JP4779315B2 - Lens unit manufacturing method - Google Patents

Lens unit manufacturing method Download PDF

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JP4779315B2
JP4779315B2 JP2004191182A JP2004191182A JP4779315B2 JP 4779315 B2 JP4779315 B2 JP 4779315B2 JP 2004191182 A JP2004191182 A JP 2004191182A JP 2004191182 A JP2004191182 A JP 2004191182A JP 4779315 B2 JP4779315 B2 JP 4779315B2
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lens
resin
lenses
lens barrel
optical
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JP2006011234A (en
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真嘉 上平
克司 渡邊
朗彦 松本
泰介 大柳
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
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1645—Laser beams characterised by the way of heating the interface heating both sides of the joint, e.g. by using two lasers or a split beam
    • 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
    • B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
    • B29C65/1667—Laser beams characterised by the way of heating the interface making use of several radiators at the same time, i.e. simultaneous laser 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
    • B29C66/01—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
    • B29C66/112—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
    • B29C66/10—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
    • B29C66/50—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
    • 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
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • 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

Description

本発明は，複数枚の透明樹脂レンズを組み合わせたレンズユニット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レンズユニットの製造方法に関するものである。 The present invention relates to a method of manufacturing a lens unit that combines a plurality of transparent resin lens. More particularly, a method for producing a plurality of resin lenses the lens unit held by the 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，複数の樹脂レンズが組み合わされて使用されることが多い。一般的に，このような組み合わせレンズでは，それぞれ鏡筒に固定されたりレンズ同士で固定されたりして，各レンズを所定の位置関係に保持するようにしている。そのために，各樹脂レンズには，有効領域の外側に接合のための領域が一体的に形成され，その部分において，例えば接着剤や超音波ウェルダを利用した接合を行っていた。   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. Generally, in such a combination lens, each lens is fixed to a lens barrel or fixed to each other so as to hold each lens in a predetermined positional relationship. For this purpose, each resin lens is integrally formed with an area for bonding outside the effective area, and bonding is performed using, for example, an adhesive or an ultrasonic welder.

これに対し，特許文献１，２には，レーザ光を利用した樹脂材料の接合方法が開示されている。これらの技術では，レーザ光を吸収する樹脂部材とレーザ光を透過する樹脂部材とを重ね合わせ，レーザ光を透過する樹脂部材側からレーザ光を照射する。すると，レーザ光はレーザ光を吸収する樹脂部材に到達して吸収されることにより，その照射部分が加熱され，両側の樹脂部材が溶け合って溶着接合される。また，特許文献３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。
特開昭６０−２１４９３１号公報 特公平５−４２３３６号公報 特開２００３−１８１９３１号公報 On the other hand, Patent Documents 1 and 2 disclose a resin material bonding method using laser light. In these techniques, a resin member that absorbs laser light and a resin member that transmits laser light are overlapped, and laser light is irradiated from the resin member side that transmits laser light. Then, the laser beam reaches the resin member that absorbs the laser beam and is absorbed, whereby the irradiated portion is heated, and the resin members on both sides are melted and welded together. Patent Document 3 discloses a joining method by irradiating a laser beam with a thin infrared absorbing transparent film sandwiched between transparent resin members.
JP-A-60-214931 Japanese Patent Publication No. 5-42336 JP 2003-181931 A

しかしながら，前記した従来のレンズユニット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，接着剤の硬化時の収縮によってレンズが移動し，所定の位置関係から位置ズレが発生するおそれがあった。その場合には，組み合わせレンズとしての光学性能が低下するという問題点があった。また，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等に制約があった。   However, the above-described conventional lens unit has the following problems. First, in the bonding method using an adhesive, it takes time to apply and cure the adhesive. In addition, the lens may move due to the shrinkage when the adhesive is cured, and there is a possibility that the positional deviation occurs from a predetermined positional relationship. In that case, there was a problem that the optical performance as a combination lens deteriorated. In addition, in the joining method using an ultrasonic welder, since it is necessary to hold down with a horn, there are restrictions on the shape and size of the lens.

これに対して，レーザ光による接合方法であればこれらの問題点を回避できると考えられる。しかし，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，各レンズの位置決め精度が高精度に要求されるとともに，鏡筒で覆われた形状となることが多いため，溶着のためにレーザ光を照射する箇所の設定は容易ではなかった。また，接合部材の間に赤外線吸収透明フィルム等を挟んでレーザ溶着する技術では，組立工程および部品点数が増加するという問題点があった。   On the other hand, it is considered that these problems can be avoided by a joining method using laser light. However, in small combination lenses used for small cameras such as mobile phones, positioning accuracy of each lens is required to be high, and the shape is often covered with a lens barrel. It was not easy to set the location where the laser beam was irradiated. In addition, in the technique of laser welding with an infrared absorbing transparent film or the like sandwiched between joining members, there is a problem that the assembly process and the number of parts increase.

本発明は，前記した従来のレンズユニット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，組立作業が容易で，高精度に位置決めされたレンズ配置が得られるレンズユニット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 of the conventional lens unit and the manufacturing method thereof. That it is an object is easy to assembly work is to provide a method of manufacturing a lens unit in which the lens arrangement is positioned with high accuracy can be obtained.

この課題の解決を目的としてなされた本発明のレンズユニットの製造方法は，第１および第２の透明樹脂レンズを鏡筒に組み付けてなるレンズユニットの製造方法であって，鏡筒として，内側へ向けて突出する鍔部が形成されているとともに，鍔部の表面（おもてめん）が，第１の透明樹脂レンズを軸方向に位置決めして固定する第１の基準面とされており，鍔部の裏面が，第２の透明樹脂レンズを軸方向に位置決めして固定する第２の基準面とされているものを用い，第１の透明樹脂レンズとして，第１の基準面と接する第１の固定面が形成されているものを用い，第２の透明樹脂レンズとして，第２の基準面と接する第２の固定面が形成されているものを用い，第１の固定面と第１の基準面との当接部，および第２の固定面と第２の基準面との当接部にレーザ光を照射して溶着する製造方法である。
本発明のレンズユニットの製造方法によれば，鏡筒の基準面と透明樹脂レンズの固定面とが接触されることにより，透明樹脂レンズの位置決めがなされている状態で溶着される。従って，高精度な位置決め状態が維持されて固定される。 The lens unit manufacturing method of the present invention, which has been made for the purpose of solving this problem, is a lens unit manufacturing method in which the first and second transparent resin lenses are assembled to a lens barrel. A flange portion projecting toward the surface is formed, and the surface of the flange portion is a first reference surface for positioning and fixing the first transparent resin lens in the axial direction; The back surface of the collar portion is used as a second reference surface for positioning and fixing the second transparent resin lens in the axial direction, and the first transparent resin lens is in contact with the first reference surface. The first fixing surface and the first fixing surface are used as the second transparent resin lens, and the second fixing surface that is in contact with the second reference surface is used as the second transparent resin lens. Abutting part with the reference surface, and the second fixed surface and the second reference By irradiating a laser beam to the contact portion between a manufacturing method for welding.
According to the lens unit manufacturing method of the present invention, the reference surface of the lens barrel and the fixed surface of the transparent resin lens are brought into contact with each other, so that the transparent resin lens is welded while being positioned. Therefore, a highly accurate positioning state is maintained and fixed.

