JP2007041526A

JP2007041526A - Method for fixing optical element and method for manufacturing optical element fixing structure

Info

Publication number: JP2007041526A
Application number: JP2006115505A
Authority: JP
Inventors: Naoki Mitsuki; 直樹三ツ木; Hiroshi Miyakoshi; 博史宮越; Yoshiki Shibuya; 佳樹渋谷
Original assignee: Konica Minolta Inc
Current assignee: Konica Minolta Inc
Priority date: 2005-06-30
Filing date: 2006-04-19
Publication date: 2007-02-15

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for fixing an optical element and a method for manufacturing optical element fixing structure by which the thickness of a photosetting adhesive which has been photoset is made uniform with simple constitution, and adverse influence such as temperature rise in the optical element is restrained even when the optical element is irradiated with light such as ultraviolet rays so that it may be stuck and fixed with the photosetting adhesive. <P>SOLUTION: In the method for fixing the optical element, a photosetting adhesive is applied to at least either the sticking and fixing part of an optical element 10 or the sticking and fixing part of a fixed member 20 when the optical element 10 is stuck and fixed on the fixed member 20 with the photosetting adhesive, and then a light is made to pass through a load tool 31 constituted of a light transmissive material from a light source so as to irradiate the photosetting adhesive while applying load to the sticking and fixing part through the load tool 31. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、光学素子を固定部材に光硬化性接着剤で接着し固定する光学素子固定方法及び光学素子固定構造の製造方法に関する。 The present invention relates to an optical element fixing method in which an optical element is bonded and fixed to a fixing member with a photocurable adhesive, and a method for manufacturing an optical element fixing structure.

従来、ピックアップレンズや光通信モジュールに使われるマイクロレンズ等の光学素子を鏡筒等の固定部材に接着し固定する場合、紫外線硬化性接着剤を塗布してから紫外線光源から紫外線を紫外線硬化性接着剤に照射することで光学素子を固定部材に固定している。例えば、図１４のように、金属製のレンズ鏡筒２００内のカラー状の保持面２２０に紫外線硬化性接着剤を塗布し、レンズ１００をその取付面１５０が保持面２２０に対向するように配置した状態で、紫外線光源３０のノズル３０ａからレンズ１００に紫外線ａを照射することで接着剤層２９０を形成することで、レンズ１００をレンズ鏡筒２００に固定している。また、レンズ１００等の光学素子は、その軽量性やコスト面などの理由から樹脂材料から構成することが有利である。 Conventionally, when an optical element such as a microlens used in a pickup lens or an optical communication module is bonded and fixed to a fixing member such as a lens barrel, an ultraviolet curable adhesive is applied, and then an ultraviolet ray is applied from an ultraviolet light source. The optical element is fixed to the fixing member by irradiating the agent. For example, as shown in FIG. 14, an ultraviolet curable adhesive is applied to the collar-shaped holding surface 220 in the metal lens barrel 200, and the lens 100 is disposed so that the mounting surface 150 faces the holding surface 220. In this state, the lens 100 is fixed to the lens barrel 200 by forming the adhesive layer 290 by irradiating the lens 100 with ultraviolet rays a from the nozzle 30a of the ultraviolet light source 30. In addition, the optical element such as the lens 100 is advantageously made of a resin material because of its light weight and cost.

また、下記特許文献１は、紫外線硬化性接着剤を用いて光ディスク部材を接着する際に２９０ｎｍ以下の波長をカットするフィルタを通して紫外線を照射することで、紫外線により光ディスクの各部材を劣化させずに各部材の接着力の耐久性を向上させるようにした光ディスク部材の接着方法を開示する。特許文献１では、その第４図、第７図のように、接着剤を間に塗布したディスク状の基板上に２９０ｎｍ以下の波長をカットするガラス板を載せ、ガラス板の上にステンレス製の中空の円筒状重りを載せた状態で、複数の光ファイバを重りの外周や中心孔に配置して紫外線照射装置から各光ファイバを通してガラス板に紫外線を照射している。
特開平０３−１９８２３５号公報 In addition, Patent Document 1 below irradiates ultraviolet light through a filter that cuts a wavelength of 290 nm or less when an optical disk member is bonded using an ultraviolet curable adhesive, so that each member of the optical disk is not deteriorated by ultraviolet light. Disclosed is an optical disk member bonding method that improves the durability of the bonding strength of each member. In Patent Document 1, as shown in FIGS. 4 and 7, a glass plate that cuts a wavelength of 290 nm or less is placed on a disk-like substrate coated with an adhesive, and a stainless steel plate is placed on the glass plate. In a state where a hollow cylindrical weight is placed, a plurality of optical fibers are arranged on the outer periphery and the center hole of the weight, and ultraviolet rays are irradiated to the glass plate from the ultraviolet irradiation device through each optical fiber.
Japanese Patent Laid-Open No. 03-198235

レンズ等の光学素子が樹脂材料からなる場合、本発明者等の実験によれば、紫外線硬化性接着剤を硬化させるためにはある程度の時間で紫外線を照射する必要がある一方、紫外線を１０秒以上、光学素子に照射すると、光学素子の温度がかなり上昇し、光学素子のレンズ面等が変形してしまう等の悪影響が生じることが判明した。また、紫外線硬化性接着剤を適用した接着面に圧力を加えながら紫外線を照射して接着剤を硬化させることで、接着剤の厚さが均一になることが判明した。 When an optical element such as a lens is made of a resin material, according to experiments by the present inventors, it is necessary to irradiate ultraviolet rays for a certain period of time in order to cure the ultraviolet curable adhesive. As described above, it has been found that when the optical element is irradiated, the temperature of the optical element rises considerably and adverse effects such as deformation of the lens surface of the optical element occur. Further, it has been found that the thickness of the adhesive becomes uniform by irradiating ultraviolet rays while applying pressure to the adhesive surface to which the ultraviolet curable adhesive is applied to cure the adhesive.

しかし、図１４のようなレンズ鏡筒に外径４〜５ｍｍ程度のマイクロレンズを接着剤により取り付けて固定する場合、レンズ鏡筒が金属製であり非透光性のためレンズを通してしか接着剤に紫外線を照射できず、特許文献１の第４図や第７図のように重しをレンズ鏡筒内に配置し、重しの中心孔や外周に光ファイバを配置して紫外線を照射することはかなり困難であり、また、重しと光ファイバを配置する構成は複雑であり、接着剤硬化のための工程に手間がかかって生産性が低下してしまう。 However, when a microlens having an outer diameter of about 4 to 5 mm is attached and fixed to a lens barrel as shown in FIG. 14 with an adhesive, the lens barrel is made of metal and is not translucent so that it can only be attached through the lens. UV light cannot be irradiated, and a weight is placed in the lens barrel as shown in FIGS. 4 and 7 of Patent Document 1, and an optical fiber is placed in the center hole and outer periphery of the weight to irradiate the UV light. Is difficult, and the arrangement of the weight and the optical fiber is complicated, and the process for curing the adhesive takes time and productivity is lowered.

本発明は、上述のような従来技術の問題に鑑み、簡単な構成で硬化後の光硬化性接着剤の厚さを均一にでき、また、光硬化性接着剤による接着固定のために光学素子に紫外線等の光を照射しても光学素子における温度上昇等の悪影響を抑えることができる光学素子固定方法及び光学素子固定構造の製造方法を提供することを目的とする。 In view of the above-described problems of the prior art, the present invention can make the thickness of the photocurable adhesive after curing uniform with a simple configuration, and can be used to fix the optical element with the photocurable adhesive. An object of the present invention is to provide an optical element fixing method and a manufacturing method of an optical element fixing structure that can suppress adverse effects such as temperature rise in the optical element even when irradiated with light such as ultraviolet rays.

上記目的を達成するために、本発明による光学素子固定方法は、光学素子を固定部材に光硬化性接着剤で接着し固定する光学素子固定方法であって、前記光学素子の接着固定部及び前記固定部材の接着固定部の少なくとも一方に前記光硬化性接着剤を適用してから、透光性材料から構成した荷重冶具を介して前記接着固定部に荷重を加えながら、光源から前記荷重冶具を通して前記光硬化性接着剤に光照射を行うことを特徴とする。 In order to achieve the above object, an optical element fixing method according to the present invention is an optical element fixing method in which an optical element is bonded and fixed to a fixing member with a photocurable adhesive, the adhesive fixing portion of the optical element and the optical element fixing method. The light-curing adhesive is applied to at least one of the adhesive fixing portions of the fixing member, and then a load is applied to the adhesive fixing portion via a load jig made of a light-transmitting material, while passing through the load jig from a light source. The photocurable adhesive is irradiated with light.

この光学素子固定方法によれば、接着固定部に適用された光硬化性接着剤に対し接着剤硬化のために光源から光を照射するとき、ガラス等の透光性材料から構成した荷重冶具を通して光照射を行いながら荷重冶具を介して接着固定部に荷重を加えるので、硬化後の接着剤の厚さを均一にできる。また、荷重冶具を通して光照射を行うことができるので、光源からの光照射の際に特別な光ファイバ等を配置する必要がなく、簡単な構成で光硬化性接着剤の厚さを均一にできる。 According to this optical element fixing method, when light is irradiated from a light source for curing the adhesive to the photocurable adhesive applied to the adhesive fixing portion, the load is made of a light transmissive material such as glass. Since a load is applied to the adhesive fixing portion via the load jig while performing light irradiation, the thickness of the cured adhesive can be made uniform. Moreover, since light irradiation can be performed through a load jig, it is not necessary to arrange a special optical fiber or the like at the time of light irradiation from the light source, and the thickness of the photocurable adhesive can be made uniform with a simple configuration. .

