み合わせて使用されることが多い。そのため，樹脂レンズ同士，あるいは樹脂レンズとそれを保持する鏡筒とを互いに固定する必要がある。このような樹脂レンズでは，各レンズの有効領域の外周に接合のための領域を一体的に形成しておき，その部分において，接着剤や超音波ウェルダを利用した接合が行われていた。   Conventionally, resin-made transparent lenses are often used as optical lenses. In particular, a camera lens or the like is often used in combination with a plurality of resin lenses. Therefore, it is necessary to fix the resin lenses or the resin lenses and the lens barrel holding the resin lenses to each other. In such a resin lens, an area for bonding is integrally formed on the outer periphery of the effective area of each lens, and bonding using an adhesive or an ultrasonic welder is performed at that portion.

これに対し，特許文献１，２には，レーザ光を利用して樹脂材料を接合する方法が開示されている。例えば，特許文献１には，レーザ光に対して吸収性の材料と非吸収性の材料とを重ね合わせ，非吸収性の材料の側からレーザ光を照射することによる接合方法が開示されている。また，特許文献２には，透明樹脂部材同士の間に薄い赤外線吸収透明フィルムを挟んでレーザ光を照射することによる接合方法が開示されている。また，特許文献３には，透明レンズに紫外線吸収剤や赤外線吸収剤を混入することにより，波長域ごとの透過率を調整したプラスチックレンズが開示されている。
特開昭６０−２１４９３１号公報 特開２００３−１８１９３１号公報 特開平７−９２３０１号公報 On the other hand, Patent Documents 1 and 2 disclose a method of joining resin materials using laser light. For example, Patent Document 1 discloses a bonding method in which a material that absorbs laser light and a non-absorbing material are overlapped and laser light is irradiated from the non-absorbing material side. . Patent Document 2 discloses a joining method by irradiating a laser beam with a thin infrared absorbing transparent film sandwiched between transparent resin members. Patent Document 3 discloses a plastic lens in which the transmittance for each wavelength region is adjusted by mixing an ultraviolet absorber or an infrared absorber into a transparent lens.
JP-A-60-214931 JP 2003-181931 A JP-A-7-92301

しかしながら，前記した従来の組み合わせレンズにおける接合には次のような問題点があった。まず，接着剤による接合方法では，接着剤の塗布・硬化に時間がかかる。また，接着剤のレンズ面への回り込み等による外観上の不具合が発生するおそれがあった。超音波ウェルダによる接合方法では，ホーンで押さえ込む必要があるため，レンズの形状や大きさに制約があった。さらに，携帯電話等の小型カメラ用に用いられる小型の組み合わせレンズ等では赤外線吸収透明フィルムを挟む作業は容易ではなく，部品点数の増加を招くとともに組立作業性を悪化させるおそれがあった。   However, there are the following problems in the joining in the conventional combination lens described above. First, in the bonding method using an adhesive, it takes time to apply and cure the adhesive. In addition, there is a risk of appearance problems due to the wraparound of the adhesive to the lens surface. In the joining method using an ultrasonic welder, the shape and size of the lens are limited because it is necessary to press down with a horn. Furthermore, with a small combination lens or the like used for a small camera such as a mobile phone, it is not easy to sandwich the infrared absorbing transparent film, which may increase the number of parts and deteriorate the assembling workability.

本発明は，前記した従来の組み合わせレンズおよびその製造方法が有する問題点を解決するためになされたものである。すなわちその課題とするところは，組立作業性が良好で，小型化が可能な組み合わせレンズおよびその製造方法を提供することにある。   The present invention has been made in order to solve the problems of the conventional combination lens and the manufacturing method thereof. That is, an object of the present invention is to provide a combination lens that has good assembly workability and can be reduced in size, and a manufacturing method thereof.

この課題の解決を目的としてなされた組み合わせレンズは，２以上の透明樹脂レンズを組み合わせてなる組み合わせレンズであって，少なくとも１つの透明樹脂レンズが紫外線吸収剤を含有し，その透明樹脂レンズと他の透明樹脂レンズとが溶着により接合されているものである。   A combination lens made for the purpose of solving this problem is a combination lens in which two or more transparent resin lenses are combined, and at least one transparent resin lens contains an ultraviolet absorber. A transparent resin lens is joined by welding.

