JP4241473B2 - Method for manufacturing a combination lens - Google Patents

Method for manufacturing a combination lens Download PDF

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Publication number
JP4241473B2
JP4241473B2 JP2004106849A JP2004106849A JP4241473B2 JP 4241473 B2 JP4241473 B2 JP 4241473B2 JP 2004106849 A JP2004106849 A JP 2004106849A JP 2004106849 A JP2004106849 A JP 2004106849A JP 4241473 B2 JP4241473 B2 JP 4241473B2
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lens
transparent resin
infrared
resin
lenses
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JP2005292441A (en
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真嘉 上平
朗彦 松本
克司 渡邊
利行 真島
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Konica Minolta Opto Inc
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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
    • B29C65/16—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
    • 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
    • B29C66/114—Single butt 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
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • 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
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
    • B29C65/7814—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of inter-cooperating positioning features, e.g. tenons and mortises
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination lens which has proper workability of assembling and can be miniaturized, and to provide a manufacturing method thereof. <P>SOLUTION: An optical lens assembly 1 is a combination lens obtained, by combining two or more transparent resin lenses 11 and 12, and at least one transparent resin lens 12 has infrared absorbing capabilities. and this transparent resin lens 12 and another transparent resin lens 11 are joined by welding. An opaque lens barrel 13 is provided which holds the entire combination of transparent resin lenses 11 and 12, and it is preferable that the transparent resin lens 12 and the lens barrel 13 be jointed by welding. It is preferable that an air groove 15 be formed in the junction surface between transparent resin lenses 11 and 12. <P>COPYRIGHT: (C)2006,JPO&amp;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の製造方法に関するものである。 The present invention relates to a method for producing a combination lens that combines a plurality of transparent resin lens. More particularly, it relates to a method for manufacturing a combination lens in which a plurality of resin lenses are held in a lens barrel to cover them.

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２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２００３−１８１９３１号公報 特開平７−９２３０１号公報 On the other hand, Patent Document 1 discloses a bonding method by irradiating a laser beam with a thin infrared absorbing transparent film sandwiched between transparent resin members. Patent Document 2 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 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，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 used for a small camera such as a mobile phone, the work of sandwiching the infrared absorbing transparent film is not easy, and there is a possibility that the assembling workability may be deteriorated.

また，ＣＣＤ等の固体撮像素子は，一般に，可視光線領域以外に赤外線領域にも感度を有し，赤外線がノイズの原因となる。そのため，ＣＣＤ等を使用するカメラ用の組み合わせレンズでは，固体撮像素子より被写体側に赤外線カットフィルタを挿入していた。このことから，組み合わせレンズが全体として大型化するという問題点もあった。   In addition, a solid-state imaging device such as a CCD generally has sensitivity not only in the visible light region but also in the infrared region, and infrared light causes noise. For this reason, in a combination lens for a camera using a CCD or the like, an infrared cut filter is inserted on the subject side from the solid-state imaging device. Therefore, there is a problem that the combined lens is enlarged as a whole.

本発明は，前記した従来の組み合わせレンズ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の製造方法を提供することにある。 The present invention has been made to solve the problems the conventional method of manufacturing a combination lens described above has. That it is an object, the assembling workability is good, there is provided a method for manufacturing a miniaturized possible combinations lens.

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赤外線吸収剤を含有するものを用い，その透明樹脂レンズの周縁部と他の透明樹脂レンズの周縁部との接合部に赤外線を，一方の透明樹脂レンズを透過して接合部に至るように照射して溶着させることにより，当該２つの透明樹脂レンズを接合し，接合された透明樹脂レンズを鏡筒へ組み込み，透明樹脂レンズと鏡筒との接合部に赤外線を，透明樹脂レンズを透過して接合部に至るように照射して溶着させることにより，透明樹脂レンズと鏡筒とを接合するものである。 A manufacturing method of a combination lens made for the purpose of solving this problem is a manufacturing method of a combination lens in which two or more transparent resin lenses are combined, and includes an infrared absorber as at least one transparent resin lens. Infrared light is applied to the joint between the peripheral edge of the transparent resin lens and the peripheral edge of the other transparent resin lens, and is irradiated and welded through one transparent resin lens to reach the joint. Two transparent resin lenses are joined, the joined transparent resin lens is incorporated into the lens barrel, infrared light is transmitted to the joint between the transparent resin lens and the lens barrel, and the transparent resin lens is irradiated to reach the joint. By welding, the transparent resin lens and the lens barrel are joined.

本発明の組み合わせレンズの製造方法によれば，赤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。   According to the method for manufacturing a combination lens of the present invention, since a transparent resin lens having infrared absorbing ability is used, joining by welding is easy.