この場合、前記透光性材料は前記光硬化性接着剤の硬化に関与しない領域の波長の光を吸収する特性を有することで、荷重冶具を通して光照射を行う際に光硬化性接着剤の硬化に関与しない領域の波長の光を吸収するので、光学素子における温度上昇等の悪影響を効果的に抑えることができる。 In this case, the translucent material has a property of absorbing light having a wavelength in a region not involved in the curing of the photocurable adhesive, so that when the light irradiation is performed through the load jig, the photocurable adhesive is cured. Since the light of the wavelength of the area | region which is not concerned with is absorbed, bad influences, such as a temperature rise in an optical element, can be suppressed effectively.

また、前記透光性材料は、前記光硬化性接着剤の硬化に関与する領域の波長の光を透過する特性を有することで、接着剤の硬化効率が向上し、光照射時間を短縮できる。即ち、荷重冶具を光硬化性接着剤硬化に必要な光（例えば、波長３００〜４５０ｎｍ）を通すフィルタ機能をもつ材料で作成する。また、例えば、もともとの光源が波長４５０ｎｍ以上をカットしていれば、フィルタ機能としては３００〜４５０ｎｍだけを通すものではなく、３００ｎｍ以上の波長を通すものでよい。 Moreover, the said translucent material has the characteristic which permeate | transmits the light of the wavelength of the area | region which is concerned with hardening of the said photocurable adhesive agent, The hardening efficiency of an adhesive agent improves and it can shorten light irradiation time. That is, the load jig is made of a material having a filter function that transmits light (for example, a wavelength of 300 to 450 nm) necessary for curing the photocurable adhesive. Further, for example, if the original light source cuts a wavelength of 450 nm or more, the filter function does not pass only 300 to 450 nm, but may pass a wavelength of 300 nm or more.

具体的には、光硬化性接着剤が紫外線硬化性である場合、前記透光性材料は、波長３００ｎｍ以下の光を吸収するとともに、波長３００〜４５０ｎｍの範囲内の光を透過する特性を有することが好ましい。波長３００ｎｍ以下の光を吸収することで温度上昇等の悪影響を効果的に抑えることができるとともに、波長３００〜４５０ｎｍの範囲内の光を透過させて接着剤を硬化させるとき、光学素子に悪影響を及ぼす温度以下では、荷重冶具を通さない照射の場合に比べて短時間で接着剤の硬化が可能である。 Specifically, when the photocurable adhesive is ultraviolet curable, the translucent material absorbs light having a wavelength of 300 nm or less and transmits light within a wavelength range of 300 to 450 nm. It is preferable. Absorption of light with a wavelength of 300 nm or less can effectively suppress adverse effects such as temperature rise, and when the adhesive is cured by transmitting light within a wavelength range of 300 to 450 nm, the optical element is adversely affected. Below the applied temperature, the adhesive can be cured in a shorter time than in the case of irradiation without passing through a load jig.

また、前記荷重冶具は、前記光照射の際に前記光学素子の光学機能部に光が照射されないように光を制限する光制限部を有することで、レンズ機能等の光学機能部の光照射による劣化を防止できる。 In addition, the load jig has a light limiting unit that limits light so that the optical function unit of the optical element is not irradiated with light during the light irradiation. Deterioration can be prevented.

また、前記荷重冶具は、前記光照射の際に前記接着固定部に光を導くような光導波部を有することで、効率的な光照射を行うことができ、接着剤硬化を促進できる。 Moreover, the said load jig can perform efficient light irradiation by having an optical waveguide part which guides light to the said adhesive fixing | fixed part in the case of the said light irradiation, and can accelerate | stimulate adhesive hardening.

また、前記固定部材と前記光学素子と前記荷重冶具と前記光源とを位置決め部材で位置決めてから前記光照射を行うことで、光源の位置が安定し、再現性のよい光照射を実現できるので、光学素子と固定部材とを一定の高品質で接着固定することができる。 In addition, by performing the light irradiation after positioning the fixing member, the optical element, the load jig, and the light source with a positioning member, the position of the light source is stabilized, and light irradiation with good reproducibility can be realized. The optical element and the fixing member can be bonded and fixed with a certain high quality.

なお、光学素子の接着固定部及び固定部材の接着固定部の少なくとも一方の面をブラスト処理、切削、レーザ光照射、プラズマ加工または化学処理などの表面粗さ処理方法により粗くすることで、接着剤を均一に塗布でき、接着剤の厚さを均一にできるとともに、接着せん断強度を大きくできる。 In addition, the adhesive agent is obtained by roughening at least one surface of the adhesive fixing portion of the optical element and the adhesive fixing portion of the fixing member by a surface roughness processing method such as blasting, cutting, laser light irradiation, plasma processing, or chemical processing. Can be applied uniformly, the thickness of the adhesive can be made uniform, and the adhesive shear strength can be increased.

また、荷重冶具による接着固定部への圧力は０．５〜２ｋｇｆ／ｃｍ²の範囲内が好ましく、圧力が０．５ｋｇｆ／ｃｍ²以上であれば、接着剤の厚さを実用上充分に均一にでき、２ｋｇｆ／ｃｍ²以下であれば、接着剤の厚さが薄くなりすぎなく、また光学素子の変形やひずみが生じない。荷重冶具による圧力が自重による場合は、荷重冶具の大きさ（寸法）を調整することで、適当な圧力を得ることができる。 Moreover, pressure is preferably in the range of 0.5~2kgf / cm ² to bond the fixed portion by the load jig, if the pressure 0.5 kgf / cm ² or more, practically sufficiently uniform thickness of the adhesive If it is ² kgf / cm ² or less, the thickness of the adhesive does not become too thin, and the optical element is not deformed or distorted. When the pressure due to the load jig is due to its own weight, an appropriate pressure can be obtained by adjusting the size (dimension) of the load jig.

本発明による光学素子固定構造の製造方法は、光学素子が接着固定部で固定部材の接着固定部に接着されて固定される光学素子固定構造を、上述の光学素子固定方法により、前記光学素子を前記固定部材に固定することで製造することを特徴とする。 An optical element fixing structure manufacturing method according to the present invention includes an optical element fixing structure in which an optical element is bonded and fixed to an adhesive fixing portion of a fixing member by an adhesive fixing portion. It manufactures by fixing to the said fixing member.

この光学素子固定構造の製造方法によれば、透光性材料から構成された荷重冶具を通して光照射を行うとともに荷重冶具により接着固定部へ荷重を加えるので、簡単な構成で接着剤の厚さを均一にできるとともに、透光性材料が光硬化性接着剤の硬化に関与しない所定領域の波長の光を吸収することで、光学素子における温度上昇等の悪影響を抑えることができる。このため、光学素子を固定部材に安定かつ確実に接着し固定できるとともに品質のよい光学素子固定構造を得ることができる。 According to this method for manufacturing an optical element fixing structure, light irradiation is performed through a load jig made of a translucent material, and a load is applied to the adhesive fixing portion by the load jig. Therefore, the thickness of the adhesive can be reduced with a simple configuration. In addition to being uniform, the light-transmitting material absorbs light having a wavelength in a predetermined region that is not involved in the curing of the photocurable adhesive, thereby suppressing adverse effects such as a temperature rise in the optical element. For this reason, it is possible to stably and surely adhere and fix the optical element to the fixing member, and to obtain a high-quality optical element fixing structure.

上記光学素子固定構造の製造方法は、前記光学素子固定構造が前記接着固定部に対し前記光学素子を通して前記光照射を行う構造である場合に適用して好ましい。例えば、光透過性ではない鏡筒等の固定部材の内部に光学素子が固定され、接着固定部に光学素子を通してしか光照射を行うことができないような光学素子固定構造の場合に適用して好ましい。 The manufacturing method of the optical element fixing structure is preferably applied when the optical element fixing structure is a structure for performing the light irradiation through the optical element with respect to the adhesive fixing portion. For example, the present invention is preferably applied to an optical element fixing structure in which an optical element is fixed inside a fixing member such as a lens barrel that is not light transmissive, and light can be irradiated only through the optical element to the adhesive fixing portion. .

本発明の光学素子固定方法及び光学素子固定構造の製造方法によれば、簡単な構成で硬化後の光硬化性接着剤の厚さを均一にでき、接着強度・接着特性が安定する。また、光硬化性接着剤による接着固定のために光学素子に紫外線等の光を照射しても光学素子における温度上昇等の悪影響を抑えることができる。 According to the optical element fixing method and the optical element fixing structure manufacturing method of the present invention, the thickness of the photo-curing adhesive after curing can be made uniform with a simple configuration, and the adhesive strength and adhesive characteristics are stabilized. In addition, adverse effects such as a temperature rise in the optical element can be suppressed even if the optical element is irradiated with light such as ultraviolet rays for adhesion and fixing with a photocurable adhesive.

以下、本発明を実施するための最良の形態について図面を用いて説明する。 The best mode for carrying out the present invention will be described below with reference to the drawings.

