JP5003059B2

JP5003059B2 - Optical module and manufacturing method thereof

Info

Publication number: JP5003059B2
Application number: JP2006224623A
Authority: JP
Inventors: 大助佐谷
Original assignee: Nikon Corp
Current assignee: Nikon Corp
Priority date: 2006-08-21
Filing date: 2006-08-21
Publication date: 2012-08-15
Anticipated expiration: 2026-08-21
Also published as: JP2008046563A

Description

本発明はカメラ等に組み込まれる光学モジュールについて、該光学モジュールの光学部材と保持部材との取付構造に関する。 The present invention relates to an optical module incorporated in a camera or the like and a mounting structure between an optical member and a holding member of the optical module.

カメラ等に組み込まれる焦点検出装置では、二次結像レンズの位置ずれがあると測距誤差が生じる。そのため、上記の焦点検出装置をはじめとする光学モジュールでは、保持部材にレンズを高い精度で位置決めして固定することが要求される。特に近年では、光学モジュールの組み立てにおいて、レーザー光による融着で保持部材にレンズを固定する手法が提案されている。例えば、特許文献１に上記の光学モジュールの構成の一例を示す。
特開２００５−３１６０４５号公報 In a focus detection device incorporated in a camera or the like, a distance measurement error occurs if the secondary imaging lens is misaligned. Therefore, in the optical module including the above-described focus detection apparatus, it is required to position and fix the lens to the holding member with high accuracy. Particularly in recent years, in assembling an optical module, a method for fixing a lens to a holding member by fusion with a laser beam has been proposed. For example, Patent Document 1 shows an example of the configuration of the optical module.
JP 2005-316045 A

しかし、従来の技術では、レーザー融着で保持部材にレンズを単に固定しているにすぎない。そのため、レーザー光の照射量などの加工条件の設定によっては、融着後のレンズの位置決め精度が十分に確保できない点で改善の余地があった。
本発明は上記従来技術の課題を解決するためのものである。本発明の目的は、高い位置決め精度でレンズを強固に固定できる光学モジュールおよびその製造方法を提供することである。 However, in the conventional technique, the lens is simply fixed to the holding member by laser fusion. For this reason, there is room for improvement in that the positioning accuracy of the lens after fusion cannot be sufficiently secured depending on the setting of processing conditions such as the amount of laser beam irradiation.
The present invention is to solve the above-mentioned problems of the prior art. An object of the present invention is to provide an optical module capable of firmly fixing a lens with high positioning accuracy and a method for manufacturing the same.

第１の発明は、レンズ部および取付部を有するレンズ部材と、取付部でレンズ部材を保持する保持部材とを有する光学モジュールである。取付部は、照射されたレーザー光を透過する被融着部と、レンズ部の光軸方向の位置決め基準となる第１位置決め部と、を有する。被融着部および第１位置決め部は、光軸方向と交差する平面方向に間隔をおいて配置される。保持部材は、取付部よりもレーザー光の波長の吸収率が高い材質で形成されているとともに、被融着部に対向して配置されてレーザー光により被融着部と融着する融着部と、融着した状態で第１位置決め部と当接してレンズ部材を位置決めする第２位置決め部と、を有する。融着部および第２位置決め部は、上記の平面方向に間隔をおいて配置される。また、レンズ部材において、被融着部に対応する部分の光軸方向の厚みが、第１位置決め部に対応する部分の光軸方向の厚みよりも薄い。 1st invention is an optical module which has a lens member which has a lens part and an attaching part, and a holding member which holds a lens member by an attaching part. The mounting portion includes a fused portion that transmits the irradiated laser light and a first positioning portion that serves as a positioning reference for the lens portion in the optical axis direction. The fused part and the first positioning part are arranged at an interval in a plane direction intersecting the optical axis direction. The holding member is made of a material having a higher absorption rate of the laser beam wavelength than the mounting portion, and is disposed opposite to the fused portion and fused to the fused portion by the laser beam. And a second positioning portion that contacts the first positioning portion and positions the lens member in a fused state. The fused part and the second positioning part are arranged at intervals in the plane direction. In the lens member, the thickness in the optical axis direction of the portion corresponding to the fused portion is thinner than the thickness in the optical axis direction of the portion corresponding to the first positioning portion.