さらに，本発明の製造方法によって製造された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。さらに，少なくとも１つの透明樹脂レンズが赤外線吸収能を有するので，その透明樹脂レンズによって赤外線を吸収させることができ，赤外線吸収透明フィルムを挟んだりコーティングしたりする必要はない。さらに，この組み合わせレンズによって赤外線をカットでき，ＣＣＤ等を有するカメラに用いられる場合でも赤外線カットフィルタを挿入する必要はない。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。 Furthermore, according to the combination lens manufactured by the manufacturing method 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. Become. Furthermore, since at least one transparent resin lens has infrared absorption ability, infrared rays can be absorbed by the transparent resin lens, and it is not necessary to sandwich or coat the infrared absorption transparent film. Furthermore, infrared rays can be cut by this combination lens, and even when used in a camera having a CCD or the like, there is no need to insert an infrared cut filter. Therefore, it is a combination lens that has good assembly workability and can be miniaturized.

さらに本発明では，溶着のために照射する赤外線は，赤外線レーザであることが望ましい。
このようにすれば，接合箇所に的確に赤外線を照射することができる。 Furthermore, in the present invention, it is desirable that the infrared ray irradiated for welding is an infrared laser.
If it does in this way, infrared rays can be accurately irradiated to a joined part.

さらに本発明では，透明樹脂レンズと鏡筒とを接合するときに照射する赤外線は，透明樹脂レンズ同士を接合するときに照射する赤外線に比して，樹脂レンズによる吸収量が少ない波長のものであることが望ましい。Furthermore, in the present invention, the infrared ray irradiated when the transparent resin lens and the lens barrel are bonded has a wavelength with less absorption by the resin lens than the infrared ray irradiated when the transparent resin lenses are bonded. It is desirable to be.

さらに本発明では，透明樹脂レンズと鏡筒とを接合するときには，透明樹脂レンズ同士を接合するときに赤外線を照射した位置と異なる位置に赤外線を照射することが望ましい。 Furthermore, in the present invention, when the transparent resin lens and the lens barrel are bonded, it is desirable to irradiate infrared rays at a position different from the position where the infrared resin is irradiated when the transparent resin lenses are bonded .

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，赤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，透明樹脂に公知の赤外線吸収剤（例えば，前述の特許文献２に記載されているもの）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，赤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. The resin lens 11 transmits light well both in the visible region and in the infrared region. The resin lens 12 is formed by including a known infrared absorber (for example, one described in Patent Document 2) in a transparent resin. The resin lens 12 transmits light in the visible region and partially absorbs light in the infrared region. In these resin lenses 11 and 12, as shown in FIG. 1, the effective opening at the central portion and the 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 is 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，可視領域と赤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. The lens barrel 13 absorbs both visible and infrared 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.

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２に示すように図中右方向から，樹脂レンズ１１，１２の周辺部に赤外線レーザを照射する。このようにすると，赤外線レーザは，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は部分的に赤外線を吸収し，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 infrared laser is irradiated to the peripheral portions of the resin lenses 11 and 12 from the right direction in the drawing as shown in FIG. If it does in this way, an infrared 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 infrared 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，赤外線レーザは，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，赤外線をよく吸収するので，この赤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 infrared laser proceeds 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 infrared rays well, it is heated and melted by the infrared laser, and the resin lens 12 and the lens barrel 13 are welded and joined at the joint portion L2.

このとき，図３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３は，図２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. 3, 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. FIG. 3 is a view 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，このような赤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，赤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 infrared 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. Moreover, the resin lenses 11 and 12 may be gate-cut simultaneously by irradiation with an infrared 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，赤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赤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 an infrared laser firstly joins the joint portion. 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, the resin lens 12 can be prevented from being deformed by selecting an infrared 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，赤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に赤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との接合面に赤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，赤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 infrared region is mixed in the lens barrel 13, the lens 13 is transmitted from the outside of the optical lens set 1 to the resin lens. 11 and 12 can be irradiated with an infrared 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, the two 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 infrared laser. Further, the infrared 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に赤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における接合を赤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 an infrared absorber, so that the joint 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 infrared 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４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. 4, the optical lens set 2 of the present 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のいずれかの有効開口部に赤外線吸収剤を含有させる。このようにすることにより，この光学レンズ組２に入射された光のうち赤外線部分は，撮像素子に到達するまでの間に樹脂レンズ２１，２２，２３によって吸収される。従って，赤外線カットフィルタを有しなくても，赤外線によるノイズは除去される。赤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。   In the optical lens set 2 of this embodiment, an infrared absorber is contained in any one of the effective openings of the resin lenses 21, 22, and 23. By doing so, the infrared portion of the light incident on the optical lens set 2 is absorbed by the resin lenses 21, 22 and 23 before reaching the image sensor. Therefore, noise due to infrared rays can be removed without having an infrared cut filter. There may be one or a plurality of lenses containing the infrared absorber.

ここで，樹脂レンズ２１，２２，２３のいずれに赤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に赤外線吸収剤を含有させることとすれば，その混入させる赤外線吸収剤の量を最小とすることができる。また，有効開口部でのレンズ厚が最も大きい樹脂レンズ２２に赤外線吸収剤を含有させることとすれば，光学レンズ組２による赤外線の吸収性を良好なものとすることができる。   Here, which of the resin lenses 21, 22, and 23 contains the infrared absorber may be determined in consideration of various conditions. For example, if an infrared absorber is contained in the resin lens 21 having the smallest volume, the amount of the infrared absorber to be mixed can be minimized. Moreover, if the resin lens 22 having the largest lens thickness at the effective opening contains an infrared absorber, the infrared absorption by the optical lens set 2 can be improved.

