JP4566613B2 - Lens fixing method - Google Patents

Lens fixing method Download PDF

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Publication number
JP4566613B2
JP4566613B2 JP2004132601A JP2004132601A JP4566613B2 JP 4566613 B2 JP4566613 B2 JP 4566613B2 JP 2004132601 A JP2004132601 A JP 2004132601A JP 2004132601 A JP2004132601 A JP 2004132601A JP 4566613 B2 JP4566613 B2 JP 4566613B2
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lens
laser light
portions
laser
light irradiation
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JP2005316044A (en
JP2005316044A5 (en
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真人 清田
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Canon Inc
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Canon Inc
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Priority to JP2004132601A priority Critical patent/JP4566613B2/en
Priority to TW094109657A priority patent/TWI303725B/en
Priority to US11/113,596 priority patent/US7286307B2/en
Priority to CNB2005100667548A priority patent/CN100416327C/en
Priority to CN 200810009461 priority patent/CN101290386B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers

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  • Lens Barrels (AREA)
  • Mounting And Adjusting Of Optical Elements (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

本発明は、光学機器に関する。   The present invention relates to an optical apparatus.

カメラ、ビデオ等の光学機器において、従来から様々なレンズを固定する方法が提案されているが、近年、カメラやビデオが小型化されてきたことにより、レンズを固定するためのスペースが少なくなり、接着剤を用いたレンズ固定方法が一般的に用いられている。   In optical devices such as cameras and videos, various methods for fixing various lenses have been proposed. However, in recent years, cameras and videos have been downsized to reduce the space for fixing lenses. A lens fixing method using an adhesive is generally used.

また、熱かしめと呼ばれるレンズ枠の一部を熱変形させることでレンズを固定する方法も用いられている。   A method of fixing a lens by thermally deforming a part of a lens frame called heat caulking is also used.

また、レンズをプラスチックで形成したものについては、プラスチックで形成されたレンズ枠等にレーザ光を用いて固定する方法も提案されている。たとえば、特開２００４−２０８６７号に提案されているように、プラスチック製のレンズをプラスチック製のレンズ枠やファインダ枠等にレーザ光を照射して固定する方法が提案されている。
特開２００４−２０８６７号 For a lens formed of plastic, a method of fixing the lens frame or the like formed of plastic with a laser beam has been proposed. For example, as proposed in Japanese Patent Application Laid-Open No. 2004-20867, a method of fixing a plastic lens by irradiating a plastic lens frame, a finder frame or the like with laser light has been proposed.
JP 2004-20867

従来用いられている、接着剤を用いてレンズをレンズ枠に固定する方法の場合、接着剤のレンズ有効径内へのはみ出し、レンズ枠外へのはみ出し等の問題があり、工程管理が大変であった。   The conventional method of fixing a lens to a lens frame using an adhesive has problems such as protrusion of the adhesive into the lens effective diameter and protrusion of the lens frame, and process management is difficult. It was.

また、接着剤の硬化時の収縮によりレンズの歪の原因となる。さらに、接着剤塗布量の場所による不均一性による変形により、所望の光学性能が得られないことがある。   Also, the shrinkage of the adhesive during curing causes distortion of the lens. Furthermore, the desired optical performance may not be obtained due to deformation due to non-uniformity depending on the location of the adhesive application amount.

また、レンズ等の光学部品の接着に用いられる接着剤として、紫外線硬化型樹脂が挙げられる。該接着剤は硬化に必要な紫外線照射時間が数秒〜数十秒掛かる。さらに、完全な硬化までには更に時間が掛かるために、偏芯調整などのレンズ位置調整を行っても、接着剤の完全な硬化までの間に収縮の不均一によりレンズ位置が徐々に変化してしまい、所望の位置とずれてしまうという問題がある。   Moreover, an ultraviolet curable resin is mentioned as an adhesive agent used for adhesion | attachment of optical components, such as a lens. This adhesive takes several seconds to several tens of seconds to irradiate ultraviolet rays necessary for curing. Furthermore, since it takes more time to complete curing, even if lens position adjustment such as eccentricity adjustment is performed, the lens position gradually changes due to non-uniform shrinkage before the adhesive is completely cured. Therefore, there is a problem that it is displaced from a desired position.

また、プラスチックレンズの場合、強度の紫外線照射により黄変する特徴があるため、これによりレンズのカラーバランスが変化してしまうという問題がある。   In addition, the plastic lens has a feature that it is yellowed by irradiation with intense ultraviolet rays, which causes a problem that the color balance of the lens changes.