第２の発明は、レンズ部および取付部を有するレンズ部材と、取付部でレンズ部材を保持する保持部材とを有する光学モジュールである。保持部材は、取付部よりもレーザー光の波長の透過率が高い材質で形成されているとともに、被融着部と、レンズ部の光軸方向の位置決め基準となる第２位置決め部と、を有する。被融着部および第２位置決め部は、光軸方向と交差する平面方向に間隔をおいて配置される。取付部は、被融着部に対向して配置されてレーザー光により被融着部と融着する融着部と、融着した状態で第２位置決め部と当接してレンズ部材を位置決めする第１位置決め部と、を有する。融着部および第１位置決め部は、上記の平面方向に間隔をおいて配置される。また、レンズ部材において、融着部に対応する部分の光軸方向の厚みが、第１位置決め部に対応する部分の光軸方向の厚みよりも薄い。 2nd invention is an optical module which has a lens member which has a lens part and an attaching part, and a holding member which holds a lens member by an attaching part. The holding member is formed of a material having a higher transmittance of the wavelength of the laser beam than the mounting portion, and has a fused portion and a second positioning portion that serves as a positioning reference in the optical axis direction of the lens portion. . The fused part and the second positioning part are arranged at an interval in a plane direction intersecting the optical axis direction. The attachment portion is disposed opposite the fusion-bonded portion and is fused with the fusion-bonded portion by laser light, and the second positioning portion is contacted with the second positioning portion in the fused state to position the lens member. 1 positioning part. The fused part and the first positioning part are arranged at intervals in the plane direction. In the lens member, the thickness in the optical axis direction of the portion corresponding to the fused portion is thinner than the thickness in the optical axis direction of the portion corresponding to the first positioning portion.

第３の発明は、第２の発明において、取付部は、保持部材よりもレーザー光の波長の吸収率が高い材質で形成されている。
第４の発明は、レンズ部を有するレンズ部材を、保持部材に保持する光学モジュールの製造方法である。この発明では、レンズ部材よりもレーザー光の波長の吸収率が高い材質で保持部材を形成する。また、レンズ部材を保持部材に保持した状態で、保持部材に設けた融着部に向けてレーザー光をレンズ部材を介して照射することでレンズ部材および保持部材を融着する。そして、融着の際に、レンズ部材に設けた第１位置決め部と保持部材に設けた第２位置決め部とを当接させてレンズ部材を保持部材に位置決めする。なお、保持部材の融着部および第２位置決め部は、光学モジュールの光軸方向と交差する平面方向に間隔をおいて配置され、レンズ部材の被融着部および第１位置決め部は、上記の平面方向に間隔をおいて配置される。また、レンズ部材において、被融着部に対応する部分の光軸方向の厚みが、第１位置決め部に対応する部分の光軸方向の厚みよりも薄い。融着前にレンズ部材を保持部材に保持した状態では、レンズ部材および保持部材が融着部を介して接触するとともに、第１位置決め部および第２位置決め部が離間している。そして、融着の際に、融着部の融解によって第１位置決め部および第２位置決め部が当接する。 In a third aspect based on the second aspect, the mounting portion is formed of a material having a higher absorption rate of the wavelength of the laser beam than the holding member.
4th invention is a manufacturing method of the optical module which hold | maintains the lens member which has a lens part in a holding member. In the present invention, the holding member is formed of a material having a higher absorption rate of the wavelength of the laser beam than the lens member. Further, in a state where the lens member is held by the holding member, the lens member and the holding member are fused by irradiating a laser beam through the lens member toward the fusion portion provided in the holding member. Then, at the time of fusing, the lens member is positioned on the holding member by bringing the first positioning portion provided on the lens member into contact with the second positioning portion provided on the holding member. Note that the fused portion and the second positioning portion of the holding member are arranged at an interval in the plane direction intersecting the optical axis direction of the optical module, and the fused portion and the first positioning portion of the lens member are It arrange | positions at intervals in the plane direction. In the lens member, the thickness in the optical axis direction of the portion corresponding to the fused portion is thinner than the thickness in the optical axis direction of the portion corresponding to the first positioning portion. In a state where the lens member is held by the holding member before the fusion, the lens member and the holding member are in contact via the fusion part, and the first positioning part and the second positioning part are separated from each other. And in the case of melt | fusion, a 1st positioning part and a 2nd positioning part contact | abut by fusion | melting of a melt | fusion part.