本発明の組み合わせレンズによれば，２以上の透明樹脂レンズが溶着により接合されているので，接着剤の回り込み等の問題点はなく，その外観は良好なものとなる。少なくとも１つの透明樹脂レンズが紫外線吸収能を有するので，その透明樹脂レンズによって紫外線を吸収させることができ，紫外線を吸収させるために別部材を必要としない。従って，組立作業性が良好で，小型化が可能な組み合わせレンズとなっている。   According to the combination lens of the present invention, since two or more transparent resin lenses are joined by welding, there is no problem of wraparound of the adhesive and the appearance is good. Since at least one transparent resin lens has the ability to absorb ultraviolet rays, the transparent resin lens can absorb ultraviolet rays, and no separate member is required to absorb ultraviolet rays. Therefore, it is a combination lens that has good assembly workability and can be miniaturized.

さらに本発明では，透明樹脂レンズの組み合わせ全体を保持する不透明な鏡筒を有し，透明樹脂レンズの１つと鏡筒とが溶着により接合されていることが望ましい。
このようにすれば，組み合わせレンズ全体が鏡筒によって保持され，取扱が容易である。 Furthermore, in the present invention, it is desirable to have an opaque lens barrel that holds the entire combination of transparent resin lenses, and one of the transparent resin lenses and the lens barrel are joined by welding.
In this way, the entire combination lens is held by the lens barrel and is easy to handle.

さらに本発明では，接合面に通気溝が形成されていることが望ましい。
このようにすれば，接合時に空気が逃げることにより接合バラツキが低減する。また，溶着時に発生するガスが逃げることにより，溶着後の環境温度変化に伴う内部空気の熱膨張応力によるレンズの変形を防止することができる。 Furthermore, in the present invention, it is desirable that a ventilation groove is formed on the joint surface.
In this way, variation in joining is reduced by the escape of air during joining. Further, since the gas generated during welding escapes, it is possible to prevent the lens from being deformed due to the thermal expansion stress of the internal air accompanying the environmental temperature change after welding.

また，本発明の組み合わせレンズの製造方法は，２以上の透明樹脂レンズを組み合わせてなる組み合わせレンズの製造方法であって，少なくとも１つの透明樹脂レンズとして紫外線吸収剤を含有するものを用い，その透明樹脂レンズと他の透明樹脂レンズとを紫外線吸収剤によって吸収され得る光線を照射して溶着させることにより接合するものである。
本発明の組み合わせレンズの製造方法によれば，紫外線吸収能を有する透明樹脂レンズを用いているので，溶着による接合は容易である。 In addition, the method for manufacturing a combination lens according to the present invention is a method for manufacturing a combination lens in which two or more transparent resin lenses are combined, and at least one transparent resin lens containing an ultraviolet absorber is used. The resin lens and another transparent resin lens are bonded together by irradiating and welding a light beam that can be absorbed by the ultraviolet absorber.
According to the method for manufacturing a combination lens of the present invention, since a transparent resin lens having ultraviolet absorbing ability is used, joining by welding is easy.

さらに本発明では，各透明樹脂レンズを，これらの組み合わせ全体を保持する不透明な鏡筒に組み付け，光線照射により，透明樹脂レンズ間の接合箇所と，透明樹脂レンズと鏡筒との接合箇所とをともに溶着することが望ましい。
このようにすれば，この組み合わせレンズの製造は容易である。 Furthermore, in the present invention, each transparent resin lens is assembled to an opaque lens barrel that holds the entire combination, and the joint between the transparent resin lens and the joint between the transparent resin lens and the lens barrel are formed by light irradiation. It is desirable to weld them together.
In this way, it is easy to manufacture this combination lens.

さらに本発明では，光線照射により，１つの透明樹脂レンズの両面の接合箇所を一度に溶着することが望ましい。
このようにすれば，比較的少ない回数の光線照射によって組み合わせレンズを製造できる。 Furthermore, in this invention, it is desirable to weld the joint location of both surfaces of one transparent resin lens at a time by light irradiation.
In this way, a combined lens can be manufactured by a relatively small number of times of light irradiation.

さらに本発明では，溶着のために照射する光線は，紫外線レーザであることが望ましい。
このようにすれば，接合箇所に的確に光線を照射することができる。逆に，溶着のために照射する光線は，紫外線吸収剤によって吸収され得る光線であればよく，必ずしも紫外線でなくてもよい。紫外線吸収剤は，紫外線だけでなく，比較的短波長の可視光線に対しても吸収能を有する場合がある。この場合は，紫外線吸収剤に吸収され得る可視光線を照射しても，溶着させることができる。 Further, in the present invention, it is desirable that the light beam irradiated for welding is an ultraviolet laser.
If it does in this way, a light ray can be irradiated to a junction location exactly. On the other hand, the light beam irradiated for welding may be a light beam that can be absorbed by the ultraviolet absorber, and is not necessarily ultraviolet light. The ultraviolet absorber may have an ability to absorb not only ultraviolet rays but also visible light having a relatively short wavelength. In this case, welding can be performed even by irradiating visible light that can be absorbed by the ultraviolet absorber.