また、熱かしめによるレンズ固定方法では、必要部分以外の広い範囲にも熱が伝わり、レンズ枠の必要部分以外を変形させる恐れもある。レンズやレンズ枠が小型になり、他の部品の取り付け部等が接近しているとその影響が更に増すことになる。レンズにも過度に熱が伝わると変形を生じるという問題もある。   Further, in the lens fixing method by heat caulking, heat is transmitted to a wide range other than the necessary part, and there is a possibility that the part other than the necessary part of the lens frame is deformed. If the lens and the lens frame are reduced in size and the attachment parts of other components are close to each other, the influence is further increased. There is also a problem that the lens is deformed when heat is transmitted to the lens excessively.

上記紫外線硬化型の接着や熱かしめによるレンズ固定方法に対する問題点を解決する方法として、プラスチックレンズをレーザ光吸収プラスチックで形成されたレンズ枠等の部品にレーザ溶着する方法が挙げられるが、溶着するレンズはプラスチック製である必要があった。また、レンズの位置決め部全体をライン走査させてレーザ照射していたために、溶着後の位置変化が起きる可能性があった。   As a method for solving the problems with the lens fixing method by the UV curable adhesion or heat caulking, there is a method of laser welding a plastic lens to a component such as a lens frame formed of a laser light absorbing plastic. The lens had to be made of plastic. In addition, since the entire lens positioning portion was scanned with a line and irradiated with laser, there was a possibility that the position change after welding occurred.

本発明は上記問題を解決するためになされたもので、接着剤を用いずに、レーザ光による溶着を利用し、レンズを高速・高精度に、固定強度を一定に固定できる方法を提供することである。   The present invention has been made to solve the above problems, and provides a method for fixing a lens at a high speed, high accuracy, and a fixed strength by using laser beam welding without using an adhesive. It is.

上記課題を鑑み本発明は、少なくとも１枚のレンズと、レーザ光吸収プラスチックで形成されたレンズ枠とを有するレンズユニットにおけるレンズ固定方法において、前記レンズ枠には複数の位置決め部および複数のレーザ光照射部が形成され、前記レンズが前記複数の位置決め部と接触し、前記レンズが前記複数のレーザ光照射部と接触しないように、前記レンズを前記レンズ枠に嵌め込み、前記レンズを前記レンズ枠に嵌め込んだ後、複数のレーザ光を略同時に前記複数のレーザ光照射部に照射することで、前記複数のレーザ光照射部が溶融し、溶融した前記複数のレーザ光照射部が熱膨張することで、前記レンズと接触することを特徴とする。 In view of the above problems, the present invention provides a lens fixing method in a lens unit having at least one lens and a lens frame formed of a laser light absorbing plastic, wherein the lens frame includes a plurality of positioning portions and a plurality of laser beams. irradiation portion is formed, the lens is in contact with the plurality of positioning portions, so that the lens is not in contact with said plurality of laser beam irradiation unit, fitted to the lens to the lens frame, the lens to the lens frame After the fitting, by irradiating the plurality of laser light irradiation portions substantially simultaneously with the plurality of laser light irradiation portions, the plurality of laser light irradiation portions are melted, and the melted laser light irradiation portions are thermally expanded. And contacting with the lens .

以上のように、本発明のレンズ固定方法によれば、接着剤や他部品を追加することなく、省スペースで高速に・高精度にレンズを固定することができる。   As described above, according to the lens fixing method of the present invention, the lens can be fixed at high speed and with high accuracy in a small space without adding an adhesive or other parts.

また、複数のレンズを略同時に固定することができるので、工数を大幅に減少させることが出来る。   In addition, since a plurality of lenses can be fixed substantially simultaneously, the number of man-hours can be greatly reduced.

また、位置決め調整の為に、レンズの位置を多少ずらしても溶着部の条件が変わることが無いので、レーザ装置の位置や設定を変更することも必要なく、固定強度を均一に保つことが出来る。   In addition, because of the positioning adjustment, even if the position of the lens is slightly shifted, the condition of the welded portion does not change, so there is no need to change the position or setting of the laser device, and the fixing strength can be kept uniform. .

また、複数の溶着部が弱い弾性変形部を有するようにすると、レンズの位置を一定に保とうとする力が働き、位置精度がより変化しにくく、衝撃にも強いという効果もある。   In addition, if the plurality of welded portions have weak elastic deformation portions, a force that keeps the position of the lens constant is exerted, so that the positional accuracy is less likely to change, and there is also an effect that it is resistant to impact.

（実施例１）
図１は第一の実施例でのレンズ固定方法の構成を示す断面斜視図である。 Example 1
FIG. 1 is a cross-sectional perspective view showing the configuration of the lens fixing method in the first embodiment.