本発明のレンズユニットの製造方法はさらに，鏡筒と第１の透明樹脂レンズとの組み合わせとして，第１の基準面および第１の固定面の溶着箇所の一方に窪みが形成されているものを用い，窪みの部分にレーザ光を照射して溶着するものである。 Production how of the lens unit of the present invention further as a combination of the barrel and the first transparent resin lens, depression in hand of bonded portion of the first reference surface and the first fixing surface is formed Using a material , the laser beam is irradiated to the indented portion and welded .

また本発明のレンズユニットの製造方法では，第１および第２の透明樹脂レンズとして，有効領域とその外部に設けられたコバ部とを有し，固定面がコバ部に形成されているものを用いることが好ましい。 In the manufacturing method of the lens unit or the present invention, as the first and second transparent resin lens, and a flange portion provided effective area and its outside, which fixing surface is formed on the edge portion Is preferably used.

本発明のレンズユニットの製造方法によれば，組立作業が容易で，高精度に位置決めされたレンズ配置が得られる。 According to the lens unit producing method of the present invention, it is easy to assembly operations, the lens arrangement is obtained which is positioned with high accuracy.

「実施の形態」
以下，本発明を具体化した実施の形態について，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。 "Embodiment"
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below 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１１，１２，１３が組み合わされて鏡筒１４に組み付けられたものである。この図および以下に示す同様の概略断面図では，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。以下では，被写体側を前方（あるいは前面），撮像側を後方（あるいは後面）という。   As shown in FIG. 1, the optical lens set 1 of this embodiment is a combination of transparent resin lenses 11, 12, and 13 and is assembled to a lens barrel 14. In this figure and similar schematic cross-sectional views shown below, the left side in the figure is the subject side, and the imaging surface is arranged on the right side in the figure. Hereinafter, the subject side is referred to as the front (or front), and the imaging side is referred to as the rear (or rear).

樹脂レンズ１１，１２，１３は，熱可塑性透明樹脂によってそれぞれ適切な形状に成形された一般的な透明レンズである。いずれも，光軸中心近傍の有効領域１１ａ，１２ａ，１３ａの外周に接合や位置決めのためのコバ部１１ｂ，１２ｂ，１３ｂが設けられている。これらの樹脂レンズ１１，１２，１３は，可視光に対して透明であり，レーザ光もよく透過する。   The resin lenses 11, 12, and 13 are general transparent lenses that are each molded into an appropriate shape using a thermoplastic transparent resin. In any case, edge portions 11b, 12b, and 13b for bonding and positioning are provided on the outer periphery of the effective regions 11a, 12a, and 13a in the vicinity of the optical axis center. These resin lenses 11, 12, and 13 are transparent to visible light and transmit laser light well.

一方，鏡筒１４は，熱可塑性有色樹脂によって形成されたものであり，可視光を遮断し，レーザ光も吸収する。鏡筒１４は略筒状であり，その内周側には，内周面から延設されたドーナツ板状の鍔部１４ａと，それより後方の内周面に形成された段差部１４ｂとが設けられている。鍔部１４ａは，樹脂レンズ１１のコバ部１１ｂの後面をほぼ覆っている。従って，被写体側からこの光学レンズ組１に入射され，コバ部１１ｂを透過した光は，鍔部１４ａによって吸収され，より後方の撮像面には達することができない。すなわち，鍔部１４ａは有効領域外に入射した光の撮像面への侵入を規制する光路規制作用を有している。   On the other hand, the lens barrel 14 is formed of a thermoplastic colored resin, blocks visible light, and absorbs laser light. The lens barrel 14 has a substantially cylindrical shape, and on its inner peripheral side, a donut plate-like flange portion 14a extending from the inner peripheral surface and a stepped portion 14b formed on the inner peripheral surface behind it. Is provided. The flange portion 14 a substantially covers the rear surface of the edge portion 11 b of the resin lens 11. Therefore, the light incident on the optical lens set 1 from the subject side and transmitted through the edge portion 11b is absorbed by the collar portion 14a and cannot reach the rear imaging surface. That is, the collar portion 14a has an optical path regulating action that regulates intrusion of light incident outside the effective area into the imaging surface.

この光学レンズ組１では，図１に示すように，樹脂レンズ１１のコバ部１１ｂの後面は，そのほとんどが鍔部１４ａの前面に当接されている。また，樹脂レンズ１２のコバ部１２ｂの前面には，接合用の凸部が設けられて，鍔部１４ａの後面に当接されている。樹脂レンズ１１，１２は，これらの当接部において光軸方向の位置決めがなされている。さらに，樹脂レンズ１１，１２の側面部は，少なくともその一部が鏡筒１４の内側面部に当接されて，光軸に垂直な方向の位置決めがされている。   In this optical lens set 1, as shown in FIG. 1, most of the rear surface of the edge portion 11b of the resin lens 11 is in contact with the front surface of the flange portion 14a. Further, a convex portion for bonding is provided on the front surface of the edge portion 12b of the resin lens 12, and is in contact with the rear surface of the flange portion 14a. The resin lenses 11 and 12 are positioned in the optical axis direction at these contact portions. Further, at least a part of the side surface portions of the resin lenses 11 and 12 are brought into contact with the inner side surface portion of the lens barrel 14 to be positioned in a direction perpendicular to the optical axis.