また，中央に配置される樹脂レンズ２２に赤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に赤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。また，最も被写体側に配置される樹脂レンズ２１に赤外線吸収剤を含有させることとすれば，光学レンズ組２内部での赤外線の散乱が防止され，撮像素子に到達する前に赤外線を効率よく除去できる。   If the resin lens 22 arranged in the center contains an infrared 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. In addition, if the resin lens 23 arranged closest to the image sensor contains an infrared absorber, a decrease in the amount of light due to the lens set 2 can be minimized. Further, if an infrared absorber is included in the resin lens 21 arranged closest to the subject side, scattering of infrared rays inside the optical lens group 2 is prevented, and infrared rays are efficiently removed before reaching the image sensor. it can.

このレンズ組２では，樹脂レンズ２１，２２，２３のいずれかにより赤外線が吸収されるので，固体撮像素子を利用したカメラに用いられる場合であっても，赤外線カットフィルタを設ける必要はなく，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枚のレンズですべての赤外線を吸収させる代わりに，吸収する波長の異なる赤外線吸収剤を複数の樹脂レンズにそれぞれ含有させて，広い帯域幅の赤外線を吸収可能なようにしても良い。   In this lens set 2, infrared rays are absorbed by any of the resin lenses 21, 22, and 23, so that it is not necessary to provide an infrared cut filter even when used in a camera using a solid-state imaging device. The lens 2 as a whole can be downsized. 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. Further, instead of absorbing all infrared rays with a single lens, infrared absorbers having different absorption wavelengths may be included in a plurality of resin lenses, respectively, so that infrared rays with a wide bandwidth can be absorbed.

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赤外線が吸収されるので，赤外線カットフィルタが不要となる。従って，固体撮像素子を有するカメラにおいても小型化が可能な光学レンズ組２となっている。   As described in detail above, according to the optical lens set 2 of the present embodiment, infrared rays are absorbed by any one of the resin lenses 21, 22, and 23, so that an infrared cut filter is not necessary. Therefore, the optical lens set 2 can be downsized even in a camera having a solid-state imaging device.

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，赤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，赤外線吸収剤によって吸収される赤外線であればよく，必ずしも赤外線レーザでなくても良い。 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. Further, the laser head may be moved circumferentially while irradiating the infrared laser.
Further, for example, the light beam irradiated for welding may be an infrared ray that is absorbed by an infrared absorbent, and is not necessarily an infrared laser.

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 (4)

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赤外線吸収剤を含有するものを用い，
その透明樹脂レンズの周縁部と他の透明樹脂レンズの周縁部との接合部に赤外線を，一方の透明樹脂レンズを透過して接合部に至るように照射して溶着させることにより，当該２つの透明樹脂レンズを接合し，
接合された透明樹脂レンズを鏡筒へ組み込み，透明樹脂レンズと鏡筒との接合部に赤外線を，透明樹脂レンズを透過して接合部に至るように照射して溶着させることにより，透明樹脂レンズと鏡筒とを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,
With those containing an infrared absorbent as at least one transparent resin lens,
Infrared at the junction of the peripheral edge portion of the peripheral edge and the other transparent resin lens of the transparent resin lens, by welding by irradiating to reach the joint passes through the one of the transparent resin lens, the two Bonding a transparent resin lens ,
A transparent resin lens is assembled by incorporating a bonded transparent resin lens into a lens barrel and irradiating infrared rays at the joint between the transparent resin lens and the lens barrel so as to pass through the transparent resin lens and reach the joint. And a lens barrel are joined together . 請求項１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赤外線は，赤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 of Claim 1 ,
The method for manufacturing a combined lens, wherein the infrared rays irradiated for the welding are infrared lasers. 請求項１または請求項２に記載の組み合わせレンズの製造方法において，In the manufacturing method of the combination lens of Claim 1 or Claim 2,
透明樹脂レンズと鏡筒とを接合するときに照射する赤外線は，透明樹脂レンズ同士を接合するときに照射する赤外線に比して，透明樹脂レンズによる吸収量が少ない波長のものであることを特徴とする組み合わせレンズの製造方法。The infrared rays irradiated when the transparent resin lens and the lens barrel are bonded are of a wavelength that absorbs less by the transparent resin lens than the infrared rays irradiated when the transparent resin lenses are bonded. A method for manufacturing a combination lens. 請求項１から請求項３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，In the manufacturing method of the combination lens as described in any one of Claim 1- Claim 3,
透明樹脂レンズと鏡筒とを接合するときには，透明樹脂レンズ同士を接合するときに赤外線を照射した位置と異なる位置に赤外線を照射することを特徴とする組み合わせレンズの製造方法。A method for manufacturing a combination lens, wherein when a transparent resin lens and a lens barrel are bonded, infrared light is irradiated to a position different from a position where the infrared resin is irradiated when the transparent resin lenses are bonded to each other.
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