組立順序を説明する。レンズ枠１３に、第一レンズ１１を、第一レンズの位置決め部１３ｈに嵌めこみ、第一レンズの位置決め部１１ａと当接させる。次に第二レンズ１２を、第二レンズの位置決め部１３ａに嵌めこみ、第二レンズの位置決め部１２ａと当接させる。この状態で、光軸Ｚ１と、第一レンズ１１の光軸と、第二レンズ１２の光軸を揃える。第一レンズ１１の外周寸法及び第二レンズ１２の外周寸法に対して、レンズ枠１３の壁部１３ｉ、１３ｅは僅かに大きくなっているために、図示しない手段によって、それぞれのレンズの光軸を光軸Ｚ１に揃えることが可能となっている。その後、レンズ上方から複数箇所を同時にスポット的にレーザ光を照射する。レーザ光の照射は、第一レンズに対するレーザ光照射１４ｂを行った後、第二レンズに対するレーザ光照射１４ａを行ってもよいし、両方のレンズに対して同時に照射してもよい。また、どちらか一方のレンズに接着剤等による固定を行った後、他方のレンズに対してレーザ光照射を行うようにしてもよい。また、固定強度を増す為に、レーザ光照射位置を変えて、再度レーザ照射１４ｃを行うようにしてもよい。   The assembly order will be described. The first lens 11 is fitted into the lens frame 13 in the first lens positioning portion 13h and brought into contact with the first lens positioning portion 11a. Next, the second lens 12 is fitted into the positioning part 13a of the second lens and brought into contact with the positioning part 12a of the second lens. In this state, the optical axis Z1, the optical axis of the first lens 11, and the optical axis of the second lens 12 are aligned. Since the wall portions 13i and 13e of the lens frame 13 are slightly larger than the outer peripheral dimension of the first lens 11 and the outer peripheral dimension of the second lens 12, the optical axis of each lens is adjusted by means not shown. It is possible to align with the optical axis Z1. Thereafter, the laser beam is irradiated in a spot simultaneously from above the lens. The laser light irradiation may be performed by irradiating the second lens with the laser light 14a after performing the laser light irradiation 14b on the first lens, or may irradiate both lenses simultaneously. Further, after fixing one of the lenses with an adhesive or the like, the other lens may be irradiated with laser light. Further, in order to increase the fixing strength, the laser irradiation position may be changed and the laser irradiation 14c may be performed again.

レーザ光はレンズを殆ど透過するので、その殆どのエネルギーは、レンズ枠１３に到達する。レンズ枠は、レーザ波長に対して吸収するプラスチックで成形されている。   Since the laser light is almost transmitted through the lens, most of the energy reaches the lens frame 13. The lens frame is formed of a plastic that absorbs the laser wavelength.

図２は、レーザ光を照射してレンズを固定する方法を示す断面図である。   FIG. 2 is a cross-sectional view showing a method of fixing a lens by irradiating a laser beam.

レーザ光１４ａ及び１４ｂを同時に照射した場合の例を説明する。レーザ光１４ａ、１４ｂはレンズ枠のそれぞれのレンズ位置決め部１３ａ、１３ｈで吸収され、熱に変化してレーザ光照射部の周囲を溶解させる。この溶解したレンズ枠を構成するプラスチックは、第一レンズとの当接部１１ａ及び第二レンズとの当接部１２ａのレンズ表面の微少な凹凸部に入り込む。   An example in which the laser beams 14a and 14b are simultaneously irradiated will be described. The laser beams 14a and 14b are absorbed by the lens positioning portions 13a and 13h of the lens frame, and change into heat to dissolve the periphery of the laser beam irradiation unit. The plastic constituting the melted lens frame enters a minute uneven portion on the lens surface of the contact portion 11a with the first lens and the contact portion 12a with the second lens.

レーザ照射を停止すると、溶解したプラスチックは急激に冷却され、収縮するが、レンズ表面の微少凹凸部に入り込んだプラスチックは少なくとも一部が残る状態となるため、レンズとレンズ枠が固定される。このレンズ固定部がレンズ位置決め部１３ａ及び１３ｈの複数の箇所に、同時に生じることにより、固定される第一のレンズ１１及び第二のレンズ１２は、光軸Ｚ１に対して、傾くことなく固定される。   When the laser irradiation is stopped, the melted plastic is rapidly cooled and contracted, but at least a part of the plastic that has entered the minute irregularities on the lens surface remains, so that the lens and the lens frame are fixed. The first lens 11 and the second lens 12 to be fixed are fixed without tilting with respect to the optical axis Z1 by the lens fixing portions occurring simultaneously at a plurality of positions of the lens positioning portions 13a and 13h. The

図１１は、本実施例１のレンズ組立方法で組み立てられた、レーザ照射方向とは反対側から見たレンズ組立体の断面斜視図である。   FIG. 11 is a cross-sectional perspective view of the lens assembly assembled by the lens assembling method of the first embodiment and viewed from the side opposite to the laser irradiation direction.