本発明の組み合わせレンズおよびその製造方法によれば，組立作業性が良好で，小型化が可能となっている。   According to the combination lens and the manufacturing method thereof of the present invention, the assembly workability is good and the size can be reduced.

「第１の形態」
以下，本発明を具体化した第１の形態について，添付図面を参照しつつ詳細に説明する。本形態は，複数枚の光学レンズを組み合わせた光学レンズ組に本発明を適用したものである。 "First form"
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to an optical lens set in which a plurality of optical lenses are combined.

本形態の光学レンズ組１は，図１に示すように，透明の樹脂レンズ１１，１２が組み合わされて鏡筒１３に組み付けられたものである。この図では，図中左方が被写体側であり，図中右方に撮像面が配置される。鏡筒１３には，被写体側の中央部に貫通孔１４が設けられている。被写体側からこの貫通孔１４を通過した光は，樹脂レンズ１１，１２を介して撮像面に到達する。   As shown in FIG. 1, the optical lens set 1 according to the present embodiment is a combination of transparent resin lenses 11 and 12 assembled to a lens barrel 13. In this figure, the left side in the figure is the subject side, and the imaging surface is arranged on the right side in the figure. The lens barrel 13 is provided with a through hole 14 at the center on the subject side. Light that has passed through the through hole 14 from the subject side reaches the imaging surface via the resin lenses 11 and 12.

樹脂レンズ１１は，一般的な透明レンズである。この樹脂レンズ１１は，可視領域，紫外領域のいずれにおいても光をよく透過する。樹脂レンズ１２は，透明樹脂に公知の紫外線吸収剤（例えば，ベンゾフェノン系，ベンゾトリアゾール系，フェニルサリシレート系，シアノアクリレート系などの化合物）を含有させて形成されている。この樹脂レンズ１２は，可視領域の光を透過し，紫外領域の光を部分的に吸収する。これらの樹脂レンズ１１，１２では，図１に示すように，中央部分の有効開口部とその外周側に設けられた周辺部とが一体的に形成されている。被写体側から貫通孔１４を通過した光が透過する範囲が各レンズの有効開口部となる。樹脂レンズ１１，１２は，周辺部において互いに接合されている。   The resin lens 11 is a general transparent lens. This resin lens 11 transmits light well both in the visible region and in the ultraviolet region. The resin lens 12 is formed by including a known ultraviolet absorber (for example, a compound such as benzophenone, benzotriazole, phenyl salicylate, or cyanoacrylate) in a transparent resin. The resin lens 12 transmits light in the visible region and partially absorbs light in the ultraviolet region. In these resin lenses 11 and 12, as shown in FIG. 1, an effective opening at a central portion and a peripheral portion provided on the outer peripheral side thereof are integrally formed. A range in which light passing through the through hole 14 from the subject side is transmitted becomes an effective opening of each lens. The resin lenses 11 and 12 are bonded to each other at the peripheral portion.

鏡筒１３は，不透明な樹脂によって略筒状に形成されている。この鏡筒１３は，可視領域と紫外領域との光をともによく吸収する。鏡筒１３は，貫通孔１４の周囲または筒部内面において，樹脂レンズ１１，１２の周辺部に接触できるように形成され，それらの接触箇所において鏡筒１３と樹脂レンズ１１，１２とは接合されている。これにより，樹脂レンズ１１，１２，鏡筒１３は，それらの有効開口部の間に適切な距離をおいて，互いに固定されている。   The lens barrel 13 is formed in a substantially cylindrical shape by an opaque resin. This lens barrel 13 absorbs both visible and ultraviolet light well. The lens barrel 13 is formed so as to be in contact with the peripheral portions of the resin lenses 11 and 12 around the through hole 14 or on the inner surface of the cylinder portion, and the lens barrel 13 and the resin lenses 11 and 12 are joined at the contact portions. ing. Thus, the resin lenses 11 and 12 and the lens barrel 13 are fixed to each other with an appropriate distance between their effective openings.