これらにより，樹脂レンズ１１，１２は，鏡筒１４にはめ込まれることによって，鏡筒１４の鍔部１４ａと内側面とによって精密に位置決めされる。すなわち，鏡筒１４の鍔部１４ａと内側面とが，樹脂レンズ１１，１２の配置に関して基準面となっている。このように位置決めされた樹脂レンズ１１，１２は，そのコバ部１１ｂ，１２ｂがそれぞれ鍔部１４ａにレーザ溶着されることにより固定されている。   As a result, the resin lenses 11 and 12 are accurately positioned by the flange 14a and the inner side surface of the lens barrel 14 by being fitted into the lens barrel 14. That is, the flange portion 14 a and the inner side surface of the lens barrel 14 serve as a reference surface with respect to the arrangement of the resin lenses 11 and 12. The resin lenses 11 and 12 positioned in this way are fixed by laser welding the edge portions 11b and 12b to the flange portion 14a.

一方，樹脂レンズ１３は調芯レンズである。すなわち，樹脂レンズ１３は，鏡筒１４にはめ込まれた後もある程度移動させることができるようになっている。そのために，コバ部１３ｂの前面の一部は段差部１４ｂに当接されているが，樹脂レンズ１３の側面部は鏡筒１４には当接されていない。光学レンズ組１の製造時には，鏡筒１４に樹脂レンズ１１，１２，１３を組み込んだ後，その画像を確認しつつ樹脂レンズ１３の配置を調節することにより，光学レンズ組１の調芯を行う。そして，樹脂レンズ１３は，調芯終了後にそのコバ部１３ｂが段差部１４ｂにレーザ溶着されて固定されている。   On the other hand, the resin lens 13 is a centering lens. That is, the resin lens 13 can be moved to some extent even after being fitted into the lens barrel 14. Therefore, a part of the front surface of the edge portion 13 b is in contact with the stepped portion 14 b, but the side surface portion of the resin lens 13 is not in contact with the lens barrel 14. When the optical lens set 1 is manufactured, the resin lenses 11, 12, and 13 are assembled in the lens barrel 14, and then the alignment of the optical lens set 1 is performed by adjusting the arrangement of the resin lenses 13 while confirming the images. . The edge 13b of the resin lens 13 is fixed by laser welding to the step 14b after the alignment.

ここで，この光学レンズ組１では，図１に示すように，樹脂レンズ１１，１２のコバ部１１ｂ，１２ｂには，所定の数箇所に通気溝１５が設けられている。この通気溝１５によって，樹脂レンズ１１，１２，１３で囲まれた空間は外部と連通されている。従って，樹脂レンズ１１と樹脂レンズ１２との間，あるいは樹脂レンズ１２と樹脂レンズ１３との間の空気や組立時等に内部に発生したガスは，この通気溝１５を通って外部へ逃げることができる。   Here, in this optical lens set 1, as shown in FIG. 1, vent portions 15b and 12b of resin lenses 11 and 12 are provided with ventilation grooves 15 at predetermined locations. The space surrounded by the resin lenses 11, 12, and 13 is communicated with the outside by the ventilation groove 15. Therefore, the air generated between the resin lens 11 and the resin lens 12 or between the resin lens 12 and the resin lens 13 and the gas generated inside during assembly may escape to the outside through the ventilation groove 15. it can.

もしも，通気溝１５が形成されておらずこの空間が完全に閉鎖されていると，溶着時の加熱による空気の膨張やその後の冷却による収縮によって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１１，１２，１３の透明性が失われたり，また，完成後も環境要因や熱等により内部空気が膨張して樹脂レンズ１１，１２，１３が変形したりするおそれがある。この光学レンズ組１では通気溝１５が設けられているので，さらに光学レンズ組１内部の結露も防止できる。なお，この通気溝１５は樹脂レンズ１３や鏡筒１４に形成されていても良い。   If the ventilation groove 15 is not formed and this space is completely closed, assembly variation may occur due to expansion of air due to heating during welding or subsequent shrinkage due to cooling, or due to gas generated during welding. There is a possibility that the transparency of the resin lenses 11, 12, 13 is lost, or that the internal air expands due to environmental factors, heat, etc. even after completion, and the resin lenses 11, 12, 13 are deformed. Since the optical lens set 1 is provided with the ventilation groove 15, condensation inside the optical lens set 1 can be further prevented. The ventilation groove 15 may be formed in the resin lens 13 or the lens barrel 14.

次に，この光学レンズ組１を製造する方法を説明する。まず，各樹脂レンズ１１，１２，１３，鏡筒１４を，それぞれの材料の樹脂によって形成する。次に，鏡筒１４にその前方から樹脂レンズ１１を，後方から樹脂レンズ１２を組み込む。このとき，樹脂レンズ１１，１２のコバ部１１ｂ，１２ｂと鏡筒１４の鍔部１４ａとが，その全周で当接するまで確実に押し込む。これにより，樹脂レンズ１１，１２が，鏡筒１４の鍔部１４ａと内側面を基準として所定の配置に位置決めされる。   Next, a method for manufacturing the optical lens set 1 will be described. First, the resin lenses 11, 12, 13 and the lens barrel 14 are formed of resin of each material. Next, the resin lens 11 is assembled into the lens barrel 14 from the front, and the resin lens 12 is assembled from the rear. At this time, the edge portions 11b and 12b of the resin lenses 11 and 12 and the flange portion 14a of the lens barrel 14 are surely pushed in until they abut on the entire circumference. As a result, the resin lenses 11 and 12 are positioned in a predetermined arrangement with reference to the flange 14a and the inner surface of the lens barrel 14.

そして，鍔部１４ａの各レンズとの当接部に向かって，前後方両側からレーザ光を照射する。そのレーザ光はコバ部１１ｂ，１２ｂを透過し，鏡筒１４の鍔部１４ａに達するとそこで吸収される。従って，これらの当接部が加熱され，鍔部１４ａとコバ部１１ｂ，１２ｂとが溶け混じることにより接合される。これにより，樹脂レンズ１１，１２をそれぞれ鍔部１４ａに接合することができる。このとき，図１中の範囲Ｐの光軸方向に重なる位置に前後から同時に照射すれば，その部分の鍔部１４ａを効率よく加熱することができ，より確実に接合できる。   Then, the laser beam is irradiated from both the front and rear sides toward the abutting portion of the collar portion 14a with each lens. The laser light passes through the edge portions 11b and 12b and is absorbed when it reaches the collar portion 14a of the lens barrel 14. Therefore, these contact portions are heated, and the flange portion 14a and the edge portions 11b and 12b are melted and joined together. Thereby, the resin lenses 11 and 12 can each be joined to the collar part 14a. At this time, by simultaneously irradiating a position overlapping in the optical axis direction in the range P in FIG. 1 from the front and rear, the flange portion 14a of that portion can be efficiently heated and can be more reliably joined.