（実施例２）
図３は第２の実施例でのレンズ固定方法の構成を示す断面斜視図である。 (Example 2)
FIG. 3 is a cross-sectional perspective view showing the configuration of the lens fixing method in the second embodiment.

組立順序を説明する。レンズ枠２３に、第一レンズ２１は図３の下方からレンズ枠２３のレンズ固定部２３ｆに当接された後、熱カシメ等の手段で２３ｇ部を変形させることで固定されている。   The assembly order will be described. The first lens 21 is fixed to the lens frame 23 by contacting the lens fixing portion 23f of the lens frame 23 from below in FIG. 3 and then deforming the 23g portion by means such as thermal caulking.

次に第二レンズ２２を、第二レンズの位置決め部２３ａに嵌めこみ、第二レンズの位置決め部２２ａと当接させる。レンズ枠２３には複数のレーザ照射部２３ｂが設けられていて、第二レンズ２２の外周隅部２２ｂと対向しているが、接触はしていない。この状態で、光軸Ｚ１と、第一レンズ２１の光軸と、第二レンズ２２の光軸を揃える。第二レンズ２２の外周寸法に対して、レンズ枠２３の壁部２３ｅは僅かに大きくなっているために、実施例１と同様に図示しない手段によって、第二レンズ２２の光軸を光軸Ｚ１に揃えることが可能となっている。その後、レンズ上方から複数箇所を同時にスポット的にレーザ光を照射するが、照射方向を光軸に対して平行にしてもよいが、レーザ照射部２３ｂに対して垂直な方向から照射するようにしてもよい。また、複数のレーザ光照射２４ａを行った後に、別の複数のレーザ光照射部に、レーザ光照射２４ｃを行うようにしてもよい。   Next, the second lens 22 is fitted into the positioning part 23a of the second lens and brought into contact with the positioning part 22a of the second lens. The lens frame 23 is provided with a plurality of laser irradiation portions 23b and faces the outer peripheral corner portion 22b of the second lens 22, but is not in contact therewith. In this state, the optical axis Z1, the optical axis of the first lens 21, and the optical axis of the second lens 22 are aligned. Since the wall portion 23e of the lens frame 23 is slightly larger than the outer peripheral dimension of the second lens 22, the optical axis of the second lens 22 is changed to the optical axis Z1 by means not shown in the same manner as in the first embodiment. It is possible to align. Thereafter, the laser beam is irradiated spotwise from above the lens at the same time, but the irradiation direction may be parallel to the optical axis, but the laser irradiation unit 23b is irradiated from a perpendicular direction. Also good. Further, after performing the plurality of laser light irradiations 24a, the laser light irradiation 24c may be performed on another plurality of laser light irradiation units.

図４は、レーザ光を照射してレンズを固定する方法を示す断面図である。   FIG. 4 is a cross-sectional view showing a method of fixing a lens by irradiating a laser beam.

レーザ光２４ａはレンズを透過し、レンズ枠のレーザ照射部２３ａで吸収され、熱に変化してレーザ光照射部の周囲を溶解させる。この溶解したレンズ枠を構成するプラスチックは、熱膨張することで、第二レンズ２２の外周隅部２２ｂと接触し、レンズ表面の微少な凹凸部に入り込む。   The laser beam 24a passes through the lens, is absorbed by the laser irradiation unit 23a of the lens frame, changes to heat, and dissolves the periphery of the laser beam irradiation unit. The plastic constituting the melted lens frame is thermally expanded to come into contact with the outer peripheral corner portion 22b of the second lens 22 and enter a minute uneven portion on the lens surface.

レーザ照射を停止すると、溶解したプラスチックは急激に冷却され、収縮するが、レンズ表面の微少凹凸部に入り込んだプラスチックは少なくとも一部を残した状態となるため、レンズとレンズ枠が固定される。このレンズ溶着部２３ｂ、２２ｂとレンズ位置決め部２３ａが離れているため、レンズ位置決め部２３ｂが熱変形することは無い。また、レンズ溶着部２３ｂ、２２ｂは複数の箇所に、略同時に生じることにより、固定される第二のレンズ２２は、光軸Ｚ１に対して、傾くことなく固定される。   When the laser irradiation is stopped, the melted plastic is rapidly cooled and contracted, but the plastic that has entered the minute irregularities on the lens surface is left in a state where at least a part thereof is left, so that the lens and the lens frame are fixed. Since the lens welded portions 23b and 22b are separated from the lens positioning portion 23a, the lens positioning portion 23b is not thermally deformed. Further, the lens welded portions 23b and 22b are formed at a plurality of locations substantially simultaneously, whereby the second lens 22 to be fixed is fixed without being inclined with respect to the optical axis Z1.