〈第１の実施の形態〉 <First Embodiment>

図１は第１の実施の形態による光学素子固定方法を説明するためのレンズ固定構造及び紫外線（ＵＶ）光源・荷重冶具を示す要部縦断面図である。 FIG. 1 is a longitudinal sectional view of an essential part showing a lens fixing structure, an ultraviolet (UV) light source and a load jig for explaining an optical element fixing method according to a first embodiment.

図１に示すレンズ固定構造は、円筒状のレンズ鏡筒２０の内面２０ａにレンズ１０を接着剤で接着し固定するものである。 The lens fixing structure shown in FIG. 1 is one in which the lens 10 is bonded and fixed to the inner surface 20a of the cylindrical lens barrel 20 with an adhesive.

レンズ１０は、レンズ機能を有するレンズ部１１と、レンズ部１１の外周側に位置しレンズ１０の最外周１４まで延びる外周部１３と、外周部１３から光軸ｐと略平行な方向に突き出た取付部１２と、を有し、光学素子用の樹脂から構成されたプラスチックレンズである。レンズ部１１は光軸ｐを中心とする凸部１１ａを有し、凸部１１ａの反対側の平坦面１１ｂはレンズ部１１から外周部１３の一部まで延びている。外周部１３と取付部１２から応力緩和部を構成できる。 The lens 10 has a lens portion 11 having a lens function, an outer peripheral portion 13 that is located on the outer peripheral side of the lens portion 11 and extends to the outermost outer periphery 14 of the lens 10, and protrudes from the outer peripheral portion 13 in a direction substantially parallel to the optical axis p. And a mounting lens 12, and a plastic lens made of a resin for optical elements. The lens part 11 has a convex part 11 a centered on the optical axis p, and a flat surface 11 b on the opposite side of the convex part 11 a extends from the lens part 11 to a part of the outer peripheral part 13. A stress relaxation part can be comprised from the outer peripheral part 13 and the attaching part 12. FIG.

取付部１２は、外周部１３から凸部１１ａの反対側に略短筒状に脚部を構成するように延びており、レンズ鏡筒２０の内面２０ａに対向する外周がレンズ１０の最外周１４を構成する。取付部１２の先端部が光軸ｐに対し直交する方向に取付面１５に形成されている。また、最外周１４の図の上部は隅部が面取りされて面取部１６が形成されている。 The mounting portion 12 extends from the outer peripheral portion 13 to the opposite side of the convex portion 11 a so as to form a leg portion in a substantially short cylindrical shape, and the outer periphery facing the inner surface 20 a of the lens barrel 20 is the outermost outer periphery 14 of the lens 10. Configure. The tip of the mounting portion 12 is formed on the mounting surface 15 in a direction orthogonal to the optical axis p. In addition, a chamfered portion 16 is formed by chamfering a corner portion at the upper portion of the outermost outer periphery 14 in the figure.

レンズ鏡筒２０は、その内面２０ａから光軸ｐに対し直交する方向（レンズ鏡筒２０の半径方向内側）にカラー状に突き出て形成された保持部２１を有し、保持部２１のカラー状の保持面２２にレンズ１０の取付部１２の取付面１５が対向するようになっている。 The lens barrel 20 has a holding portion 21 that protrudes in a collar shape in a direction orthogonal to the optical axis p from the inner surface 20a thereof (inward in the radial direction of the lens barrel 20). The mounting surface 15 of the mounting portion 12 of the lens 10 faces the holding surface 22 of the lens 10.

レンズ鏡筒２０は鉄・ニッケル・コバルト系の合金（例えば、商品名「コバール」）からなり、ＮｉまたはＣｒのめっき処理が施されている。レンズ鏡筒２０は鉄鋼・ステンレス鋼・アルミニウム・アルミニウム合金等の他の金属材料から構成されてもよい。図１のレンズ鏡筒２０の保持部２１のめっき処理されたカラー状の保持面２２の全面がサンドブラスト処理により粗くされている。 The lens barrel 20 is made of an iron / nickel / cobalt alloy (for example, trade name “KOVAL”) and is plated with Ni or Cr. The lens barrel 20 may be made of other metal materials such as steel, stainless steel, aluminum, and aluminum alloy. The entire surface of the colored holding surface 22 plated in the holding portion 21 of the lens barrel 20 of FIG. 1 is roughened by sandblasting.

上述のレンズ１０をレンズ鏡筒２０に接着固定する工程を説明する。まず、液状の紫外線硬化性接着剤をレンズ鏡筒２０の保持面２２に塗布する。この紫外線硬化性接着剤としてはエポキシ系またはアクリル系のものが好ましい。 A process of bonding and fixing the lens 10 to the lens barrel 20 will be described. First, a liquid ultraviolet curable adhesive is applied to the holding surface 22 of the lens barrel 20. The ultraviolet curable adhesive is preferably an epoxy or acrylic one.

次に、図１の上方からレンズ１０を取付部１２を下側にしてレンズ鏡筒２０内に挿入し、保持面２２に載せる。これにより、取付面１５と保持面２２との間に接着剤層２９が形成される。なお、レンズ１０の取付部１２にも液状の接着剤を予め塗布しておいてもよい。 Next, the lens 10 is inserted into the lens barrel 20 from above in FIG. 1 with the mounting portion 12 facing down, and placed on the holding surface 22. Thereby, an adhesive layer 29 is formed between the mounting surface 15 and the holding surface 22. Note that a liquid adhesive may be applied in advance to the attachment portion 12 of the lens 10.

次に、図１のように、レンズ鏡筒２０の端部から内面２０ａに透光性材料からなる円柱状の荷重冶具３１をレンズ１０の上方に向けて差し込み、荷重冶具３１の先端面３１ａをレンズ１０の外周部１３に当てることで、荷重冶具３１の自重により接着剤層２９に荷重を加えながら、紫外線（ＵＶ）光源３０のノズル３０ａから荷重冶具３１を通してレンズ１０に紫外線ａを照射する。なお、荷重冶具３１の先端面３１ａ側には、レンズ１０の凸部１１ａに対応して凹部３１ｂが形成されている。 Next, as shown in FIG. 1, a cylindrical load jig 31 made of a translucent material is inserted from the end of the lens barrel 20 into the inner surface 20 a toward the upper side of the lens 10, and the tip end surface 31 a of the load jig 31 is inserted. The lens 10 is irradiated with ultraviolet rays a from the nozzle 30 a of the ultraviolet (UV) light source 30 through the load jig 31 while applying a load to the adhesive layer 29 by the weight of the load jig 31 by being applied to the outer peripheral portion 13 of the lens 10. A concave portion 31 b is formed on the tip surface 31 a side of the load jig 31 corresponding to the convex portion 11 a of the lens 10.

上述の荷重冶具３１はガラス材（ＢＫ７）からなり、例えば厚さ（高さ）を２．６ｍｍとすることで、ＵＶ光源３０から紫外線ａを荷重冶具３１を通して照射したとき、接着剤層２９の紫外線硬化に不要な波長（２５０ｎｍ付近）の光を吸収し９８％以上カットすることができるとともに、接着剤層２９の紫外線硬化に必要な３５０〜４５０ｎｍの波長の光を７０〜８０％透過させることができる。 The load jig 31 is made of a glass material (BK7). For example, when the thickness (height) is 2.6 mm, when the ultraviolet light a is irradiated from the UV light source 30 through the load jig 31, the adhesive layer 29 Absorbs light with a wavelength unnecessary for UV curing (around 250 nm) and cuts 98% or more, and transmits light with a wavelength of 350 to 450 nm necessary for UV curing of the adhesive layer 29 by 70 to 80%. Can do.

また、荷重冶具３１の自重によるレンズ１０の取付面１５に対する圧力が０．５〜２ｋｇｆ／ｃｍ²の範囲内となるように、荷重冶具３１の大きさ（特に高さ寸法）を調整することが好ましい。 In addition, the size (particularly the height dimension) of the load jig 31 may be adjusted so that the pressure on the mounting surface 15 of the lens 10 due to the weight of the load jig 31 falls within the range of 0.5 to ² kgf / cm ^2. preferable.

上述のレンズ１０への紫外線ａの照射により、紫外線ａが荷重冶具３１及びレンズ１０の主に外周部１３及び取付部１２を通して取付面１５と保持面２２との間の接着剤層２９に照射されることで、接着剤層２９が硬化する。なお、硬化後の接着剤層２９の厚さは５〜１０μｍ程度が好ましい。 By irradiating the lens 10 with the ultraviolet ray a, the ultraviolet ray a is irradiated to the adhesive layer 29 between the mounting surface 15 and the holding surface 22 through the load jig 31 and the lens 10 mainly through the outer peripheral portion 13 and the mounting portion 12. As a result, the adhesive layer 29 is cured. In addition, as for the thickness of the adhesive bond layer 29 after hardening, about 5-10 micrometers is preferable.