次に，樹脂レンズ１３を鏡筒１４に組み込み，その状態で光学レンズ組１に画像を入射して結像状態を確認しつつ調芯する。調芯が完了したら，光学レンズ組１をそのまま動かさないでレーザヘッドを近づけ，樹脂レンズ１３を段差部１４ｂに溶着する。このようにすれば，高精度の調芯状態を保持して固定することができる。あるいは，調芯完了した状態でレーザ光を短時間照射して仮固定を行い，調芯装置から取り外してから，さらなるレーザ溶着や接着剤等によってその位置を保った確実な固定をしても良い。   Next, the resin lens 13 is assembled in the lens barrel 14, and an image is incident on the optical lens set 1 in that state, and alignment is performed while confirming the image formation state. When alignment is completed, the laser lens is brought closer without moving the optical lens set 1 as it is, and the resin lens 13 is welded to the step portion 14b. In this way, a highly accurate alignment state can be maintained and fixed. Alternatively, after the alignment is completed, the laser beam is irradiated for a short time to temporarily fix it, and after removing it from the alignment device, the laser beam can be fixed securely with additional laser welding or adhesive. .

これらの樹脂レンズ１１，１２，１３の溶着時には，鏡筒１４との接合箇所は光軸中心の周囲に対称に配置された３箇所あるいは６箇所程度が好ましい。このようにすれば，その接合箇所では，樹脂レンズ１１，１２，１３や鏡筒１４の接合面が溶着時に多少変形したとしても，その他の大きな面部分で十分精密な位置決め精度が維持される。従って，鏡筒１４と樹脂レンズ１１，１２，１３との位置決めを高精度に保って，確実に接合できる。なお，これらの複数の接合箇所は，複数のレーザヘッドによって同時に接合しても良いし，少数のレーザヘッドで順に接合しても良い。   When these resin lenses 11, 12, and 13 are welded, it is preferable that the joint portion with the lens barrel 14 be three or six places symmetrically arranged around the center of the optical axis. In this way, even if the joint surfaces of the resin lenses 11, 12, 13 and the lens barrel 14 are slightly deformed at the time of welding, sufficiently precise positioning accuracy is maintained at the other large surface portions. Accordingly, the lens barrel 14 and the resin lenses 11, 12, and 13 can be reliably joined while maintaining high accuracy. It should be noted that the plurality of joining portions may be joined simultaneously by a plurality of laser heads, or may be joined in order by a small number of laser heads.

なお，この光学レンズ組１の製造方法に関しては，以下のように各種の工夫をすることができる。例えば，成形した樹脂レンズ１１，１２，１３をまず全て鏡筒１４に組み込むようにしてもよい。そうして，樹脂レンズ１３の調芯完了後，図２に示すように，全ての樹脂レンズ１１，１２，１３を鏡筒１４にレーザ溶着する。このようにすれば，例えば樹脂レンズ１２と鍔部１４ａとの接合部に向けられたレーザ光は，樹脂レンズ１３と樹脂レンズ１２とを透過して，鍔部１４ａに到達する。このとき，鍔部１４ａの両側から各レンズの接合部に同時にレーザ光を照射すれば，製造工程を短縮することができる。   In addition, regarding the manufacturing method of this optical lens group 1, various devices can be devised as follows. For example, all of the molded resin lenses 11, 12, and 13 may be first incorporated into the lens barrel 14. Then, after the alignment of the resin lens 13 is completed, all the resin lenses 11, 12, 13 are laser-welded to the lens barrel 14 as shown in FIG. In this way, for example, the laser light directed to the joint between the resin lens 12 and the flange 14a passes through the resin lens 13 and the resin lens 12 and reaches the flange 14a. At this time, if the laser beam is simultaneously irradiated from both sides of the flange portion 14a to the joint portion of each lens, the manufacturing process can be shortened.

あるいは，各樹脂レンズ１１，１２，１３を鏡筒１４に組み込んだ状態で，接合前に光学性能検査を行うようにしても良い。この検査を接合前に行えば，もしこの検査で不良が発見された場合にも，不良部材以外は再利用することができる。従来行われていたように，全レンズの組み付けと接合が終了してから検査を行うと，この検査でもし不良が発見された場合には光学レンズ組１の全体を処分する必要があった。この製造方法によれば，検査に合格したものはその配置を保って溶着することができるので，固定前に検査をしてもその位置決め精度は高精度に保たれる。   Alternatively, the optical performance inspection may be performed before bonding in a state where the resin lenses 11, 12, and 13 are incorporated in the lens barrel 14. If this inspection is performed before joining, even if a defect is found by this inspection, components other than the defective member can be reused. As in the prior art, when inspection is performed after assembly and bonding of all lenses is completed, if a defect is found in this inspection, the entire optical lens group 1 must be disposed of. According to this manufacturing method, those that pass the inspection can be welded while maintaining their arrangement, so that the positioning accuracy is kept high even if the inspection is performed before fixing.

またあるいは，図３に誇張して示すように，各樹脂レンズ１１，１２，１３と鏡筒１４との接合箇所に，僅かな窪み１４ｃを設けておくようにしてもよい。この窪み１４ｃは，位置決めのための当接部１４ｄとは区別して鏡筒１４に設けられ，その窪み１４ｃ部分にレーザ光を照射して溶着する。溶着時には樹脂は僅かに膨張し，また溶解によって多少の流動性を有するので，完全な密着状態でなくても溶着は可能である。この窪み１４ｃによる隙間は，２０〜１００μｍ程度が好ましい。このようにすれば，溶着時にも当接部１４ｄは密着した状態が保たれるので，各樹脂レンズ１１，１２，１３の位置決め精度をさらに向上させることができる。なお，この窪み１４ｃは樹脂レンズに設けられても良い。   Alternatively, as shown exaggeratedly in FIG. 3, a slight recess 14 c may be provided at a joint portion between each resin lens 11, 12, 13 and the lens barrel 14. The recess 14c is provided in the lens barrel 14 in distinction from the contact portion 14d for positioning, and the recess 14c is welded by irradiating a laser beam. At the time of welding, the resin expands slightly, and has some fluidity due to melting, so that welding is possible even if it is not completely adhered. The gap due to the recess 14c is preferably about 20 to 100 μm. In this way, the contact portion 14d is kept in a close contact state even during welding, so that the positioning accuracy of the resin lenses 11, 12, 13 can be further improved. In addition, this hollow 14c may be provided in the resin lens.