図１２は、本実施例２のレンズ組立方法で組み立てられた、レーザ照射方向とは反対側から見たレンズ組立体の断面斜視図である。   FIG. 12 is a cross-sectional perspective view of the lens assembly assembled by the lens assembling method of the second embodiment and viewed from the side opposite to the laser irradiation direction.

（実施例３）
図５は第３の実施例でのレンズ固定方法の構成を示す断面斜視図であり、図６はレーザ光を照射してレンズを固定する方法を示す断面図であるが、実施例２に対して異なる部分のみ説明する。 (Example 3)
FIG. 5 is a cross-sectional perspective view showing a configuration of a lens fixing method in the third embodiment, and FIG. 6 is a cross-sectional view showing a method of fixing the lens by irradiating laser light. Only different parts will be described.

第二レンズ３２は、第二レンズの位置決め部３３ａに嵌めこみ、第二レンズの位置決め部３２ａと当接させる。レンズ枠３３には、レンズ位置決め部３３ａとレーザ光照射部３３ｂとが交互に複数設けられていて、レーザ光照射部３３ｂはレンズ位置決め部３３ａより低くなっていて、第二レンズ３２とは隙間ｓを有している。この状態で、光軸Ｚ１と、第一レンズ３１の光軸と、第二レンズ３２の光軸を、実施例１と同様に揃える。レーザ光３４ａは、レンズ枠のレーザ光照射部３３ａで吸収され、熱に変化してレーザ光照射部の周囲を溶解させる。この溶解したレンズ枠を構成するプラスチックは、熱膨張することで、第二レンズ３２の位置決め部３２ａと接触し、レンズ表面の微少な凹凸部に入り込む。尚、隙間ｓは０＜ｓ＜０．１であることが好ましく、これより大きいと、レンズ枠を熱膨張させて、レンズと接触させるためのエネルギーが多く必要となり、溶解体積も大きく、周囲への熱の影響も大きくなる。   The second lens 32 is fitted into the positioning part 33a of the second lens and is brought into contact with the positioning part 32a of the second lens. A plurality of lens positioning portions 33a and laser light irradiation portions 33b are alternately provided in the lens frame 33. The laser light irradiation portions 33b are lower than the lens positioning portions 33a and are spaced from the second lens 32 by a gap s. have. In this state, the optical axis Z1, the optical axis of the first lens 31, and the optical axis of the second lens 32 are aligned in the same manner as in the first embodiment. The laser beam 34a is absorbed by the laser beam irradiation unit 33a of the lens frame, and is changed into heat to dissolve the periphery of the laser beam irradiation unit. The plastic constituting the melted lens frame is thermally expanded to come into contact with the positioning portion 32a of the second lens 32 and enter a minute uneven portion on the lens surface. The gap s is preferably 0 <s <0.1. If the gap s is larger than this, a large amount of energy is required for thermally expanding the lens frame and bringing it into contact with the lens. The effect of heat increases.

レーザ照射を停止すると、溶解したプラスチックは急激に冷却され、収縮するが、レンズとの当接部に入り込んだプラスチックは少なくとも一部を残した状態となるため、レンズとレンズ枠が固定される。このレンズ溶着部３３ｂ、３２ａとレンズ位置決め部３３ａが離れているため、レンズ位置決め部３３ｂが熱変形することは無い。また、レンズ枠３３のレンズ溶着部３３ｂの裏側に肉抜き部３３ｄを設けて、周囲より薄肉化されている。この肉抜き部３３ｄにより、収縮作用が急激に進行するとともに、固定された後も薄肉化による弾性力を保持した状態となる。レンズ溶着部３３ｂ、３２ａは複数の箇所に、略同時に生じることにより、固定される第二のレンズ３２は、光軸Ｚ１に対して、傾くことなく固定され、更に、前記弾性力によるレンズ位置決め部３３ａへの押し当て力を有し、また、衝撃等によるレンズへの外力に対して復元力をも有している。   When the laser irradiation is stopped, the melted plastic is rapidly cooled and contracted, but the plastic that has entered the contact portion with the lens is left at least partially, so that the lens and the lens frame are fixed. Since the lens welding portions 33b and 32a and the lens positioning portion 33a are separated from each other, the lens positioning portion 33b is not thermally deformed. Further, a thinned portion 33d is provided on the back side of the lens welded portion 33b of the lens frame 33 so as to be thinner than the surroundings. Due to the thinned portion 33d, the contraction action proceeds rapidly, and the elastic force due to the thinning is maintained even after being fixed. When the lens welded portions 33b and 32a are generated at a plurality of locations substantially simultaneously, the second lens 32 to be fixed is fixed without tilting with respect to the optical axis Z1, and further, the lens positioning portion by the elastic force. It has a pressing force to 33a, and also has a restoring force against an external force to the lens due to an impact or the like.