以上のようにして、レンズ１０をレンズ鏡筒２０に接着固定することができるが、ＵＶ光源３０から紫外線を照射する際に、上述のようなガラス材からなる荷重冶具３１が被照射体であるレンズ１０に前置されているので、接着剤層２９の紫外線硬化に不要な波長の光を９８％以上カットすることができ、レンズ１０における紫外線照射による温度上昇を抑えることができるとともに、接着剤層２９の紫外線硬化に必要な３５０〜４５０ｎｍの波長の光を７０〜８０％透過させることができ、レンズ１０に悪影響を及ぼす温度以下（例えば、７０度）では、荷重冶具３１なしの場合に比べて短時間で接着剤を硬化できる。 As described above, the lens 10 can be bonded and fixed to the lens barrel 20, but when irradiating ultraviolet rays from the UV light source 30, the load jig 31 made of the glass material as described above is an object to be irradiated. Since it is placed in front of the lens 10, 98% or more of light having a wavelength unnecessary for UV curing of the adhesive layer 29 can be cut off, and the temperature rise due to UV irradiation in the lens 10 can be suppressed, and the adhesive can be used. Light having a wavelength of 350 to 450 nm necessary for ultraviolet curing of the layer 29 can be transmitted by 70 to 80%, and at a temperature lower than the temperature that adversely affects the lens 10 (for example, 70 degrees), compared to the case without the load jig 31. The adhesive can be cured in a short time.

また、図１に示すレンズ固定構造は、固定部材であるレンズ鏡筒２０が金属材料製であり光透過性でなく、レンズ鏡筒２０の内面にレンズ１０が固定され、レンズ１０の最外周１４の側面側やレンズ鏡筒２０の保持部２１側から紫外線を照射できずに、接着固定部である取付面１５と保持面２２にレンズ１０を通してしか紫外線照射を行うことができない構造であるが、本実施の形態による光学素子固定方法は、かかるレンズ固定構造の場合に適用して好ましい。 Further, in the lens fixing structure shown in FIG. 1, the lens barrel 20 as a fixing member is made of a metal material and is not light-transmitting, and the lens 10 is fixed to the inner surface of the lens barrel 20, and the outermost periphery 14 of the lens 10 is fixed. In this structure, ultraviolet rays cannot be irradiated from the side surface side or the holding portion 21 side of the lens barrel 20 and ultraviolet rays can be irradiated only through the lens 10 to the mounting surface 15 and the holding surface 22 that are adhesive fixing portions. The optical element fixing method according to the present embodiment is preferably applied to such a lens fixing structure.

以上のように、本実施の形態の光学素子固定方法によれば、光源からの光照射の際に特別な光ファイバ等を配置する必要がなく、簡単な構成で硬化後の接着剤層２９の厚さを均一にでき、接着強度や接着特性が安定するとともに、レンズ１０に紫外線を照射しても温度上昇等の悪影響を抑えることができ、光学素子用樹脂から構成されるレンズ１０が熱により変形してしまうことはない。 As described above, according to the optical element fixing method of the present embodiment, it is not necessary to arrange a special optical fiber or the like when irradiating light from a light source, and the adhesive layer 29 after curing can be formed with a simple configuration. The thickness can be made uniform, the adhesive strength and adhesive properties can be stabilized, and adverse effects such as temperature rise can be suppressed even when the lens 10 is irradiated with ultraviolet rays. There is no deformation.

また、上述の紫外線照射の際に、図１の破線で示すようにレンズ１０のレンズ部１１の凸部１１ａを覆うようにシート状の遮光部材３２を配置することで、取付面１５以外の部分、特にレンズ部１１における光照射による劣化等の悪影響を防止できる。 Further, when the above-described ultraviolet irradiation is performed, the sheet-shaped light shielding member 32 is disposed so as to cover the convex portion 11a of the lens portion 11 of the lens 10 as shown by a broken line in FIG. In particular, adverse effects such as deterioration due to light irradiation in the lens unit 11 can be prevented.

なお、上述のように、接着剤をレンズ鏡筒２０の保持面２２に塗布するとき、接着面である保持面２２が粗くされているので、接着剤の広がりが粗くする前のめっき表面よりもよくなり、接着剤層２９の厚さを均等に制御し易くなる。また、レンズ１０に対し接着剤の厚さ方向に荷重を加えながら紫外線を照射することが好ましく、これにより、接着剤層２９の厚さを一定にでき、また、接着強度や接着特性も安定する。 As described above, when the adhesive is applied to the holding surface 22 of the lens barrel 20, the holding surface 22 that is the bonding surface is roughened, so that the adhesive spreads more than the plating surface before the spread of the adhesive is roughened. As a result, the thickness of the adhesive layer 29 can be controlled uniformly. Further, it is preferable to irradiate the lens 10 with ultraviolet rays while applying a load in the thickness direction of the adhesive, whereby the thickness of the adhesive layer 29 can be made constant, and the adhesive strength and adhesive characteristics are also stabilized. .

〈第２の実施の形態〉 <Second Embodiment>

図２乃至図５は、第２の実施の形態による各光学素子固定方法を説明するためのレンズ固定構造及び荷重冶具を概略的に示す要部縦断面図である。 FIG. 2 to FIG. 5 are main part longitudinal sectional views schematically showing a lens fixing structure and a load jig for explaining each optical element fixing method according to the second embodiment.

第２の実施の形態による光学素子固定方法は、荷重冶具を透光性材料から構成し、荷重冶具でレンズを介して接着剤の厚さ方向に荷重を加えながら紫外線を照射するようにしたものである。なお、図２乃至図４における接着固定対象のレンズは、図１のレンズ１０とほぼ同一であるので、同一部分には同じ符号を付けてその説明は省略する。 In the optical element fixing method according to the second embodiment, the load jig is made of a translucent material, and the load jig irradiates ultraviolet rays while applying a load in the thickness direction of the adhesive through the lens. It is. 2 to 4 are substantially the same as the lens 10 shown in FIG. 1, and therefore, the same portions are denoted by the same reference numerals and description thereof is omitted.

図２に示す例は、円筒状のレンズ鏡筒４０が下部に光軸ｐに対し直交する方向にカラー状に突き出て形成された保持部４１を有し、この保持部４１のカラー状の保持面４２にレンズ１０の取付部１２の取付面１５が対向して接着固定されるレンズ固定構造である。なお、レンズ鏡筒４０は図１のレンズ鏡筒２０と同じ金属材料から構成される。 In the example shown in FIG. 2, a cylindrical lens barrel 40 has a holding portion 41 formed at the lower portion so as to protrude in a color shape in a direction perpendicular to the optical axis p. This is a lens fixing structure in which the mounting surface 15 of the mounting portion 12 of the lens 10 is oppositely bonded and fixed to the surface 42. The lens barrel 40 is made of the same metal material as the lens barrel 20 of FIG.

図２では、レンズ１０の取付面１５とレンズ鏡筒４０の保持面４２との間の接着剤層４９の厚さ方向に荷重冶具４５を介して荷重を加えるようにしている。荷重冶具４５は、図１の荷重冶具と同様にガラス材（ＢＫ７）から円柱状に構成され、レンズ１０の外周部１３上に載置されて上面４５ａ側から荷重が加えられるようになっている。荷重冶具４５は、下面４５ｂ側にレンズ１０の凸部１１ａに対応して凹部４６が形成されており、下面４５ｂがレンズ１０の外周部１３に密着することができる。 In FIG. 2, a load is applied via a load jig 45 in the thickness direction of the adhesive layer 49 between the mounting surface 15 of the lens 10 and the holding surface 42 of the lens barrel 40. The load jig 45 is formed of a glass material (BK7) in a columnar shape like the load jig of FIG. 1 and is placed on the outer peripheral portion 13 of the lens 10 so that a load is applied from the upper surface 45a side. . The load jig 45 has a concave portion 46 formed on the lower surface 45 b side corresponding to the convex portion 11 a of the lens 10, and the lower surface 45 b can be in close contact with the outer peripheral portion 13 of the lens 10.

上述の荷重冶具４５を用いてレンズ１０をレンズ鏡筒４０に接着固定する工程を説明する。まず、液状のエポキシ系またはアクリル系の紫外線硬化性接着剤をレンズ鏡筒４０の保持面４２に塗布する。 A process of bonding and fixing the lens 10 to the lens barrel 40 using the load jig 45 will be described. First, a liquid epoxy or acrylic ultraviolet curable adhesive is applied to the holding surface 42 of the lens barrel 40.

次に、図２の上方からレンズ１０を取付部１２を下側にしてレンズ鏡筒４０内に挿入し、保持面４２に載せる。これにより、取付面１５と保持面４２との間に接着剤層４９が形成される。なお、レンズ１０の取付部１２にも液状の接着剤を予め塗布しておいてもよい。 Next, the lens 10 is inserted into the lens barrel 40 from the upper side of FIG. Thereby, an adhesive layer 49 is formed between the mounting surface 15 and the holding surface 42. Note that a liquid adhesive may be applied in advance to the attachment portion 12 of the lens 10.

次に、図２のように、荷重冶具４５をレンズ１０の上面の外周部１３上に載せ、紫外線（ＵＶ）光源（図示省略）から紫外線を紫外線照射方向ｂに照射し、荷重冶具４５の上面４５ａから紫外線を入射させるとともに、荷重冶具４５に荷重を加えてレンズ１０をレンズ鏡筒４０の保持面４２に押し付けることで、接着剤層４９の厚さ方向に荷重を加える。なお、荷重冶具４５の自重のみでレンズ１０の取付面１５に対する必要な圧力（０．５〜２ｋｇｆ／ｃｍ²）を得ることができる場合には、外力を加える必要はない。 Next, as shown in FIG. 2, the load jig 45 is placed on the outer peripheral portion 13 of the upper surface of the lens 10, and ultraviolet rays are irradiated from an ultraviolet (UV) light source (not shown) in the ultraviolet irradiation direction b. While making ultraviolet rays enter from 45 a and applying a load to the load jig 45 and pressing the lens 10 against the holding surface 42 of the lens barrel 40, a load is applied in the thickness direction of the adhesive layer 49. In addition, when the required pressure (0.5-2 kgf / cm < ² >) with respect to the attachment surface 15 of the lens 10 can be obtained only with the own weight of the load jig 45, it is not necessary to apply external force.