またあるいは，鏡筒１４のうち樹脂レンズ１１，１２，１３との接合面に当たる鍔部１４ａや段差部１４ｂの表面にシボ形状を形成しておいても良い。これにより，その部分のレーザ吸収がさらに良好になる。あるいは，各接合面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。   Alternatively, a textured shape may be formed on the surface of the flange portion 14a or the stepped portion 14b that contacts the joint surface of the lens barrel 14 with the resin lenses 11, 12, and 13. As a result, the laser absorption at that portion is further improved. Alternatively, both bonding surfaces may be formed as mirror surfaces 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.

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，鏡筒１４に鍔部１４ａと段差部１４ｂとが設けられ，これらに当接させることで，樹脂レンズ１１，１２，１３の位置決めができる。さらに，その位置決めされた状態を保って，その当接部分にレーザ光を照射すれば，鏡筒１４がレーザ光を吸収して加熱されることにより溶着できる。従って，組立作業が容易で，高精度に位置決めされたレンズ配置が得られる。   As described above in detail, according to the optical lens set 1 of the present embodiment, the lens barrel 14 is provided with the flange portion 14a and the step portion 14b, and is brought into contact with the lens portions 14a, 12b, and 13c. Can be positioned. Furthermore, if the laser beam is irradiated to the contact portion while maintaining the positioned state, the lens barrel 14 can be welded by absorbing and heating the laser beam. Therefore, an assembling operation is easy and a lens arrangement positioned with high accuracy can be obtained.

「第１の参考形態」
次に，本発明に関連する第１の参考形態について，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 Reference Form"
Next, a first reference embodiment related to 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.

第１の参考形態の光学レンズ組２は，図４に示すように，透明な樹脂レンズ２１，２２が鏡筒２３に組み込まれている。これらは，形状がやや異なるものの，第１の形態の樹脂レンズ１１，１２あるいは，鏡筒１４とほぼ同様の部材である。樹脂レンズ２１，２２には，光軸中心近傍の有効領域２１ａ，２２ａとその外周のコバ部２１ｂ，２２ｂとが設けられている。鏡筒２３の内周前方には，樹脂レンズ２１の前面位置の基準面となる段差面２３ａが設けられている。 In the optical lens set 2 of the first reference embodiment, transparent resin lenses 21 and 22 are incorporated in a lens barrel 23 as shown in FIG. These are substantially the same members as the resin lenses 11 and 12 or the lens barrel 14 of the first embodiment, although the shapes are slightly different. The resin lenses 21 and 22 are provided with effective areas 21a and 22a near the center of the optical axis and edge portions 21b and 22b on the outer periphery thereof. A step surface 23 a serving as a reference surface for the front surface position of the resin lens 21 is provided in front of the inner periphery of the lens barrel 23.

さらに，樹脂レンズ２１と樹脂レンズ２２との間には，ドーナツ板状の光路規制板２４が挟み込まれている。この光路規制板２４は，鏡筒２３と同様に有色の樹脂で形成されるか，あるいは透明部材に有色塗料を塗布して形成され，可視光を遮断し，レーザ光も吸収する。光路規制板２４の内周側端部は前方の樹脂レンズ２１のコバ部２１ｂの内周側とほぼ等しく配置され，有効領域外に入射した光がコバ部２１ｂを透過して撮像面へと達することを防止している。一方，光路規制板２４の外周側端部の径は樹脂レンズ２１，２２の外周よりも小さく形成されている。そして，光路規制板２４より外周側において，樹脂レンズ２１のコバ部２１ｂの後面と樹脂レンズ２２のコバ部２２ｂの前面とが直接当接されている。   Further, a donut plate-shaped optical path regulating plate 24 is sandwiched between the resin lens 21 and the resin lens 22. The optical path regulating plate 24 is formed of a colored resin as in the case of the lens barrel 23, or is formed by applying a colored paint to a transparent member, blocks visible light, and absorbs laser light. An end portion on the inner peripheral side of the optical path regulating plate 24 is disposed substantially equal to the inner peripheral side of the edge portion 21b of the front resin lens 21, and light incident outside the effective area passes through the edge portion 21b and reaches the imaging surface. To prevent that. On the other hand, the diameter of the outer peripheral side end of the optical path regulating plate 24 is smaller than the outer periphery of the resin lenses 21 and 22. The rear surface of the edge 21 b of the resin lens 21 and the front surface of the edge 22 b of the resin lens 22 are in direct contact with each other on the outer peripheral side of the optical path regulating plate 24.

また，このように配置するために，樹脂レンズ２１または樹脂レンズ２２のコバ部には段差が設けられている。図では，樹脂レンズ２２のコバ部２２ｂの前面に段差が形成されている。そして，樹脂レンズ２１と樹脂レンズ２２とは，コバ部２１ｂ，２２ｂが互いに当接されることにより，その光軸方向の間隔が精度良く位置決めされている。また，光路規制板２３は，樹脂レンズ２１，２２の有効領域２１ａ，２２ａより外周側を透過して，有効領域２１ａ，２２ａに光が入ることを防止する機能をも有している。   Further, in order to arrange in this way, a step is provided at the edge of the resin lens 21 or the resin lens 22. In the figure, a step is formed on the front surface of the edge 22 b of the resin lens 22. The resin lens 21 and the resin lens 22 are positioned with high accuracy in the optical axis direction by contacting the edge portions 21b and 22b with each other. The optical path regulating plate 23 also has a function of preventing light from entering the effective areas 21a and 22a through the outer peripheral side of the effective areas 21a and 22a of the resin lenses 21 and 22.