図１３は、本実施例３のレンズ組立方法で組み立てられた、レーザ照射方向とは反対側から見たレンズ組立体の断面斜視図である。   FIG. 13 is a cross-sectional perspective view of the lens assembly assembled by the lens assembling method of the third embodiment and viewed from the side opposite to the laser irradiation direction.

（実施例４）
図７は第４の実施例でのレンズ固定方法の構成を示す断面斜視図であり、図８はレーザ光を照射してレンズを固定する方法を示す断面図であるが、実施例３に対して異なる部分のみ説明する。 Example 4
7 is a cross-sectional perspective view showing a configuration of a lens fixing method in the fourth embodiment, and FIG. 8 is a cross-sectional view showing a method of fixing the lens by irradiating a laser beam. Only different parts will be described.

レンズ枠４３には、レンズ位置決め部４３ａとレーザ光照射面４３ｂとが交互に複数設けられている。更にレーザ光照射面４３ｂ上に凸部４３ｃを設けている。レーザ光照射面４３ｂはレンズ位置決め部４３ａより低くなっていて、更にレーザ光照射面４３ｂ上の凸部４３ｃは、第二レンズ４２とは接触していない。従って、他の実施例と同様に、光軸調整のために第二レンズ４２を多少動かしても位置決め精度には影響がなく、光軸を揃えることができる。   The lens frame 43 is provided with a plurality of lens positioning portions 43a and laser light irradiation surfaces 43b alternately. Furthermore, the convex part 43c is provided on the laser beam irradiation surface 43b. The laser light irradiation surface 43 b is lower than the lens positioning portion 43 a, and the convex portion 43 c on the laser light irradiation surface 43 b is not in contact with the second lens 42. Therefore, as in the other embodiments, even if the second lens 42 is moved a little to adjust the optical axis, the positioning accuracy is not affected and the optical axes can be aligned.

実施例３では、レーザ光照射部が均一高さの平面であったが、本実施例４ではレーザ光照射部を、レーザ光照射面上の凸部４３ｃとし、レーザ光照射部と、位置決め部との差異を明確にし、位置決め部に伝わる熱の影響を少なくした。   In Example 3, the laser light irradiation part was a flat plane, but in Example 4, the laser light irradiation part was a convex part 43c on the laser light irradiation surface, and the laser light irradiation part and positioning part The effect of heat transmitted to the positioning part was reduced.

尚、レーザ光照射面４３ｂ上の凸部４３ｃの形状は球状に限定するものではなく、円柱形、角柱形状等でもよい。   In addition, the shape of the convex part 43c on the laser beam irradiation surface 43b is not limited to a spherical shape, and may be a cylindrical shape, a prismatic shape, or the like.

（実施例５）
図９は第４の実施例でのレンズ固定方法の構成を示す断面斜視図であり、図１０はレーザ光を照射してレンズを固定する方法を示す断面図であるが、実施例４に対して異なる部分のみ説明する。 (Example 5)
FIG. 9 is a cross-sectional perspective view showing a configuration of a lens fixing method in the fourth embodiment, and FIG. 10 is a cross-sectional view showing a method of fixing the lens by irradiating a laser beam. Only different parts will be described.

レンズ枠５３には、レンズ位置決め部５３ａとレーザ光照射部５３ｂとが交互に複数設けられていて、レーザ光照射部の周囲が切り欠かれていて、レンズ枠５３の壁部５３ｅから切り離されている。更にレーザ光照射面５３ｂ上に凸部５３ｃを設けている。第二レンズ５２は、レンズ枠との位置決め面である５２ａと、レーザ光照射部５３ｃと対向する斜面５２ｂを有しており、レーザ光照射面５３ｂ上の凸部５３ｃにレーザ光５４を照射することにより、既述の実施例と同様にレンズを固定するが、レーザ光照射部５３ｂの周囲が切り欠かれていることで、レーザ光照射後の熱収縮力がレンズ５２をレンズ位置決め部５３ａの方向に、他の実施例よりも働きやすくなるとともに、レーザ光照射部５３ｂに弾性力が働きやすくなっており、レンズが衝撃で外れることを、他の実施例よりも防止する効果を有している。   The lens frame 53 is provided with a plurality of lens positioning portions 53a and laser light irradiation portions 53b alternately. The periphery of the laser light irradiation portion is cut out and separated from the wall portion 53e of the lens frame 53. Yes. Furthermore, the convex part 53c is provided on the laser beam irradiation surface 53b. The second lens 52 has a positioning surface 52a for the lens frame and an inclined surface 52b facing the laser light irradiation part 53c, and irradiates the convex part 53c on the laser light irradiation surface 53b with the laser light 54. As a result, the lens is fixed in the same manner as in the above-described embodiment. However, since the periphery of the laser beam irradiation unit 53b is cut away, the thermal contraction force after the laser beam irradiation causes the lens 52 to move to the lens positioning unit 53a. It is easier to work in the direction than in the other embodiments, and the elastic force is more likely to act on the laser beam irradiation portion 53b, which has the effect of preventing the lens from coming off due to impact than in the other embodiments. Yes.