第５の発明は、レンズ部を有するレンズ部材を、保持部材に保持する光学モジュールの製造方法である。この発明では、レンズ部材よりもレーザー光の波長の吸収率が高い被膜を保持部材に設けた融着部に形成する。また、レンズ部材を保持部材に保持した状態で、融着部に向けてレーザー光をレンズ部材を介して照射することでレンズ部材および保持部材を融着する。そして、融着の際に、レンズ部材に設けた第１位置決め部と保持部材に設けた第２位置決め部とを当接させてレンズ部材を保持部材に位置決めする。なお、保持部材の融着部および第２位置決め部は、光学モジュールの光軸方向と交差する平面方向に間隔をおいて配置され、レンズ部材の被融着部および第１位置決め部は、上記の平面方向に間隔をおいて配置される。また、レンズ部材において、被融着部に対応する部分の光軸方向の厚みが、第１位置決め部に対応する部分の厚みよりも薄い。融着前にレンズ部材を保持部材に保持した状態では、レンズ部材および保持部材が融着部を介して接触するとともに、第１位置決め部および第２位置決め部が離間している。そして、融着の際に、融着部の融解によって第１位置決め部および第２位置決め部が当接する。 5th invention is a manufacturing method of the optical module which hold | maintains the lens member which has a lens part in a holding member. In the present invention, a film having a higher absorption rate of the wavelength of the laser beam than the lens member is formed on the fusion part provided on the holding member. Further, in a state where the lens member is held by the holding member, the lens member and the holding member are fused by irradiating the laser beam through the lens member toward the fused portion. Then, at the time of fusing, the lens member is positioned on the holding member by bringing the first positioning portion provided on the lens member into contact with the second positioning portion provided on the holding member. Note that the fused portion and the second positioning portion of the holding member are arranged at an interval in the plane direction intersecting the optical axis direction of the optical module, and the fused portion and the first positioning portion of the lens member are It arrange | positions at intervals in the plane direction. In the lens member, the thickness in the optical axis direction of the portion corresponding to the fused portion is thinner than the thickness corresponding to the first positioning portion. In a state where the lens member is held by the holding member before the fusion, the lens member and the holding member are in contact via the fusion part, and the first positioning part and the second positioning part are separated from each other. And in the case of melt | fusion, a 1st positioning part and a 2nd positioning part contact | abut by fusion | melting of a melt | fusion part.

第６の発明は、レンズ部と融着部とを有するレンズ部材を、保持部材に保持する光学モジュールの製造方法である。この発明では、レンズ部材よりもレーザー光の波長の透過率が高い材質で保持部材を形成する。また、保持部材よりもレーザー光の波長の吸収率が高い材質で融着部を形成する。さらに、レンズ部材を保持部材に保持した状態で、保持部材を介して融着部にレーザー光を照射することでレンズ部材および保持部材を融着する。そして、融着の際に、レンズ部材に設けた第１位置決め部と保持部材に設けた第２位置決め部とを当接させてレンズ部材を保持部材に位置決めする。なお、レンズ部材の融着部および第１位置決め部は、光学モジュールの光軸方向と交差する平面方向に間隔をおいて配置され、保持部材の被融着部および第２位置決め部は、上記の平面方向に間隔をおいて配置される。また、レンズ部材において、融着部に対応する部分の光軸方向の厚みが、第１位置決め部に対応する部分の厚みよりも薄い。融着前にレンズ部材を保持部材に保持した状態では、レンズ部材および保持部材が融着部を介して接触するとともに、第１位置決め部および第２位置決め部が離間している。そして、融着の際に、融着部の融解によって第１位置決め部および第２位置決め部が当接する。 6th invention is a manufacturing method of the optical module which hold | maintains the lens member which has a lens part and a melt | fusion part to a holding member. In the present invention, the holding member is formed of a material having a higher transmittance for the wavelength of the laser beam than the lens member. Further, the fused portion is formed of a material having a higher absorption rate of the laser light wavelength than the holding member. Furthermore, in a state where the lens member is held by the holding member, the lens member and the holding member are fused by irradiating the fused portion with laser light through the holding member. Then, at the time of fusing, the lens member is positioned on the holding member by bringing the first positioning portion provided on the lens member into contact with the second positioning portion provided on the holding member. The fused portion and the first positioning portion of the lens member are arranged at an interval in a plane direction intersecting the optical axis direction of the optical module, and the fused portion and the second positioning portion of the holding member are It arrange | positions at intervals in the plane direction. In the lens member, the thickness of the portion corresponding to the fused portion in the optical axis direction is smaller than the thickness of the portion corresponding to the first positioning portion. In a state where the lens member is held by the holding member before the fusion, the lens member and the holding member are in contact via the fusion part, and the first positioning part and the second positioning part are separated from each other. And in the case of melt | fusion, a 1st positioning part and a 2nd positioning part contact | abut by fusion | melting of a melt | fusion part.