上述のガラス材からなる荷重冶具４５は、例えば厚さを２．６ｍｍとすることで、ＵＶ光源から紫外線を荷重冶具４５を通して照射したとき、接着剤層４９の紫外線硬化に不要な波長（２５０ｎｍ付近）の光を９８％以上カットすることができるとともに、接着剤層４９の紫外線硬化に必要な３５０〜４５０ｎｍの波長の光を７０〜８０％透過させることができる。 The load jig 45 made of the above-described glass material has a thickness of 2.6 mm, for example, so that when the ultraviolet ray is irradiated from the UV light source through the load jig 45, a wavelength unnecessary for ultraviolet curing of the adhesive layer 49 (around 250 nm) ) Can be cut by 98% or more, and light having a wavelength of 350 to 450 nm necessary for ultraviolet curing of the adhesive layer 49 can be transmitted by 70 to 80%.

上述の荷重冶具４５への紫外線照射により、荷重冶具４５の上面４５ａから入射した紫外線が下面４５ｂからレンズ１０の外周部１３及び取付部１２を通して取付面１５と保持面４２との間の接着剤層４９に照射されることで、接着剤層４９が硬化する。 The ultraviolet light incident from the upper surface 45a of the load jig 45 by the ultraviolet irradiation to the load jig 45 described above passes through the outer peripheral portion 13 and the attachment portion 12 of the lens 10 from the lower surface 45b, and the adhesive layer between the attachment surface 15 and the holding surface 42. By irradiating 49, the adhesive layer 49 is cured.

以上のようにして、ＵＶ光源から紫外線を荷重冶具４５を通して接着剤層４９に照射することでレンズ１０をレンズ鏡筒４０に接着固定することができるが、このとき、荷重冶具４５において、接着剤層４９の紫外線硬化に不要な波長の光を９８％以上カットすることで、レンズ１０における紫外線照射による温度上昇を抑えることができるとともに、接着剤層４９の紫外線硬化に必要な３５０〜４５０ｎｍの波長の光を７０〜８０％透過させることで、レンズ１０に悪影響を及ぼす温度以下（例えば、７０度）では、荷重冶具４５を通さない照射の場合に比べて短時間で硬化できる。 As described above, the lens 10 can be bonded and fixed to the lens barrel 40 by irradiating the adhesive layer 49 with ultraviolet rays from the UV light source through the load jig 45. By cutting 98% or more of light having a wavelength unnecessary for ultraviolet curing of the layer 49, it is possible to suppress a temperature rise due to ultraviolet irradiation in the lens 10 and a wavelength of 350 to 450 nm necessary for ultraviolet curing of the adhesive layer 49. By transmitting 70 to 80% of the light, it can be cured in a shorter time than the temperature that adversely affects the lens 10 (for example, 70 degrees) as compared with the case of irradiation without passing through the load jig 45.

また、上記紫外線照射の際に荷重冶具４５及びレンズ１０を介して接着剤層４９の厚さ方向に荷重を加えることで、接着剤層４９の厚さを均一にでき、また、接着強度や接着特性も安定する。 Further, by applying a load in the thickness direction of the adhesive layer 49 through the load jig 45 and the lens 10 during the ultraviolet irradiation, the thickness of the adhesive layer 49 can be made uniform, and the adhesive strength and adhesion can be increased. The characteristics are also stable.

また、図２に示すレンズ固定構造は、固定部材であるレンズ鏡筒４０が金属材料製であり光透過性でなく、レンズ鏡筒４０の内面にレンズ１０が固定され、レンズ１０の最外周１４の側面側やレンズ鏡筒２０の保持部４１側から紫外線を照射できずに、接着固定部である取付面１５と保持面４２にレンズ１０を通してしか紫外線照射を行うことができない構造であるが、本実施の形態による光学素子固定方法は、かかるレンズ固定構造の場合に適用して好ましく、接着剤層４９の厚さを一定にできるとともに、レンズ１０に紫外線を照射しても温度上昇等の悪影響を抑えることができる。 In the lens fixing structure shown in FIG. 2, the lens barrel 40 as a fixing member is made of a metal material and is not light transmissive. The lens 10 is fixed to the inner surface of the lens barrel 40, and the outermost periphery 14 of the lens 10. In this structure, ultraviolet rays cannot be irradiated from the side surface side or the holding portion 41 side of the lens barrel 20, and the ultraviolet rays can be irradiated only through the lens 10 to the attachment surface 15 and the holding surface 42 which are adhesive fixing portions. The optical element fixing method according to the present embodiment is preferably applied in the case of such a lens fixing structure. The thickness of the adhesive layer 49 can be made constant, and even if the lens 10 is irradiated with ultraviolet rays, an adverse effect such as an increase in temperature. Can be suppressed.

なお、図１と同様に、レンズ鏡筒４０の保持面４２を粗くすることが好ましく、接着剤を保持面４２に塗布するとき、接着剤の広がりがよくなり、接着剤層２９の厚さを均等に制御し易くなる。 As in FIG. 1, it is preferable to roughen the holding surface 42 of the lens barrel 40. When the adhesive is applied to the holding surface 42, the spread of the adhesive is improved and the thickness of the adhesive layer 29 is increased. It becomes easy to control equally.

次に、図３の例を説明する。図３は、図２の荷重冶具４５の凹部４６の凹面に反射面４６ａを形成している点が図２と異なり、それ以外は、図２と同様である。反射面４６ａは、例えば、ニッケルやアルミニウムやクロム等の金属材料から蒸着等で形成することができる。 Next, the example of FIG. 3 will be described. FIG. 3 is the same as FIG. 2 except that the reflecting surface 46a is formed on the concave surface of the concave portion 46 of the load jig 45 of FIG. The reflective surface 46a can be formed by vapor deposition or the like from a metal material such as nickel, aluminum, or chromium.

図２と同様に、ＵＶ光源から紫外線を紫外線照射方向ｂに荷重冶具４５を通して接着剤層４９に照射するとき、荷重冶具４５内に入射した紫外線が凹部４６の反射面４６ａで反射するので、紫外線は凹部４６からレンズ１０のレンズ部１１に向かうことが制限され、図３の矢印方向ｃに下面４５ｂに向かい、レンズ１０に入射する。このため、レンズ部１１に紫外線が照射されないので、レンズ部１１の劣化を防止できるとともに、紫外線は反射面４６ａで反射する分だけより多くなり、接着剤層４９に効率よく照射されるので、接着剤硬化を促進でき、光照射時間を短縮できる。 As in FIG. 2, when ultraviolet light is irradiated from the UV light source to the adhesive layer 49 through the load jig 45 in the ultraviolet irradiation direction b, the ultraviolet light that has entered the load jig 45 is reflected by the reflecting surface 46 a of the recess 46. Is limited from the concave portion 46 toward the lens portion 11 of the lens 10, and enters the lower surface 45 b in the arrow direction c of FIG. 3 and enters the lens 10. For this reason, since the lens unit 11 is not irradiated with ultraviolet rays, the lens unit 11 can be prevented from being deteriorated, and the ultraviolet rays are increased by the amount reflected by the reflecting surface 46a, and the adhesive layer 49 is efficiently irradiated. The curing of the agent can be promoted, and the light irradiation time can be shortened.

次に、図４の例を説明する。図４は、図３の荷重冶具４５の反射面４６ａに加えて荷重冶具４５の外周面にも反射面４７を形成している点が図３と異なり、それ以外は、図３と同様である。反射面４７は、例えば、ニッケルやアルミニウムやクロム等の金属材料から蒸着等で形成することができる。 Next, the example of FIG. 4 will be described. 4 is different from FIG. 3 in that a reflection surface 47 is formed on the outer peripheral surface of the load jig 45 in addition to the reflection surface 46a of the load jig 45 of FIG. . The reflecting surface 47 can be formed by vapor deposition or the like from a metal material such as nickel, aluminum, or chromium.

図２と同様に、ＵＶ光源から紫外線を紫外線照射方向ｂに荷重冶具４５を通して接着剤層４９に照射するとき、荷重冶具４５内に入射した紫外線が凹部４６の反射面４６ａで反射するとともに、外周面の反射面４７で反射することで、紫外線は図の矢印方向ｄに下面４５ｂへと導かれ、レンズ１０に入射する。このため、レンズ部１１に紫外線が照射されないので、レンズ部１１の劣化を防止できるとともに、紫外線は反射面４６ａ及び反射面４７で反射し下面４５ｂへと導かれる分だけより多くなり、接着剤層４９に効率よく照射されるので、接着剤硬化を促進でき、光照射時間を短縮できる。 Similarly to FIG. 2, when the adhesive layer 49 is irradiated with ultraviolet rays from the UV light source in the ultraviolet irradiation direction b through the load jig 45, the ultraviolet light incident on the load jig 45 is reflected by the reflecting surface 46a of the recess 46 and the outer periphery. By being reflected by the reflecting surface 47 of the surface, the ultraviolet light is guided to the lower surface 45 b in the arrow direction d in the figure and enters the lens 10. For this reason, since the lens portion 11 is not irradiated with ultraviolet rays, the lens portion 11 can be prevented from being deteriorated, and the ultraviolet rays are increased by the amount reflected by the reflecting surface 46a and the reflecting surface 47 and guided to the lower surface 45b. 49 is efficiently irradiated, so that the curing of the adhesive can be promoted and the light irradiation time can be shortened.