また、各実施例の形態において、複数箇所を同時に照射するレーザ光は、厳密には同時ではなく、レンズの位置精度に影響が無い程度の時間差、例えば数十ｍｓ〜数百ｍｓの時間差で照射されるようにしてもよい。   Further, in each embodiment, the laser beams for irradiating a plurality of locations at the same time are not strictly the same, but are irradiated with a time difference that does not affect the positional accuracy of the lens, for example, a time difference of several tens ms to several hundred ms. You may be made to do.

また、各実施例の形態において、固定されるレンズがガラスレンズである場合、レンズの溶着部表面をレンズ曲面部より粗い加工状態にしたり、プライマー処理を施して、溶融したプラスチックとの溶着強度を増すようにしてもよい。   Further, in the form of each example, when the lens to be fixed is a glass lens, the surface of the welded part of the lens is processed to be rougher than the curved surface part of the lens, or a primer treatment is performed to increase the welding strength with the molten plastic. You may make it increase.

また、各実施例の形態において、固定されるレンズがプラスチックで成形されたレンズでもよい。   In each embodiment, the lens to be fixed may be a lens formed of plastic.

この場合、レーザ光照射により溶融したレンズ枠の熱で、プラスチックレンズの一部も溶融し、レンズ枠を形成するプラスチックと化学結合することで、溶着するようにしてもよい。   In this case, a part of the plastic lens may be melted by the heat of the lens frame melted by the laser light irradiation and chemically bonded to the plastic forming the lens frame to be welded.

また、固定される被固定物は、レンズに限定されるものではなく、透明なガラス板やプラスチック板、光学フィルター等の光学素子でもよい。   The fixed object to be fixed is not limited to a lens, and may be an optical element such as a transparent glass plate, a plastic plate, or an optical filter.

第１実施例のレンズ組立の構成を示す断面斜視図である。It is a cross-sectional perspective view which shows the structure of the lens assembly of 1st Example. 第１実施例のレンズ組立の方法を示す断面図である。It is sectional drawing which shows the method of the lens assembly of 1st Example. 第２実施例のレンズ組立の構成を示す断面斜視図である。It is a cross-sectional perspective view which shows the structure of the lens assembly of 2nd Example. 第２実施例のレンズ組立の方法を示す断面である。It is a cross section which shows the method of lens assembly of 2nd Example. 第３実施例のレンズ組立の構成を示す断面斜視図である。It is a cross-sectional perspective view which shows the structure of the lens assembly of 3rd Example. 第３実施例のレンズ組立の方法を示す断面図である。It is sectional drawing which shows the method of the lens assembly of 3rd Example. 第４実施例のレンズ組立の構成を示す断面斜視図である。It is a cross-sectional perspective view which shows the structure of the lens assembly of 4th Example. 第４実施例のレンズ組立の方法を示す断面である。It is a cross section which shows the method of lens assembly of 4th Example. 第５実施例のレンズ組立の構成を示す断面斜視図である。It is a cross-sectional perspective view which shows the structure of the lens assembly of 5th Example. 第５実施例のレンズ組立の方法を示す断面である。It is a cross section which shows the method of lens assembly of 5th Example. 第１実施例のレンズ組立方法で組み立てられた、レーザ照射方向とは反対側から見たレンズ組立体の断面斜視図である。It is a cross-sectional perspective view of the lens assembly assembled by the lens assembly method of the first embodiment and viewed from the side opposite to the laser irradiation direction. 第２実施例のレンズ組立方法で組み立てられた、レーザ照射方向とは反対側から見たレンズ組立体の断面斜視図である。It is a cross-sectional perspective view of the lens assembly assembled from the lens irradiation method according to the second embodiment and viewed from the side opposite to the laser irradiation direction. 第３実施例及び、第４実施例のレンズ組立方法で組み立てられた、レーザ照射方向とは反対側から見たレンズ組立体の断面斜視図である。It is a cross-sectional perspective view of the lens assembly assembled by the lens assembling method of the third embodiment and the fourth embodiment, viewed from the side opposite to the laser irradiation direction. 第５実施例のレンズ組立方法で組み立てられた、レーザ照射方向とは反対側から見たレンズ組立体の断面斜視図である。It is a cross-sectional perspective view of the lens assembly assembled by the lens assembly method of the fifth embodiment and viewed from the side opposite to the laser irradiation direction.