第７の発明は、レンズ部と融着部とを有するレンズ部材を、保持部材に保持する光学モジュールの製造方法である。この発明では、レンズ部材よりもレーザー光の波長の透過率が高い材質で保持部材を形成する。また、レンズ部材よりもレーザー光の波長の吸収率が高い被膜を融着部に形成する。さらに、レンズ部材を保持部材に保持した状態で、保持部材を介して融着部にレーザー光を照射することでレンズ部材および保持部材を融着する。そして、融着の際に、レンズ部材に設けた第１位置決め部と保持部材に設けた第２位置決め部とを当接させてレンズ部材を保持部材に位置決めする。なお、レンズ部材の融着部および第１位置決め部は、光学モジュールの光軸方向と交差する平面方向に間隔をおいて配置され、保持部材の被融着部および第２位置決め部は、上記の平面方向に間隔をおいて配置される。また、レンズ部材において、融着部に対応する部分の光軸方向の厚みが、第１位置決め部に対応する部分の厚みよりも薄い。融着前にレンズ部材を保持部材に保持した状態では、レンズ部材および保持部材が融着部を介して接触するとともに、第１位置決め部および第２位置決め部が離間している。そして、融着の際に、融着部の融解によって第１位置決め部および第２位置決め部が当接する。 7th invention is a manufacturing method of the optical module which hold | maintains the lens member which has a lens part and a melt | fusion part to a holding member. In the present invention, the holding member is formed of a material having a higher transmittance for the wavelength of the laser beam than the lens member. In addition, a film having a higher absorption rate of the wavelength of the laser beam than the lens member is formed on the fused portion. Furthermore, in a state where the lens member is held by the holding member, the lens member and the holding member are fused by irradiating the fused portion with laser light through the holding member. Then, at the time of fusing, the lens member is positioned on the holding member by bringing the first positioning portion provided on the lens member into contact with the second positioning portion provided on the holding member. The fused portion and the first positioning portion of the lens member are arranged at an interval in a plane direction intersecting the optical axis direction of the optical module, and the fused portion and the second positioning portion of the holding member are It arrange | positions at intervals in the plane direction. In the lens member, the thickness of the portion corresponding to the fused portion in the optical axis direction is smaller than the thickness of the portion corresponding to the first positioning portion. In a state where the lens member is held by the holding member before the fusion, the lens member and the holding member are in contact via the fusion part, and the first positioning part and the second positioning part are separated from each other. And in the case of melt | fusion, a 1st positioning part and a 2nd positioning part contact | abut by fusion | melting of a melt | fusion part.

本発明の光学モジュールでは、一方の部材を透過して融着部に照射されたレーザー光によってレンズ部材と保持部材とを融着して強固に固定できる。また、融着状態の光学モジュールでは、第１位置決め部と第２位置決め部との当接によって、レンズ部の光軸方向の位置決めを高い精度で行うことができる。 In the optical module of the present invention, the lens member and the holding member can be fused and firmly fixed by the laser beam that is transmitted through one member and applied to the fused portion. In the fused optical module, the lens portion can be positioned with high accuracy by the contact between the first positioning portion and the second positioning portion.

（第１実施形態の説明）
図１から図７は本発明の光学モジュールの第１実施形態を示す図である。第１実施形態では、光学モジュールがカメラの焦点検出装置を構成する。
焦点検出装置は、レンズ保持部材１１と、入射光の赤外線成分を除去する赤外カットフィルタ１２と、絞りマスク１３と、セパレータレンズ１４と、光学センサパッケージ１５と、折り返しミラー１０とを備えている。 (Description of the first embodiment)
1 to 7 are views showing a first embodiment of the optical module of the present invention. In the first embodiment, the optical module constitutes a camera focus detection device.
The focus detection apparatus includes a lens holding member 11, an infrared cut filter 12 that removes an infrared component of incident light, an aperture mask 13, a separator lens 14, an optical sensor package 15, and a folding mirror 10. .