従って，樹脂レンズ１１の有効開口部と樹脂レンズ１２の有効開口部との間には，図のように所定の空間が形成され，その周囲が接合された状態となっている。そのため，組立時に内部空気の逃げ道が無く組立バラツキが発生したり，溶着時に発生するガスにより樹脂レンズ１１，１２の透明性が失われたり，環境要因や熱等により内部空気が膨張して樹脂レンズ１１，１２が変形したりするおそれがある。そのために，樹脂レンズ１１の所定箇所に通気溝１５が設けられている。この通気溝１５によって，樹脂レンズ１１，１２で囲まれた空間は外部と連通されている。さらに，この通気溝１５により光学レンズ組１内部の結露も防止できる。あるいは，通気溝１５は樹脂レンズ１２に形成されていても良い。   Therefore, a predetermined space is formed between the effective opening of the resin lens 11 and the effective opening of the resin lens 12 as shown in the figure, and the periphery thereof is joined. For this reason, there is no escape path for internal air during assembly, assembly variation occurs, transparency of the resin lenses 11 and 12 is lost due to gas generated during welding, and internal air expands due to environmental factors, heat, etc. 11 and 12 may be deformed. Therefore, a ventilation groove 15 is provided at a predetermined location of the resin lens 11. The space surrounded by the resin lenses 11 and 12 is communicated with the outside by the ventilation groove 15. Further, the ventilation groove 15 can prevent condensation inside the optical lens assembly 1. Alternatively, the ventilation groove 15 may be formed in the resin lens 12.

ここで，樹脂レンズ１２に含有させる紫外線吸収剤の量により，図２に示すように，樹脂レンズ１２の各波長に対する透過率は異なるものとなる。グラフＬ１は，紫外線吸収剤を全く添加していない樹脂レンズ１２の透過率であり，波長３００ｎｍ程度以上の光はほぼ１００％透過する。また，グラフＬ２〜Ｌ４は，いずれも紫外線吸収剤を添加した樹脂レンズ１２であり，その添加量はＬ２＜Ｌ３＜Ｌ４の順に多くなっている。図２に示すように，紫外線吸収剤の添加量が多いほど，波長の長い紫外線を吸収できる。   Here, as shown in FIG. 2, the transmittance of the resin lens 12 with respect to each wavelength varies depending on the amount of the ultraviolet absorber contained in the resin lens 12. Graph L1 is the transmittance of the resin lens 12 to which no ultraviolet absorber is added, and light having a wavelength of about 300 nm or more is transmitted almost 100%. Graphs L2 to L4 are all resin lenses 12 to which an ultraviolet absorber is added, and the amount of addition increases in the order of L2 <L3 <L4. As shown in FIG. 2, the longer the ultraviolet absorber is added, the longer the wavelength of ultraviolet rays can be absorbed.

例えば，図中に一点鎖線で示した波長４１０ｎｍの紫外線を利用した場合，グラフＬ２のタイプでは，ほとんど透過し，グラフＬ３のタイプでは透過率が約５０％であり，グラフＬ４のタイプではほとんど透過しない。この光学レンズ組１では，樹脂レンズ１２としてグラフＬ３のタイプとほぼ同じ添加量の紫外線吸収剤を添加したものを使用している。また，溶着のための紫外線レーザとしては，波長約４１０ｎｍの紫外線を利用する。これにより，紫外線レーザは樹脂レンズ１２によって部分的に吸収される。   For example, when ultraviolet rays having a wavelength of 410 nm indicated by a one-dot chain line in the figure are used, the graph L2 type transmits almost, the graph L3 type transmits about 50%, and the graph L4 type transmits almost. do not do. In this optical lens set 1, a resin lens 12 to which an ultraviolet absorber having the same addition amount as that of the type of the graph L3 is added is used. Further, as an ultraviolet laser for welding, ultraviolet light having a wavelength of about 410 nm is used. As a result, the ultraviolet laser is partially absorbed by the resin lens 12.

次に，このような光学レンズ組１を製造する方法を説明する。まず，樹脂レンズ１１，樹脂レンズ１２，鏡筒１３を，それぞれの材料の樹脂によって形成する。次に，これらを所定の配置に組み合わせ，図３に示すように図中右方向から，樹脂レンズ１１，１２の周辺部に紫外線レーザを照射する。このようにすると，紫外線レーザは，樹脂レンズ１１を透過し，樹脂レンズ１１と樹脂レンズ１２との接合部Ｌ１に到達する。接合部Ｌ１において，樹脂レンズ１２は部分的に紫外線を吸収し，その部分は発熱して溶解される。この熱によって，接合部Ｌ１付近では樹脂レンズ１１も僅かに溶解し，樹脂レンズ１２と溶着される。   Next, a method for manufacturing such an optical lens set 1 will be described. First, the resin lens 11, the resin lens 12, and the lens barrel 13 are formed of resin of each material. Next, these are combined in a predetermined arrangement, and an ultraviolet laser is irradiated to the peripheral portions of the resin lenses 11 and 12 from the right side in the drawing as shown in FIG. If it does in this way, an ultraviolet laser will permeate | transmit the resin lens 11 and will arrive at the junction part L1 of the resin lens 11 and the resin lens 12. FIG. In the joint portion L1, the resin lens 12 partially absorbs ultraviolet rays, and the portion generates heat and is melted. Due to this heat, the resin lens 11 is slightly dissolved in the vicinity of the joint portion L1 and is welded to the resin lens 12.