符号の説明Explanation of symbols

１１、２１、３１，４１、５１ 第一レンズ
１２、２２、３２、４２、５２ 第二レンズ
１３、２３、３３、４３、５３ レンズ枠
１３ａ、２３ａ、３３ａ、４３ａ、５３ａ 第二レンズ位置決め部
２３ｂ、３３ｂ、４３ｂ、５３ｂ レーザ照射部
４３ｃ、５３ｃ レーザ照射部
３３ｄ、３３ｄ、４３ｄ、５３ｄ 肉抜き部
１３ｅ、２３ｅ、３３ｅ、４３ｅ、５３ｅ レンズ枠壁部
２３ｆ、３３ｆ、４３ｆ、５３ｆ 第一レンズ保持部
２３ｇ、３３ｇ、４３ｇ、５３ｇ 第一レンズ固定部
１３ｈ 第一レンズ位置決め部
１３ｉ レンズ枠壁部
１４ａ、２４ａ、３４ａ、４４ａ、５４ａ レーザ光
１４ｂ レーザ光
２４ｃ、３４ｃ、４４ｃ、５４ｃ レーザ光
Ｚ１ 光軸 11, 21, 31, 41, 51 First lens 12, 22, 32, 42, 52 Second lens 13, 23, 33, 43, 53 Lens frame 13a, 23a, 33a, 43a, 53a Second lens positioning portion 23b , 33b, 43b, 53b Laser irradiation part 43c, 53c Laser irradiation part 33d, 33d, 43d, 53d Thinning part 13e, 23e, 33e, 43e, 53e Lens frame wall part 23f, 33f, 43f, 53f First lens holding part 23g, 33g, 43g, 53g First lens fixing part 13h First lens positioning part 13i Lens frame wall part 14a, 24a, 34a, 44a, 54a Laser light 14b Laser light 24c, 34c, 44c, 54c Laser light Z1 Optical axis

Claims (5)

少なくとも１枚のレンズと、レーザ光吸収プラスチックで形成されたレンズ枠とを有するレンズユニットにおけるレンズ固定方法において、
前記レンズ枠には複数の位置決め部および複数のレーザ光照射部が形成され、前記レンズが前記複数の位置決め部と接触し、前記レンズが前記複数のレーザ光照射部と接触しないように、前記レンズを前記レンズ枠に嵌め込み、
前記レンズを前記レンズ枠に嵌め込んだ後、複数のレーザ光を略同時に前記複数のレーザ光照射部に照射することで、前記複数のレーザ光照射部が溶融し、
溶融した前記複数のレーザ光照射部が熱膨張することで、前記レンズと接触することを特徴とするレンズ固定方法。 In a lens fixing method in a lens unit having at least one lens and a lens frame formed of a laser light absorbing plastic,
A plurality of positioning portions and a plurality of laser beam irradiation unit is formed in the lens frame, the lens is in contact with the plurality of positioning portions, so that the lens is not in contact with said plurality of laser beam irradiation unit, the lens In the lens frame ,
After the lens is fitted into the lens frame, by irradiating the plurality of laser light irradiation portions substantially simultaneously with the plurality of laser light irradiation portions, the plurality of laser light irradiation portions are melted,
The lens fixing method , wherein the plurality of melted laser beam irradiation portions are in thermal expansion to come into contact with the lens. 前記レンズ枠には、前記位置決め部および前記レーザ光照射部が交互に複数形成され、前記レーザ光照射部は前記位置決め部よりもレーザ光照射方向に低く形成されることを特徴とする請求項１に記載のレンズ固定方法。 2. The lens frame, wherein a plurality of the positioning portions and the laser light irradiation portions are alternately formed, and the laser light irradiation portions are formed lower in the laser light irradiation direction than the positioning portions. The lens fixing method according to 1. 前記レーザ光照射部の周囲に切り欠きが形成されていることを特徴とする請求項２に記載のレンズ固定方法。 The lens fixing method according to claim 2 , wherein a notch is formed around the laser light irradiation unit . 前記レーザ光照射部の表面が凸形状に形成されることを特徴とする請求項２または３に記載のレンズ固定方法。 The lens fixing method according to claim 2 or 3 , wherein a surface of the laser beam irradiation part is formed in a convex shape . 前記レーザ光照射部の裏側には肉抜き部が形成されることを特徴とする請求項２に記載のレンズ固定方法。 The lens fixing method according to claim 2 , wherein a thinned portion is formed on the back side of the laser light irradiation portion .
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US11/113,596 US7286307B2 (en) 2004-04-28 2005-04-25 Method for fixing optical member and optical unit
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CN100416327C (en) 2008-09-03

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