次に、図５の例を説明する。図５は、接着固定対象のレンズ５０が、上述のレンズ１０のように取付部１２が脚状に延びるようになっておらず、一般的な略円柱状の形状を有する点が図３と異なり、それ以外は、図３と同様である。レンズ５０は、平坦な上面５２から突き出た凸部５１でレンズ部を構成し、平坦な下面５３の外周面側がレンズ鏡筒４０の保持面４２と対向しており、保持面４２と下面５３の外周面との間に接着剤層５９が形成される。 Next, the example of FIG. 5 will be described. FIG. 5 is different from FIG. 3 in that the lens 50 to be bonded and fixed does not have the attachment portion 12 extending in a leg shape like the lens 10 described above and has a general substantially cylindrical shape. Other than that, it is the same as FIG. The lens 50 includes a convex portion 51 protruding from the flat upper surface 52, and the outer peripheral surface side of the flat lower surface 53 faces the holding surface 42 of the lens barrel 40. An adhesive layer 59 is formed between the outer peripheral surface.

図５の荷重冶具４５は、図３と同様に構成され、ＵＶ光源から紫外線を紫外線照射方向ｂに荷重冶具４５を通して接着剤層５９に照射するとき、荷重冶具４５内に入射した紫外線が凹部４６の反射面４６ａで反射するので、紫外線は凹部４６からレンズ５０の凸部５１に向かうことが制限され、図５の矢印方向ｃに下面４５ｂに向かい、レンズ５０に入射する。このため、凸部５１に紫外線が照射されないので、凸部５１の劣化を防止できるとともに、紫外線は反射面４６ａで反射する分だけより多くなり、接着剤層５９に効率よく照射されるので、接着剤硬化を促進でき、光照射時間を短縮できる。 The load jig 45 in FIG. 5 is configured in the same manner as in FIG. 3, and when the UV light source irradiates the adhesive layer 59 through the load jig 45 in the ultraviolet irradiation direction b, the ultraviolet light incident into the load jig 45 is recessed 46. Therefore, the ultraviolet ray is restricted from traveling from the concave portion 46 to the convex portion 51 of the lens 50, and enters the lens 50 toward the lower surface 45 b in the arrow direction c of FIG. 5. For this reason, since the convex portion 51 is not irradiated with ultraviolet rays, the convex portion 51 can be prevented from being deteriorated, and the ultraviolet rays are increased by the amount reflected by the reflecting surface 46a, and the adhesive layer 59 is efficiently irradiated. The curing of the agent can be promoted, and the light irradiation time can be shortened.

上述のように、略円柱状のレンズ５０をレンズ鏡筒４０の保持面４２に接着剤層５９で接着固定できるが、図５の場合も、接着固定部である下面５３と保持面４２にレンズ５０を通してしか紫外線照射を行うことができない構造であるが、図５の光学素子固定方法は、かかるレンズ固定構造の場合に適用して好ましく、レンズ５０に紫外線を照射しても温度上昇等の悪影響を抑えることができる。 As described above, the substantially cylindrical lens 50 can be bonded and fixed to the holding surface 42 of the lens barrel 40 with the adhesive layer 59, but in the case of FIG. 5 as well, the lens is attached to the lower surface 53 and the holding surface 42 which are adhesive fixing portions. The optical element fixing method in FIG. 5 is preferably applied to such a lens fixing structure, and adverse effects such as a temperature rise even if the lens 50 is irradiated with ultraviolet rays. Can be suppressed.

〈第３の実施の形態〉 <Third Embodiment>

図６は第３の実施の形態による光学素子固定方法を説明するためのレンズ固定構造及び荷重冶具・ＵＶ光源のノズル・位置決め部材を概略的に示す要部縦断面図である。 FIG. 6 is a longitudinal sectional view of an essential part schematically showing a lens fixing structure, a load jig, a nozzle of a UV light source, and a positioning member for explaining an optical element fixing method according to a third embodiment.

図６の例は、図３のレンズ固定構造を図３の荷重冶具で得る際に、ＵＶ光源の先端ノズル６１を固定し、レンズ鏡筒４０とレンズ１０と荷重冶具４５に対し位置決めるようにしたものである。 In the example of FIG. 6, when the lens fixing structure of FIG. 3 is obtained with the load jig of FIG. 3, the tip nozzle 61 of the UV light source is fixed and positioned with respect to the lens barrel 40, the lens 10, and the load jig 45. It is what.

図６のように、位置決め部材６２は円筒状に構成されるとともに底部でカラー状に突き出た載置部６２ａを有し、また、ＵＶ光源は内孔６１ａのあるノズル６１を有し、内孔６１ａを通して図６の紫外線照射方向ｂに紫外線を照射し、ノズル６１の先端が図の上方から位置決め部材６２の内周面６２ｂに差し込まれるようになっている。 As shown in FIG. 6, the positioning member 62 is configured in a cylindrical shape and has a mounting portion 62a protruding in a collar shape at the bottom, and the UV light source has a nozzle 61 having an inner hole 61a. Ultraviolet light is irradiated in the ultraviolet irradiation direction b of FIG. 6 through 61a, and the tip of the nozzle 61 is inserted into the inner peripheral surface 62b of the positioning member 62 from above in the figure.

図６のように、位置決め部材６２が載置部６２ａで作業台６５の上に安定して載置された状態で、内周面６２ｂにレンズ鏡筒４０が配置され、レンズ鏡筒４０の保持面４２上に液状の接着剤が塗布されてから、レンズ１０が載せられ、レンズ１０の上に荷重冶具４５が配置される。そして、内周面６２ｂ内で荷重冶具４５の周りに円筒補助部材６３が配置されてから、ＵＶ光源のノズル６１が位置決め部材６２の内周面６２ｂに差し込まれる。これにより、ＵＶ光源のノズル６１が円筒補助部材６３とレンズ鏡筒４０に対し位置決められる結果、荷重冶具４５とレンズ１０に対し位置決められる。 As shown in FIG. 6, the lens barrel 40 is disposed on the inner peripheral surface 62b in a state where the positioning member 62 is stably placed on the work table 65 by the placement portion 62a, and the lens barrel 40 is held. After the liquid adhesive is applied on the surface 42, the lens 10 is placed, and the load jig 45 is disposed on the lens 10. Then, after the cylindrical auxiliary member 63 is arranged around the load jig 45 in the inner peripheral surface 62 b, the nozzle 61 of the UV light source is inserted into the inner peripheral surface 62 b of the positioning member 62. As a result, the nozzle 61 of the UV light source is positioned relative to the cylindrical auxiliary member 63 and the lens barrel 40, and as a result, is positioned relative to the load jig 45 and the lens 10.

図６のような配置でＵＶ光源からノズル６１の内孔６１ａを通して紫外線が紫外線照射方向ｂに照射されることにより、図３と同様に荷重冶具４５及びレンズ１０を通して接着剤層２９に照射されて接着剤層２９が硬化する。 In the arrangement as shown in FIG. 6, ultraviolet rays are irradiated from the UV light source through the inner hole 61 a of the nozzle 61 in the ultraviolet irradiation direction b, so that the adhesive layer 29 is irradiated through the load jig 45 and the lens 10 as in FIG. 3. The adhesive layer 29 is cured.

図６のような位置決め部材６２を用いた光学素子固定方法によれば、位置決め部材６２により、ＵＶ光源のノズル６１を位置決めて固定するとともに、レンズ鏡筒４０とレンズ１０と荷重冶具４５とをノズル６１に対し位置決めて一体に固定するので、ＵＶ光源の位置が安定し、再現性のよい紫外線照射を実現でき、レンズ１０をレンズ鏡筒４０に接着剤層４９で一定の高品質で接着固定することができる。 According to the optical element fixing method using the positioning member 62 as shown in FIG. 6, the positioning member 62 positions and fixes the nozzle 61 of the UV light source, and the lens barrel 40, the lens 10 and the load jig 45 are connected to the nozzle. Positioning with respect to 61 and fixing integrally, the position of the UV light source is stable, and reproducible ultraviolet irradiation can be realized, and the lens 10 is bonded and fixed to the lens barrel 40 with an adhesive layer 49 with a certain high quality. be able to.