さらに，紫外線レーザは，少しずつ吸収されながら樹脂レンズ１２中を進み，樹脂レンズ１２に吸収されなかった部分が，樹脂レンズ１２と鏡筒１３との接合部Ｌ２に到達する。鏡筒１３は，紫外線をよく吸収するので，この紫外線レーザによって発熱溶解し，接合部Ｌ２において樹脂レンズ１２と鏡筒１３とが溶着接合される。   Further, the ultraviolet laser advances through the resin lens 12 while being absorbed little by little, and the portion that is not absorbed by the resin lens 12 reaches the joint L2 between the resin lens 12 and the lens barrel 13. Since the lens barrel 13 absorbs ultraviolet rays well, it is heated and melted by the ultraviolet laser, and the resin lens 12 and the lens barrel 13 are welded and joined at the joint L2.

このとき，図４に示すように，周辺部の複数箇所を接合することにより，樹脂レンズ１１と樹脂レンズ１２との間，および樹脂レンズ１２と鏡筒１３との間の接合を確実なものとできる。図４は，図３の右方から見た図である。この図では，貫通孔１４を中心に互いに対称な６箇所に，接合部Ｌ１を設けている。これらの複数の接合部Ｌ１は，複数のレーザヘッドによって同時に接合しても良いし，１つのレーザヘッドで順に接合しても良い。   At this time, as shown in FIG. 4, by joining a plurality of peripheral portions, it is possible to ensure the joining between the resin lens 11 and the resin lens 12 and between the resin lens 12 and the lens barrel 13. it can. 4 is a diagram viewed from the right side of FIG. In this figure, the joint portions L1 are provided at six positions symmetrical about the through hole 14. The plurality of joining portions L1 may be joined simultaneously by a plurality of laser heads, or may be joined sequentially by one laser head.

また，このような紫外線レーザによる接合では，以下のように各種の工夫をすることができる。例えば，樹脂レンズ１２の接合部Ｌ１，Ｌ２に相当する接合面にシボ形状を形成しておき，その部分のレーザ吸収をさらに良好にしても良い。あるいは，樹脂レンズ１１，１２の接合部Ｌ１をともに鏡面に形成し，樹脂同士の密着性を向上させても良い。これによりレーザ光を吸収しない樹脂レンズ１１にもよく熱が伝達し，溶着が確実なものとなる。また，紫外線レーザの照射によって，樹脂レンズ１１，１２のゲートカットも同時に行っても良い。   In addition, in such joining by an ultraviolet laser, various devices can be devised as follows. For example, an embossed shape may be formed on the joint surfaces corresponding to the joint portions L1 and L2 of the resin lens 12, and the laser absorption at those portions may be further improved. Alternatively, both the joint portions L1 of the resin lenses 11 and 12 may be formed on a mirror surface to improve the adhesion between the resins. As a result, heat is well transmitted to the resin lens 11 that does not absorb the laser light, and welding is ensured. In addition, the resin lenses 11 and 12 may be gate-cut simultaneously by irradiation with an ultraviolet laser.

また，樹脂レンズ１１と樹脂レンズ１２との偏芯精度が高精度に要求される場合には，治具等によってこれらの樹脂レンズ１１，１２を精度良く固定しておき，紫外線レーザによってまず接合部Ｌ１のみの接合を行う。その後，接合された樹脂レンズ１１，１２を鏡筒１３に組み込み，接合部Ｌ２の接合を行うと良い。この場合には，接合部Ｌ１と接合部Ｌ２とを同一の位置でなく，接合部Ｌ１の間に接合部Ｌ２を設けるようにすることが好ましい。また，接合部Ｌ２の接合時には，樹脂レンズ１２による吸収量が少ない波長の紫外線レーザを選択することにより，樹脂レンズ１２の変形を防止することもできる。   In addition, when high accuracy is required for the eccentricity between the resin lens 11 and the resin lens 12, the resin lenses 11 and 12 are fixed with a jig or the like with high accuracy, and the bonding portion is first bonded by an ultraviolet laser. Only L1 is joined. Thereafter, the joined resin lenses 11 and 12 may be incorporated into the lens barrel 13 to join the joining portion L2. In this case, it is preferable that the joint portion L1 and the joint portion L2 are not located at the same position but the joint portion L2 is provided between the joint portions L1. Further, when the joining portion L2 is joined, it is possible to prevent the resin lens 12 from being deformed by selecting an ultraviolet laser having a wavelength with a small amount of absorption by the resin lens 12.