この光学レンズ組２を製造するときには，図５に斜線で示すように，光路規制板２４の外周にその約半分がかかるようにレーザ光Ｒを照射する。図５は，光路規制板２４を光軸方向に見た様子を示している。このようにすれば，レーザ光Ｒのうち光路規制板２４に当たっている部分は，光路規制板２４で吸収される。従って，その部分の光路規制板２４が加熱され，光路規制板２４の外周側端部に接している部分の樹脂レンズ２１，２２のコバ部２１ｂ，２２ｂが互いに溶着固定される。   When the optical lens set 2 is manufactured, the laser beam R is irradiated so that about half of the outer periphery of the optical path regulating plate 24 is applied as shown by the oblique lines in FIG. FIG. 5 shows a state in which the optical path regulating plate 24 is viewed in the optical axis direction. In this way, the portion of the laser light R that strikes the optical path regulating plate 24 is absorbed by the optical path regulating plate 24. Accordingly, the optical path regulating plate 24 in that portion is heated, and the edge portions 21 b and 22 b of the resin lenses 21 and 22 in the portion in contact with the outer peripheral side end portion of the optical path regulating plate 24 are welded and fixed to each other.

また，光路規制板２４より外側を通過した部分は，図４に示すように，さらに樹脂レンズ２１を透過して鏡筒２３の段差面２３ａに到達する。そして，段差面２３ａで吸収されて，鏡筒２３と樹脂レンズ２１とが溶着される。従って，１回のレーザ光Ｒの照射によって樹脂レンズ２１，２２間の溶着および，樹脂レンズ２１と鏡筒２３との溶着を同時に行うことができる。これにより，この形態の光学レンズ組２は，より少ない回数のレーザ光Ｒの照射によって製造することができる。   Further, as shown in FIG. 4, the portion that has passed outside the optical path regulating plate 24 further passes through the resin lens 21 and reaches the stepped surface 23 a of the lens barrel 23. And it absorbs with the level | step difference surface 23a, and the lens-barrel 23 and the resin lens 21 are welded. Therefore, the welding between the resin lenses 21 and 22 and the welding between the resin lens 21 and the lens barrel 23 can be performed simultaneously by one irradiation of the laser beam R. Thereby, the optical lens set 2 of this form can be manufactured by irradiation of the laser beam R a smaller number of times.

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，実施の形態の光学レンズ組１と同様に，組立作業が容易で，高精度に位置決めされたレンズ配置が得られる。 As described above in detail, according to the optical lens 2 of the present embodiment, similarly to the optical lens 1 of the embodiment is easy to assembly operations, the lens arrangement is obtained which is positioned with high accuracy.

「第２の参考形態」
次に，本発明に関連する第２の参考形態について，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。 " Second reference form"
Next, a second referential embodiment relating to 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.

第２の参考形態の光学レンズ組３は，図６に示すように，透明な樹脂レンズ３１，３２が鏡筒３３に組み込まれている。樹脂レンズ３１，３２には，光軸中心近傍の有効領域３１ａ，３２ａとその外周のコバ部３１ｂ，３２ｂとが設けられている。鏡筒３３には，樹脂レンズ３１の前面位置の基準面となる段差面３３ａが設けられている。すなわち，樹脂レンズ３１の前面は，鏡筒３３の段差面３３ａに当接されて位置決めされている。また，樹脂レンズ３１の後面と樹脂レンズ３２の前面とは互いに当接され，樹脂レンズ３１は樹脂レンズ３２と鏡筒３３とによって挟み込まれている。さらに，樹脂レンズ３１，３２の側面は，少なくともその一部分が鏡筒３３の内周面に当接され，鏡筒３３によって位置決めされている。 As shown in FIG. 6, the optical lens set 3 of the second reference embodiment has transparent resin lenses 31 and 32 incorporated in a lens barrel 33. The resin lenses 31 and 32 are provided with effective regions 31a and 32a in the vicinity of the center of the optical axis and edge portions 31b and 32b on the outer periphery thereof. The lens barrel 33 is provided with a step surface 33 a that serves as a reference surface for the front surface position of the resin lens 31. That is, the front surface of the resin lens 31 is positioned in contact with the step surface 33 a of the lens barrel 33. Further, the rear surface of the resin lens 31 and the front surface of the resin lens 32 are in contact with each other, and the resin lens 31 is sandwiched between the resin lens 32 and the lens barrel 33. Further, at least a part of the side surfaces of the resin lenses 31 and 32 is in contact with the inner peripheral surface of the lens barrel 33 and is positioned by the lens barrel 33.

この光学レンズ組３では，樹脂レンズ３２と鏡筒３３とは，例えばＰＣ（ポリカーボネート）等の同質の材料で形成されている。一方，樹脂レンズ３１は，例えばポリオレフィン系等の，樹脂レンズ３２や鏡筒３３とは異なる樹脂材料で形成されている。同質の樹脂材料同士であればその性状特性が一致しているため，容易に溶着できる。しかし，異種材料による部材の溶着は一般に，同種の場合よりもやや困難である。   In this optical lens set 3, the resin lens 32 and the lens barrel 33 are formed of the same material such as PC (polycarbonate). On the other hand, the resin lens 31 is formed of a resin material different from the resin lens 32 and the lens barrel 33, such as polyolefin. As long as the resin materials are of the same quality, their properties are the same, so they can be easily welded. However, welding of members from different materials is generally somewhat more difficult than the same type.

そこで，この光学レンズ組３では，図６に示すように，樹脂レンズ３１を樹脂レンズ３２と鏡筒３３とで挟み込むとともに，樹脂レンズ３２と鏡筒３３とを溶着している。例えば，鏡筒３３の内側面に当たるように，鏡筒３３と樹脂レンズ３２との当接部分にレーザ光を照射してこの部分を溶着する。樹脂レンズ３２と鏡筒３３とは同種の樹脂材料であるので，容易に溶着できるとともに強固な溶着状態を得ることができる。従って，この部分の溶着によって，樹脂レンズ３１を押さえ込んで固定することができる。これにより，この形態の光学レンズ組３によれば，少ない箇所の溶着で容易に製造される。なお，図６では，光軸に平行なレーザ光を照射しているが，光軸中心から鏡筒３３の内周面に向かって，やや斜めに照射しても良い。   Therefore, in this optical lens set 3, as shown in FIG. 6, the resin lens 31 is sandwiched between the resin lens 32 and the lens barrel 33, and the resin lens 32 and the lens barrel 33 are welded together. For example, the contact portion between the lens barrel 33 and the resin lens 32 is irradiated with laser light so as to hit the inner surface of the lens barrel 33, and this portion is welded. Since the resin lens 32 and the lens barrel 33 are the same type of resin material, they can be easily welded and a strong welded state can be obtained. Therefore, the resin lens 31 can be pressed and fixed by welding this portion. Thereby, according to the optical lens set 3 of this form, it is easily manufactured by welding with a few places. In FIG. 6, laser light parallel to the optical axis is irradiated, but irradiation may be performed slightly obliquely from the center of the optical axis toward the inner peripheral surface of the lens barrel 33.