上記第１乃至第３の実施の形態においてレンズ１０，５０は各種の樹脂材料からなるプラスチックレンズであってよいが、図７に３種類の樹脂材料（ＰＣ、ＡＰＬ、ＰＭＭＡ）の光透過特性を示すように、各樹脂材料は、波長３００ｎｍ以下で光透過率がかなり低下し、特に、ＰＣ、ＡＰＬでは殆ど零になることが分かる。光透過率が殆ど零であるということは、その波長の光は殆ど吸収されることを意味し、樹脂材料はその吸収された光のエネルギーにより発熱してしまう。一方、紫外線硬化性接着剤は、３００〜４５０ｎｍの範囲内の波長の光で硬化する。以上のことから、第１乃至第３の実施の形態において、紫外線照射の際に、荷重冶具３１，４５でレンズ照射前の段階で波長３００ｎｍ以下の光を吸収することでレンズ１０，５０の発熱を効果的に抑えることができるとともに、波長３００〜４５０ｎｍ範囲内の光を透過させることで接着剤層２９，４９，５９を効率的に硬化させることができる。 In the first to third embodiments, the lenses 10 and 50 may be plastic lenses made of various resin materials. FIG. 7 shows the light transmission characteristics of three types of resin materials (PC, APL, and PMMA). As shown, the light transmittance of each resin material is considerably reduced at a wavelength of 300 nm or less, and in particular, it is found that it becomes almost zero in PC and APL. The fact that the light transmittance is almost zero means that light of that wavelength is almost absorbed, and the resin material generates heat due to the energy of the absorbed light. On the other hand, the ultraviolet curable adhesive is cured with light having a wavelength in the range of 300 to 450 nm. From the above, in the first to third embodiments, when the ultraviolet rays are irradiated, the load jigs 31 and 45 absorb light having a wavelength of 300 nm or less before the lens irradiation to generate heat of the lenses 10 and 50. Can be effectively suppressed, and the adhesive layers 29, 49, and 59 can be efficiently cured by transmitting light in the wavelength range of 300 to 450 nm.

次に、本発明を実施例により更に具体的に説明する。 Next, the present invention will be described more specifically with reference to examples.

〈予備実験例１〉 <Preliminary Experiment Example 1>

予備実験例１として、ガラス板（ＢＫ７）を通して紫外線（ＵＶ）を照射したときの表面温度を測定した。また、比較実験例１として、ガラス板（ＢＫ７）を用いずに、紫外線（ＵＶ）を直接照射したときの表面温度を測定した。 As preliminary experimental example 1, the surface temperature when ultraviolet rays (UV) were irradiated through a glass plate (BK7) was measured. Further, as Comparative Experimental Example 1, the surface temperature when directly irradiating ultraviolet rays (UV) was measured without using a glass plate (BK7).

予備実験例１、比較実験例１では、紫外線照射装置（ＵＶ光源）として、NAiS（松下電工）Aicure SPOT TYPE ANUP5204を使用し、光が照射されるノズル先端から距離２．５ｃｍの位置で熱電対により表面温度を測定した。予備実験例１では表面から距離１０ｍｍの位置に厚さ２．６ｍｍのガラス板を配置した。その測定結果を図８に示す。 In Preliminary Experimental Example 1 and Comparative Experimental Example 1, NAiS (Matsushita Electric Works) Aicure SPOT TYPE ANUP5204 is used as the ultraviolet irradiation device (UV light source), and the thermocouple is located at a distance of 2.5 cm from the tip of the nozzle irradiated with light. Was used to measure the surface temperature. In Preliminary Experimental Example 1, a glass plate having a thickness of 2.6 mm was arranged at a distance of 10 mm from the surface. The measurement results are shown in FIG.

図８から分かるように、ガラス板（ＢＫ７）を用いずに紫外線を直接照射した比較実験例１では、照射時間の経過とともにかなり温度が上昇し、標準的な最高照射時間３０秒で１３０度を超えてしまうのに対し、ガラス板（ＢＫ７）を配置して紫外線を照射した予備実験例１では、照射時間３０秒で６０度を超えず、温度上昇による変形等の悪影響が発生し易い７０度ライン以下であった。 As can be seen from FIG. 8, in Comparative Experimental Example 1 in which ultraviolet rays were directly irradiated without using a glass plate (BK7), the temperature rose considerably with the lapse of irradiation time, and 130 degrees was reached with a standard maximum irradiation time of 30 seconds. On the other hand, in Preliminary Experimental Example 1 in which the glass plate (BK7) is placed and irradiated with ultraviolet rays, the temperature does not exceed 60 degrees in an irradiation time of 30 seconds, and adverse effects such as deformation due to temperature rise are likely to occur. It was below the line.

〈予備実験例２〉 <Preliminary Experiment Example 2>

予備実験例２として、予備実験例１と同様にしてガラス板（ＢＫ７）を通して紫外線（ＵＶ）を照射したときの表面の光強度を測定した。また、比較実験例２として、ガラス板（ＢＫ７）を用いずに、紫外線（ＵＶ）を直接照射したときの表面の光強度を測定した。予備実験例２，比較実験例２では、予備実験例１と同じＵＶ光源のノズル先端から光強度を測定するセンサ表面までの距離を１．５〜５ｃｍの範囲で変えて光強度を測定した。その測定結果を図９（波長が３５０ｎｍのとき）、図１０（波長が２５０ｎｍのとき）、図１１（波長が４２０ｎｍのとき）、及び図１２（全波長範囲）に示す。なお、光強度センサとして、オーク製作所のもの（ORGUV-M10）を使用した。 As preliminary experiment example 2, the light intensity of the surface when ultraviolet rays (UV) were irradiated through a glass plate (BK7) in the same manner as preliminary experiment example 1 was measured. Further, as Comparative Experimental Example 2, the light intensity of the surface when directly irradiated with ultraviolet rays (UV) was measured without using a glass plate (BK7). In Preliminary Experimental Example 2 and Comparative Experimental Example 2, the light intensity was measured by changing the distance from the nozzle tip of the same UV light source as in Preliminary Experimental Example 1 to the sensor surface for measuring the light intensity in the range of 1.5 to 5 cm. The measurement results are shown in FIG. 9 (when the wavelength is 350 nm), FIG. 10 (when the wavelength is 250 nm), FIG. 11 (when the wavelength is 420 nm), and FIG. 12 (full wavelength range). As the light intensity sensor, an Oak Seisakusho (ORGUV-M10) was used.

図９，図１１，図１２から波長３５０ｎｍ、４２０ｎｍ及び全波長範囲のときに、予備実験例２では、比較実験例２と比べて、光強度が１０〜３０％程度低下するのに対し、図１０から波長２５０ｎｍのときには９８〜９９％程度低下することが分かる。予備実験例２で配置したガラス板により、波長が３００ｎｍ以下の光を殆どカットできることが分かる。 9, 11, and 12, when the wavelength is 350 nm, 420 nm, and the entire wavelength range, in the preliminary experimental example 2, the light intensity is reduced by about 10 to 30% as compared with the comparative experimental example 2, whereas FIG. It can be seen that when the wavelength is 10 to 250 nm, it decreases by about 98 to 99%. It can be seen that the glass plate arranged in Preliminary Experimental Example 2 can almost cut light with a wavelength of 300 nm or less.

〈実施例〉 <Example>

次に、実施例として、図１と類似の図１３（ａ）のようなレンズ固定構造を有するレンズ鏡筒を次のようにして組み立てた。即ち、金属製の鏡筒内の保持面に接着剤を塗布してから保持面にレンズの取付面を当てて上記予備実験例１，２と同様のガラス材（ＢＫ７）から作製した円柱状の荷重冶具（４５ｇ）をレンズの上面に載せた状態で、予備実験例１，２と同じＵＶ光源から紫外線を上方からガラス製の荷重冶具を通して鏡筒の保持面上の接着剤に照射した。このとき、鏡筒の保持面上の接着剤には荷重冶具の自重（４５ｇ）により１ｋｇｆ／ｃｍ²程度の圧力が加わった。レンズは、環状オレフィン系の樹脂材料からなる外径４ｍｍのプラスチックレンズであり、接着剤は紫外線硬化性エポキシ系接着剤（商品名：エレクトロライト社製2500Clear）を用いた。接着剤の粘度は、５００ｃＰ（＝０．５Ｐａ・ｓ）である。 Next, as an example, a lens barrel having a lens fixing structure as shown in FIG. 13A similar to FIG. 1 was assembled as follows. That is, a cylindrical shape made of the same glass material (BK7) as in the preliminary experimental examples 1 and 2 by applying an adhesive to the holding surface in the metal lens barrel and then applying the lens mounting surface to the holding surface. With the load jig (45 g) placed on the upper surface of the lens, the adhesive on the holding surface of the lens barrel was irradiated from above with UV light from the same UV light source as in Preliminary Experimental Examples 1 and 2, through a glass load jig. At this time, a pressure of about 1 kgf / cm ² was applied to the adhesive on the holding surface of the lens barrel by its own weight (45 g). The lens was a plastic lens having an outer diameter of 4 mm made of a cyclic olefin resin material, and an ultraviolet curable epoxy adhesive (trade name: 2500 Clear manufactured by Electrolite) was used as the adhesive. The viscosity of the adhesive is 500 cP (= 0.5 Pa · s).

また、比較例として、上記実施例と同様の工程で同様のレンズ鏡筒を組み立てたが、実施例の荷重冶具を用いずレンズに荷重を加えずに接着剤を硬化させた。 As a comparative example, a similar lens barrel was assembled in the same process as in the above example, but the adhesive was cured without applying a load to the lens without using the load jig of the example.

上記実施例及び比較例のレンズ鏡筒を接着剤硬化後にレンズの中心を通る断面で切断し、その切断断面で接着剤の厚さを測定した。測定個所は任意の８点とし、その厚さ測定結果を図１３（ｂ）に示す。 The lens barrels of the above examples and comparative examples were cut at a cross section passing through the center of the lens after curing the adhesive, and the thickness of the adhesive was measured at the cut cross section. The measurement points are arbitrary 8 points, and the thickness measurement results are shown in FIG.