また，鏡筒１３に，可視領域の光は遮断し，紫外領域の光は透過するような染料あるいは顔料を混入させれば，光学レンズ組１の外部から鏡筒１３を透過して樹脂レンズ１１，１２に紫外線レーザを照射できる。このようにすれば，被写体側から接合部Ｌ２における鏡筒１３の内面と樹脂レンズ１２との接合を行うこともできる。あるいは，外周側から樹脂レンズ１１と樹脂レンズ１２との接合面に紫外線レーザを照射して，両レンズの接合を行うこともできる。また，紫外線吸収剤は樹脂レンズ１２のうち，接合部Ｌ１，Ｌ２を含む周辺部のみに含有させても良い。   Further, if a dye or pigment that blocks light in the visible region and transmits light in the ultraviolet region is mixed in the lens barrel 13, the resin lens 11 passes through the lens barrel 13 from the outside of the optical lens set 1. , 12 can be irradiated with an ultraviolet laser. In this way, the inner surface of the lens barrel 13 and the resin lens 12 at the joint portion L2 can be joined from the subject side. Alternatively, both lenses can be joined by irradiating the joining surface between the resin lens 11 and the resin lens 12 from the outer peripheral side with an ultraviolet laser. Further, the ultraviolet absorber may be contained only in the peripheral portion including the joint portions L1 and L2 in the resin lens 12.

以上詳細に説明したように，本形態の光学レンズ組１によれば，樹脂レンズ１２に紫外線吸収剤を含有させることにより，樹脂レンズ１１と樹脂レンズ１２との間の接合部Ｌ１や，樹脂レンズ１２と鏡筒１３との間の接合部Ｌ２における接合を紫外線レーザによって行うことができる。従って，組立作業性が良好な光学レンズ組１となっている。   As described in detail above, according to the optical lens set 1 of the present embodiment, the resin lens 12 contains the ultraviolet absorber, so that the joint portion L1 between the resin lens 11 and the resin lens 12 or the resin lens can be obtained. The joining at the joining portion L2 between the lens 12 and the lens barrel 13 can be performed by an ultraviolet laser. Therefore, the optical lens set 1 has good assembly workability.

「第２の形態」
次に，本発明を具体化した第２の形態について，添付図面を参照しつつ詳細に説明する。本形態は，ＣＣＤ等の固体撮像素子を有するカメラ等に用いられる光学レンズ組であり，３枚以上の光学レンズを有する光学レンズ組に本発明を適用したものである。 "Second form"
Next, a second embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present embodiment is an optical lens set used in a camera or the like having a solid-state imaging device such as a CCD, and the present invention is applied to an optical lens set having three or more optical lenses.

本形態の光学レンズ組２は，図５に示すように，３枚の透明な樹脂レンズ２１，２２，２３が組み合わされたものである。この図では，図中左方が被写体側であり，図中右方にＣＣＤ等の撮像素子が配置される。被写体側からこれらの樹脂レンズ２１，２２，２３を通過した光が撮像素子の撮像面に結像する。   As shown in FIG. 5, the optical lens set 2 of this embodiment is a combination of three transparent resin lenses 21, 22, and 23. In this figure, the left side in the figure is the subject side, and an imaging element such as a CCD is arranged on the right side in the figure. Light that has passed through the resin lenses 21, 22, and 23 from the subject side forms an image on the imaging surface of the imaging device.

本形態の光学レンズ組２では，樹脂レンズ２１，２２，２３のいずれかに紫外線吸収剤を含有させる。紫外線吸収剤を含有させるレンズは１つでも複数でも良い。また，この場合の紫外線吸収剤の量は，図２に示したグラフＬ３のものに限らず，適宜調整すればよい。   In the optical lens set 2 of this embodiment, an ultraviolet absorber is contained in one of the resin lenses 21, 22, and 23. There may be one lens or a plurality of lenses containing the ultraviolet absorber. Further, the amount of the ultraviolet absorber in this case is not limited to that of the graph L3 shown in FIG.