また，この樹脂レンズ３２と鏡筒３３との溶着部分は，図７に示すようにすることもできる。これらの図は，撮像側（図６の右方）から光軸方向に見た図である。この方法では，あらかじめ鏡筒３３の内周面に，内周方向に向いた複数の凸部３３ｂを形成しておく。これらの凸部３３ｂは，その先端部を繋ぐ円が樹脂レンズ３２の外周よりやや小さく，互いに均等な配置で同じ大きさに形成されている。   Further, the welded portion between the resin lens 32 and the lens barrel 33 may be as shown in FIG. These figures are views seen in the optical axis direction from the imaging side (right side in FIG. 6). In this method, a plurality of convex portions 33 b oriented in the inner peripheral direction are formed in advance on the inner peripheral surface of the lens barrel 33. These convex portions 33b are formed in the same size with a uniform arrangement with respect to each other, with the circle connecting the tips thereof being slightly smaller than the outer periphery of the resin lens 32.

この光学レンズ組３の製造方法ではまず，鏡筒３３の後方から樹脂レンズ３１を挿入し，樹脂レンズ３１のコバ部３１ｂの前面を段差面３３ａに当接させる。次に，鏡筒３３の複数の凸部３３ｂの間に樹脂レンズ３２を圧入する。すると，図７（Ａ）に示すように，樹脂レンズ３２の外周がやや圧迫された状態となり，各凸部３３ｂによって樹脂レンズ３２の位置決めが精密に行われる。このとき，樹脂レンズ３２の前面が樹脂レンズ３１の後面に当接するまで押し込むことにより，樹脂レンズ３１，３２の光軸方向の位置決めも精密に行うことができる。   In the method of manufacturing the optical lens set 3, first, the resin lens 31 is inserted from the rear of the lens barrel 33, and the front surface of the edge portion 31b of the resin lens 31 is brought into contact with the step surface 33a. Next, the resin lens 32 is press-fitted between the plurality of convex portions 33 b of the lens barrel 33. Then, as shown in FIG. 7A, the outer periphery of the resin lens 32 is slightly pressed, and the positioning of the resin lens 32 is precisely performed by the convex portions 33b. At this time, the resin lens 32 is pushed in until the front surface of the resin lens 32 comes into contact with the rear surface of the resin lens 31, so that the resin lenses 31 and 32 can be accurately positioned in the optical axis direction.

次に，図７（Ｂ）に示すように，それらの凸部３３ｂにレーザ光を照射する。すると，凸部３３ｂがレーザ光を吸収するので，その部分で鏡筒３３と樹脂レンズ３２とが溶着される。その結果，図７（Ｃ）に示すように，凸部３３ｂの先端部が溶融して変形され，樹脂レンズ３２に対する応力が開放される。これによって，樹脂レンズ３２の歪みも発生せず，正確に位置決めした接合ができる。このとき，各凸部３３ｂへのレーザ光の照射を同時に行うようにすれば，さらに精密に位置決めが可能である。   Next, as shown in FIG. 7B, these convex portions 33b are irradiated with laser light. Then, since the convex portion 33b absorbs the laser beam, the lens barrel 33 and the resin lens 32 are welded at that portion. As a result, as shown in FIG. 7C, the tip of the convex portion 33b is melted and deformed, and the stress on the resin lens 32 is released. As a result, the resin lens 32 is not distorted and can be accurately positioned. At this time, if the projections 33b are irradiated with laser light at the same time, positioning can be performed more precisely.

以上詳細に説明したように，本形態の光学レンズ組３によれば，実施の形態の光学レンズ組１と同様に，組立作業が容易で，高精度に位置決めされたレンズ配置が得られる。 As described above in detail, according to the optical lens 3 of the present embodiment, as the optical lens 1 of the embodiment is easy to assembly operations, the lens arrangement is obtained which is positioned with high accuracy.

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，上記の各形態で，特に記載したもの以外はレーザ光の照射位置や照射箇所の個数も適宜変更可能である。
また，溶着に用いる光線はレーザ光でなくてもよく，鏡筒１４，２３，３３や光路規制板２４が吸収発熱できる光線であればどのようなものでもよい。 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.
In addition, for example, in the above-described embodiments, the irradiation position of the laser beam and the number of irradiation spots other than those specifically described can be appropriately changed.
The light beam used for welding may not be laser light, and any light beam that can be absorbed and generated by the lens barrels 14, 23, 33 and the optical path regulating plate 24 may be used.

実施の形態に係る光学レンズ組を示す概略断面図である。Is a schematic sectional view showing an optical lens according to the embodiment. 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１の参考の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 a 1st reference 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. 第２の参考の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 a 2nd reference 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.