図１３（ｂ）から分かるように、荷重冶具（４５ｇ）を用いた実施例では硬化後の接着剤の厚さが荷重冶具を用いない荷重なしの比較例と比べて、薄くなっており、その厚さのばらつきが小さくなっている。厚さのばらつきを標準偏差σで比較すると、比較例ではσ＝１．３５であるのに対し、実施例ではσ＝０．７１であり、実施例は接着剤厚さが比較例よりも均一性に優れていることが分かる。 As can be seen from FIG. 13 (b), in the example using the load jig (45g), the thickness of the adhesive after curing is thinner than the comparative example without a load jig without using the load jig. The variation in thickness is small. When the thickness variation is compared with the standard deviation σ, in the comparative example, σ = 1.35, whereas in the example, σ = 0.71, and in the example, the adhesive thickness is more uniform than in the comparative example. It turns out that it is excellent in property.

以上のように本発明を実施するための最良の形態及び実施例について説明したが、本発明はこれらに限定されるものではなく、本発明の技術的思想の範囲内で各種の変形が可能である。例えば、本実施の形態では、荷重冶具３１，４５は、ガラス材（ＢＫ７）から構成したが、本発明はこれに限定されず、パイレックスガラス、青板ガラス、白板ガラス等であってもよく、また、特に、３００ｎｍ以下の波長の光を吸収し、３００〜４５０ｎｍの波長を透過させる透光性材料（光吸収材料）であれば、ガラス材以外のものであってもよい。 As described above, the best modes and examples for carrying out the present invention have been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. is there. For example, in the present embodiment, the load jigs 31 and 45 are made of a glass material (BK7), but the present invention is not limited to this, and may be pyrex glass, blue plate glass, white plate glass, or the like. In particular, a material other than a glass material may be used as long as it is a translucent material (light absorbing material) that absorbs light having a wavelength of 300 nm or less and transmits light having a wavelength of 300 to 450 nm.

また、固定対象の光学素子は、レンズ以外のものであってもよいことは勿論であり、例えば、波長板や回折格子やミラー等であってもよい。 Of course, the optical element to be fixed may be other than a lens, and may be a wave plate, a diffraction grating, a mirror, or the like.

第１の実施の形態による光学素子固定方法を説明するためのレンズ固定構造及び紫外線（ＵＶ）光源・荷重冶具を示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows the lens fixing structure for demonstrating the optical element fixing method by 1st Embodiment, and an ultraviolet-ray (UV) light source and a load jig. 第２の実施の形態による光学素子固定方法を説明するためのレンズ固定構造及び荷重冶具を概略的に示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows roughly the lens fixing structure and load jig | tool for demonstrating the optical element fixing method by 2nd Embodiment. 第２の実施の形態による別の光学素子固定方法を説明するためのレンズ固定構造及び荷重冶具を概略的に示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows schematically the lens fixing structure and load jig | tool for demonstrating another optical element fixing method by 2nd Embodiment. 第２の実施の形態による別の光学素子固定方法を説明するためのレンズ固定構造及び荷重冶具を概略的に示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows schematically the lens fixing structure and load jig | tool for demonstrating another optical element fixing method by 2nd Embodiment. 第２の実施の形態による更に別の光学素子固定方法を説明するためのレンズ固定構造及び荷重冶具を概略的に示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows schematically the lens fixing structure and load jig | tool for demonstrating another optical element fixing method by 2nd Embodiment. 第３の実施の形態による光学素子固定方法を説明するためのレンズ固定構造及び荷重冶具・ＵＶ光源のノズル・位置決め部材を概略的に示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows roughly the lens fixing structure for demonstrating the optical element fixing method by 3rd Embodiment, the load jig, the nozzle of UV light source, and the positioning member. ３種類の樹脂材料（ＰＣ、ＡＰＬ、ＰＭＭＡ）の波長と光透過率との関係を示す光透過特性のグラフである。を示すIt is a graph of the light transmission characteristic which shows the relationship between the wavelength of three types of resin materials (PC, APL, PMMA) and light transmittance. Indicate 予備実験例１における紫外線照射時間と表面温度との関係を示すグラフである。6 is a graph showing a relationship between an ultraviolet irradiation time and a surface temperature in Preliminary Experimental Example 1. 予備実験例２におけるＵＶ光源と光強度センサ表面との距離と、波長３５０ｎｍのときの光強度との関係を示すグラフである。It is a graph which shows the relationship between the distance of UV light source and the light intensity sensor surface in the preliminary experiment example 2, and the light intensity at the wavelength of 350 nm. 予備実験例２におけるＵＶ光源と光強度センサ表面との距離と、波長２５０ｎｍのときの光強度との関係を示すグラフである。It is a graph which shows the relationship between the distance of the UV light source and light intensity sensor surface in the preliminary experiment example 2, and the light intensity at the wavelength of 250 nm. 予備実験例２におけるＵＶ光源と光強度センサ表面との距離と、波長４２０ｎｍのときの光強度との関係を示すグラフである。It is a graph which shows the relationship between the distance of UV light source and the light intensity sensor surface in the preliminary experiment example 2, and the light intensity at the wavelength of 420 nm. 予備実験例２におけるＵＶ光源と光強度センサ表面との距離と、光強度（全波長範囲）との関係を示すグラフである。It is a graph which shows the relationship between the distance of UV light source and the light intensity sensor surface in preliminary experiment example 2, and light intensity (all wavelength range). 実施例におけるレンズ固定構造を示す図（ａ）及び硬化後の接着剤の厚さ測定結果を示す図（ｂ）である。It is the figure (a) which shows the lens fixing structure in an Example, and the figure (b) which shows the thickness measurement result of the adhesive agent after hardening. 従来の光学素子固定方法を説明するためのレンズ固定構造及び紫外線（ＵＶ）光源を示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows the lens fixing structure and ultraviolet-ray (UV) light source for demonstrating the conventional optical element fixing method.

Explanation of symbols

１０レンズ（光学素子）
１１レンズ部（光学機能部）
１１ａ凸部
１２取付部
１３外周部
１５取付面（接着固定部）
２０レンズ鏡筒（固定部材）
２２保持面（接着固定部）
２９接着剤層（光硬化性接着剤）
３０紫外線（ＵＶ）光源
３１荷重冶具
３２遮光部材（光制限部）
４０レンズ鏡筒（固定部材）
４２保持面（接着固定部）
４５荷重冶具
４６凹部
４６ａ反射面（光制限部）
４７反射面（光導波部）
４９接着剤層（光硬化性接着剤）
５０レンズ（光学素子）
５１凸部（光学機能部）
５９接着剤層（光硬化性接着剤）
６１先端ノズル
６２位置決め部材
ａ紫外線
ｂ紫外線照射方向

10 Lens (optical element)
11 Lens part (optical function part)
11a Convex part 12 Mounting part 13 Outer peripheral part 15 Mounting surface (adhesion fixing part)
20 Lens barrel (fixing member)
22 Holding surface (adhesive fixing part)
29 Adhesive layer (photo-curable adhesive)
30 Ultraviolet (UV) light source 31 Load jig 32 Light shielding member (light limiting part)
40 Lens barrel (fixing member)
42 Holding surface (adhesive fixing part)
45 Load jig 46 Recess 46a Reflecting surface (light limiting part)
47 Reflecting surface (optical waveguide)
49 Adhesive layer (photo-curable adhesive)
50 lenses (optical elements)
51 Convex part (optical function part)
59 Adhesive layer (photo-curing adhesive)
61 Tip nozzle 62 Positioning member a UV b UV irradiation direction

Claims

An optical element fixing method in which an optical element is bonded and fixed to a fixing member with a photocurable adhesive,
After applying the photocurable adhesive to at least one of the adhesive fixing portion of the optical element and the adhesive fixing portion of the fixing member, a load is applied to the adhesive fixing portion via a load jig made of a translucent material. An optical element fixing method comprising: irradiating light to the photocurable adhesive from a light source through the load jig while adding.

The optical element fixing method according to claim 1, wherein the translucent material has a characteristic of absorbing light having a wavelength in a region not involved in the curing of the photocurable adhesive.

The optical element fixing method according to claim 1, wherein the translucent material has a characteristic of transmitting light having a wavelength in a region involved in the curing of the photocurable adhesive.

4. The optical element fixing method according to claim 1, wherein the translucent material absorbs light having a wavelength of 300 nm or less and transmits light having a wavelength in a range of 300 to 450 nm.

5. The optical element fixing according to claim 1, wherein the load jig includes a light limiting unit that limits light so that the optical function unit of the optical element is not irradiated with light during the light irradiation. Method.

The optical element fixing method according to any one of claims 1 to 5, wherein the load jig has an optical waveguide portion that guides light to the adhesive fixing portion during the light irradiation.

The optical element fixing method according to any one of claims 1 to 6, wherein the light irradiation is performed after positioning the fixing member, the optical element, the load jig, and the light source with a positioning member.

An optical element fixing structure in which an optical element is bonded and fixed to an adhesive fixing portion of a fixing member by an adhesive fixing portion, and the optical element is fixed by the optical element fixing method according to any one of claims 1 to 7. A method of manufacturing an optical element fixing structure, wherein the optical element fixing structure is manufactured by fixing to a fixing member.

The method of manufacturing an optical element fixing structure according to claim 8, wherein the optical element fixing structure is a structure for performing the light irradiation through the optical element to the adhesive fixing portion.