ここで，樹脂レンズ２１，２２，２３のいずれに紫外線吸収剤を含有させるかについては，各種の条件を考慮して決定されればよい。例えば，最も体積の小さい樹脂レンズ２１に紫外線吸収剤を含有させることとすれば，その混入させる紫外線吸収剤の量を最小とすることができる。また，中央に配置される樹脂レンズ２２に紫外線吸収剤を含有させることとすれば，樹脂レンズ２１側と樹脂レンズ２３側の両側からのレーザ照射によって，同時に両側の樹脂レンズ２１，２３と接合させることが可能となる。また，最も撮像素子に近い位置に配置される樹脂レンズ２３に紫外線吸収剤を含有させることとすれば，このレンズ組２による光量の低下が最小限に抑えられる。   Here, which of the resin lenses 21, 22 and 23 should contain the ultraviolet absorber may be determined in consideration of various conditions. For example, if the resin lens 21 having the smallest volume is made to contain an ultraviolet absorber, the amount of the ultraviolet absorber to be mixed can be minimized. If the resin lens 22 arranged in the center contains an ultraviolet absorber, the resin lenses 21 and 23 on both sides are simultaneously bonded by laser irradiation from both sides of the resin lens 21 side and the resin lens 23 side. It becomes possible. Further, if the resin lens 23 arranged closest to the image pickup element contains an ultraviolet absorber, a decrease in the amount of light due to the lens set 2 can be minimized.

このレンズ組２では，樹脂レンズ２１，２２，２３のいずれかにより紫外線が吸収されるので，別部材を挟み込む必要はなく，光学レンズ２全体としての小型化が可能となっている。また，本形態の光学レンズ組２と第１の形態の光学レンズ組１とを併用して実施することもできる。また，１枚のレンズのみに紫外線吸収剤を含有させる代わりに，含有させる紫外線吸収剤の量を変えて，あるいは吸収する波長の異なる紫外線吸収剤を複数の樹脂レンズにそれぞれ含有させて，それぞれのレンズを形成しても良い。このようにすれば，溶着時に波長の異なる紫外線を照射することで，それぞれ希望の箇所のみの溶着をすることもできる。   In this lens set 2, ultraviolet rays are absorbed by any one of the resin lenses 21, 22, and 23, so there is no need to sandwich another member, and the entire optical lens 2 can be reduced in size. Further, the optical lens set 2 of the present embodiment and the optical lens set 1 of the first embodiment can be used in combination. Also, instead of containing the UV absorber in only one lens, the amount of the UV absorber to be included is changed, or UV absorbers having different wavelengths to be absorbed are respectively contained in a plurality of resin lenses. A lens may be formed. In this way, it is possible to weld only desired portions by irradiating ultraviolet rays having different wavelengths at the time of welding.

以上詳細に説明したように，本形態の光学レンズ組２によれば，樹脂レンズ２１，２２，２３のいずれかによって紫外線が吸収されるので，別部材を挟み込む必要はない。従って，小型化が可能な光学レンズ組２となっている。   As described above in detail, according to the optical lens set 2 of the present embodiment, ultraviolet rays are absorbed by any one of the resin lenses 21, 22, and 23, so there is no need to sandwich another member. Therefore, the optical lens set 2 can be miniaturized.

なお，上記の各形態は単なる例示にすぎず，本発明を何ら限定するものではない。したがって本発明は当然に，その要旨を逸脱しない範囲内で種々の改良，変形が可能である。
例えば，上記の各形態に示した各レンズや鏡筒の形状や個数は一例であり，用途等に応じて適宜変更可能である。
また例えば，接合部Ｌ１，Ｌ２の配置や個数も適宜変更可能である。また，紫外線レーザを照射しつつレーザヘッドを円周状に移動させてもよい。
また例えば，溶着のために照射する光線は，紫外線吸収剤によって吸収される光線であればよく，必ずしも紫外線レーザでなくても良い。
また例えば，各レンズのいずれかに赤外線を吸収する吸収剤をさらに含有させれば，そのレンズによって赤外線カットフィルタの機能をも兼ねさせることができる。このようにすれば，赤外線カットフィルタが不要となるので，さらなる小型化が可能となる。 In addition, each said form is only a mere illustration and does not limit this invention at all. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.
For example, the shape and number of lenses and lens barrels shown in the above embodiments are merely examples, and can be changed as appropriate according to the application.
Further, for example, the arrangement and the number of the joint portions L1 and L2 can be changed as appropriate. Alternatively, the laser head may be moved circumferentially while irradiating with an ultraviolet laser.
Further, for example, the light beam irradiated for welding may be a light beam absorbed by the ultraviolet absorber, and is not necessarily an ultraviolet laser.
In addition, for example, if an absorbing agent that absorbs infrared rays is further contained in any of the lenses, the lens can also function as an infrared cut filter. In this way, since an infrared cut filter is not necessary, further miniaturization is possible.