符号の説明Explanation of symbols

１，２，３ 光学レンズ組（レンズユニット）
１１，１２，１３，２１，２２，３１，３２ 樹脂レンズ（透明樹脂レンズ）
１１ｂ，１２ｂ，１３ｂ，２１ｂ，２２ｂ コバ部（固定面）
１４，２３，３３ 鏡筒
１４ａ 鍔部（基準面）
１４ｂ 段差部（基準面）
２４ 光路規制板（光路規制部材）
３３ｂ 凸部（内筒面） 1,2,3 Optical lens set (lens unit)
11, 12, 13, 21, 22, 31, 32 Resin lens (transparent resin lens)
11b, 12b, 13b, 21b, 22b Edge (fixed surface)
14, 23, 33 lens barrel 14a collar (reference plane)
14b Stepped part (reference plane)
24 Optical path regulating plate (optical path regulating member)
33b Convex part (inner cylinder surface)

Claims (2)

第１および第２の透明樹脂レンズを鏡筒に組み付けてなるレンズユニットの製造方法において，
前記鏡筒として，
内側へ向けて突出する鍔部が形成されているとともに，
前記鍔部の表面（おもてめん）が，前記第１の透明樹脂レンズを軸方向に位置決めして固定する第１の基準面とされており，
前記鍔部の裏面が，前記第２の透明樹脂レンズを軸方向に位置決めして固定する第２の基準面とされているものを用い，
前記第１の透明樹脂レンズとして，前記第１の基準面と接する第１の固定面が形成されているものを用い，
前記第２の透明樹脂レンズとして，前記第２の基準面と接する第２の固定面が形成されているものを用い，
前記鏡筒と前記第１の透明樹脂レンズとの組み合わせとして，前記第１の基準面および前記第１の固定面の溶着箇所の一方に窪みが形成されているものを用い，
前記第１の固定面と前記第１の基準面との当接部のうち前記窪みの部分，および前記第２の固定面と前記第２の基準面との当接部にレーザ光を照射して溶着することを特徴とするレンズユニットの製造方法。 In a method of manufacturing a lens unit in which the first and second transparent resin lenses are assembled to a lens barrel,
As the lens barrel,
A collar that protrudes inward is formed,
The surface of the heel part (Otemen) is a first reference surface for positioning and fixing the first transparent resin lens in the axial direction,
Using the back surface of the collar portion as a second reference surface for positioning and fixing the second transparent resin lens in the axial direction,
As the first transparent resin lens, a lens having a first fixed surface in contact with the first reference surface is used.
As the second transparent resin lens, a lens having a second fixed surface in contact with the second reference surface is used.
As a combination of the lens barrel and the first transparent resin lens, one in which a depression is formed in one of the welding locations of the first reference surface and the first fixed surface,
Of the abutting portion between the first fixed surface and the first reference surface, a laser beam is applied to the recessed portion and the abutting portion between the second fixing surface and the second reference surface. And manufacturing the lens unit. 請求項１に記載するレンズユニットの製造方法において，
前記第１および第２の透明樹脂レンズとして，有効領域とその外部に設けられたコバ部とを有し，固定面が前記コバ部に形成されているものを用いることを特徴とするレンズユニットの製造方法。 In the manufacturing method of the lens unit of Claim 1 ,
As the first and second transparent resin lenses, a lens unit having an effective area and an edge portion provided outside the effective area and having a fixed surface formed on the edge portion is used. Production method.
JP2004191182A 2004-06-29 2004-06-29 Lens unit manufacturing method Expired - Fee Related JP4779315B2 (en)

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JP2006017818A (en) * 2004-06-30 2006-01-19 Konica Minolta Opto Inc Lens unit and manufacturing method thereof
JP5010105B2 (en) * 2005-02-23 2012-08-29 稲畑産業株式会社 Lens unit and manufacturing method thereof
WO2007099845A1 (en) * 2006-03-02 2007-09-07 Konica Minolta Opto, Inc. Imaging device
JP2007298873A (en) * 2006-05-02 2007-11-15 Pentax Corp Resin lens fixing method
JP5127171B2 (en) * 2006-07-10 2013-01-23 キヤノン株式会社 OPTICAL DEVICE AND OPTICAL DEVICE MANUFACTURING METHOD
JP5149496B2 (en) * 2006-08-25 2013-02-20 リコー光学株式会社 Lens welding method
JP2009080330A (en) * 2007-09-26 2009-04-16 Hitachi Maxell Ltd Lens unit, lens module, camera module and method for manufacturing lens unit
JP5377880B2 (en) * 2008-04-09 2013-12-25 日立マクセル株式会社 Lens unit, camera module, and lens unit manufacturing method
JP5087457B2 (en) * 2008-04-09 2012-12-05 リコー光学株式会社 Lens fixing method and lens unit
WO2009125640A1 (en) * 2008-04-09 2009-10-15 日立マクセル株式会社 Lens unit, camera module and lens unit manufacturing method
JP5295875B2 (en) 2008-11-06 2013-09-18 シャープ株式会社 Camera module, electronic device including the same, and lens positioning method for camera module
JP5818406B2 (en) * 2010-02-26 2015-11-18 大王製紙株式会社 Cleaning tool
US8917463B2 (en) 2010-07-07 2014-12-23 Panasonic Intellectual Property Corporation Of America Lens unit
JP5646028B2 (en) * 2013-10-07 2014-12-24 日立マクセル株式会社 Lens unit and camera module
JP7272755B2 (en) * 2017-06-02 2023-05-12 東京晨美光学電子株式会社 IMAGING LENS UNIT AND MANUFACTURING METHOD THEREOF
CN108983383A (en) * 2017-06-02 2018-12-11 康达智株式会社 Pick-up lens unit and its manufacturing method
CN209525519U (en) * 2019-01-08 2019-10-22 瑞声科技(新加坡)有限公司 Camera lens and electronic equipment with camera function
CN114174883A (en) * 2019-07-29 2022-03-11 京瓷株式会社 Imaging lens unit and method for manufacturing same
CN210270327U (en) * 2019-08-15 2020-04-07 瑞声通讯科技(常州)有限公司 Lens module
JP2022091342A (en) * 2020-12-09 2022-06-21 株式会社小糸製作所 Lens structure

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6169009A (en) * 1984-09-13 1986-04-09 Olympus Optical Co Ltd Lens assembly
JPS63141011A (en) * 1986-12-03 1988-06-13 Minolta Camera Co Ltd Holding device for lens
JP2000180688A (en) * 1998-12-21 2000-06-30 Sony Corp Optical element and optical pickup using it
JP2001051176A (en) * 1999-06-02 2001-02-23 Fuji Photo Film Co Ltd Lens holding method and lens holder
JP3739295B2 (en) * 2001-03-23 2006-01-25 カンタツ株式会社 Optical instrument with two or more lenses positioned and fixed in the lens barrel
JP2003066301A (en) * 2001-08-29 2003-03-05 Mitsumi Electric Co Ltd Joining structure and joining method for lens and lens holder
JP2004020867A (en) * 2002-06-14 2004-01-22 Fuji Photo Film Co Ltd Lens-fitted photographic film unit and its manufacturing method

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