本形態に係る光学レンズ組を示す概略断面図である。It is a schematic sectional drawing which shows the optical lens group which concerns on this form. レンズに添加する紫外線吸収剤の量と透過率との関係を示すグラフである。It is a graph which shows the relationship between the quantity of the ultraviolet absorber added to a lens, and the transmittance | permeability. レーザ接合方法を示す説明図である。It is explanatory drawing which shows the laser joining method. レーザ接合方法を示す説明図である。It is explanatory drawing which shows the laser joining method. 第２の形態の光学レンズ組を示す概略断面図である。It is a schematic sectional drawing which shows the optical lens group of a 2nd form.

符号の説明Explanation of symbols

１，２ 光学レンズ組（組み合わせレンズ）
１１，１２，２１，２２，２３ 樹脂レンズ（透明樹脂レンズ）
１３ 鏡筒
１５ 通気溝 1, 2 Optical lens set (combination lens)
11, 12, 21, 22, 23 Resin lens (transparent resin lens)
13 Lens tube 15 Ventilation groove

Claims (7)

２以上の透明樹脂レンズを組み合わせてなる組み合わせレンズにおいて，
少なくとも１つの透明樹脂レンズが紫外線吸収剤を含有し，
その透明樹脂レンズと他の透明樹脂レンズとが溶着により接合されていることを特徴とする組み合わせレンズ。 In a combination lens formed by combining two or more transparent resin lenses,
At least one transparent resin lens contains an ultraviolet absorber;
A combination lens, wherein the transparent resin lens and another transparent resin lens are bonded together by welding. 請求項１に記載の組み合わせレンズにおいて，
透明樹脂レンズの組み合わせ全体を保持する不透明な鏡筒を有し，
透明樹脂レンズの１つと前記鏡筒とが溶着により接合されていることを特徴とする組み合わせレンズ。 The combination lens according to claim 1,
It has an opaque lens barrel that holds the entire combination of transparent resin lenses,
A combination lens, wherein one of the transparent resin lenses and the lens barrel are joined by welding. 請求項１または請求項２に記載の組み合わせレンズにおいて，
接合面に通気溝が形成されていることを特徴とする組み合わせレンズ。 The combination lens according to claim 1 or 2,
A combination lens, wherein a ventilation groove is formed on a joint surface. ２以上の透明樹脂レンズを組み合わせてなる組み合わせレンズの製造方法において，
少なくとも１つの透明樹脂レンズとして紫外線吸収剤を含有するものを用い，
その透明樹脂レンズと他の透明樹脂レンズとを前記紫外線吸収剤によって吸収され得る光線を照射して溶着させることにより接合することを特徴とする組み合わせレンズの製造方法。 In the manufacturing method of a combination lens formed by combining two or more transparent resin lenses,
Use at least one transparent resin lens containing an ultraviolet absorber,
A method of manufacturing a combination lens, comprising joining the transparent resin lens and another transparent resin lens by irradiating and welding a light beam that can be absorbed by the ultraviolet absorber. 請求項４に記載の組み合わせレンズの製造方法において，
各透明樹脂レンズを，これらの組み合わせ全体を保持する不透明な鏡筒に組み付け，
光線照射により，透明樹脂レンズ間の接合箇所と，透明樹脂レンズと鏡筒との接合箇所とをともに溶着することを特徴とする組み合わせレンズの製造方法。 In the manufacturing method of the combination lens of Claim 4,
Each transparent resin lens is assembled into an opaque lens barrel that holds the entire combination.
A method for manufacturing a combination lens, characterized in that a joint between a transparent resin lens and a joint between a transparent resin lens and a lens barrel are welded together by light irradiation. 請求項４に記載の組み合わせレンズの製造方法において，
光線照射により，１つの透明樹脂レンズの両面の接合箇所を一度に溶着することを特徴とする組み合わせレンズの製造方法。 In the manufacturing method of the combination lens of Claim 4,
A method for manufacturing a combination lens, characterized in that joints on both sides of one transparent resin lens are welded at a time by light irradiation. 請求項４から請求項６までのいずれか１つに記載の組み合わせレンズの製造方法において，
前記溶着のために照射する光線は，紫外線レーザであることを特徴とする組み合わせレンズの製造方法。 In the manufacturing method of the combination lens as described in any one of Claim 4-6,
The method of manufacturing a combined lens, wherein the light beam irradiated for welding is an ultraviolet laser.
JP2004192785A 2004-03-31 2004-06-30 Method for manufacturing a combination lens Expired - Fee Related JP4815760B2 (en)

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