レンズ保持部材１１は焦点検出装置の本体部分を構成する。このレンズ保持部材１１には焦点検出装置の各構成部品が位置決めされて取り付けられる。
ここで、レンズ保持部材１１は、後述のレーザー光の波長の吸収率がセパレータレンズ１４よりも高い材質で形成されている。例えば、レンズ保持部材１１は、光吸収性の高い充填材を分散させた熱可塑性樹脂（プラスチックなど）で成形される。光吸収性の高い充填材としては、例えば、カーボンブラック等の顔料系色素やアルミ等の金属粉などが該当する。また、レーザー光の波長の光をよく吸収する波長選択性の光吸収剤を上記の充填材に用いてもよい。例えば、紫外線レーザー（波長２５０ｎｍ〜３５０ｎｍ程度）で融着を行う場合には、シアノアクリレート系紫外線吸収剤、ベンゾフェノン系紫外線吸収剤、高分子型紫外線吸収剤などを充填材に用いることができる。勿論、赤外線レーザーで融着を行う場合には、公知の赤外線吸収剤を充填材に用いてもよい。 The lens holding member 11 constitutes a main body portion of the focus detection device. Each component of the focus detection device is positioned and attached to the lens holding member 11.
Here, the lens holding member 11 is formed of a material that has a higher absorptance of the wavelength of laser light described later than that of the separator lens 14. For example, the lens holding member 11 is formed of a thermoplastic resin (such as plastic) in which a filler having a high light absorption property is dispersed. Examples of the highly light-absorbing filler include pigment dyes such as carbon black and metal powders such as aluminum. Moreover, you may use the wavelength-selective light absorber which absorbs the light of the wavelength of a laser beam for said filler. For example, when fusing with an ultraviolet laser (wavelength of about 250 nm to 350 nm), a cyanoacrylate ultraviolet absorber, a benzophenone ultraviolet absorber, a polymer ultraviolet absorber, or the like can be used as the filler. Of course, when fusing with an infrared laser, a known infrared absorber may be used as the filler.

図１においてレンズ保持部材１１の上面側（入射側）および左下側（センサ取付側）には開口部が形成され、入射側の開口部には測距光束を分離して不要な光束を除去するための視野マスク１６が取り付けられている。視野マスク１６には、被写体からの光束を通過させるために矩形状の開口１６ａが複数形成されている。
また、図２（ａ）は図１の背面側からレンズ保持部材１１を見た状態を示す図である。レンズ保持部材１１のセンサ取付部分の背面には開口部が形成されている。そして、レンズ保持部材１１の内部には、コンデンサレンズ（不図示）が入射側の上面部に組み込まれる。また、レンズ保持部材１１の背面側の開口部は、コンデンサレンズの組み付け後に折り返しミラー１０が取り付けられて塞がれる。この折り返しミラー１０は、コンデンサレンズを透過した光束を反射させてセンサ取付側の開口部１１ａに導く役目を果たす。なお、レンズ保持部材１１に折り返しミラー１０を取り付けた状態を図２（ｂ）に示す。 In FIG. 1, openings are formed on the upper surface side (incident side) and lower left side (sensor mounting side) of the lens holding member 11, and the distance measuring light beam is separated from the incident side opening portion to remove unnecessary light fluxes. A field mask 16 is attached. In the field mask 16, a plurality of rectangular openings 16a are formed in order to allow the light flux from the subject to pass therethrough.
FIG. 2A is a diagram showing a state in which the lens holding member 11 is viewed from the back side in FIG. An opening is formed on the back surface of the sensor mounting portion of the lens holding member 11. A condenser lens (not shown) is incorporated in the upper surface portion on the incident side inside the lens holding member 11. Further, the opening on the back side of the lens holding member 11 is closed by attaching the folding mirror 10 after the condenser lens is assembled. The folding mirror 10 serves to reflect the light beam transmitted through the condenser lens and guide it to the opening 11a on the sensor mounting side. FIG. 2B shows a state where the folding mirror 10 is attached to the lens holding member 11.

さらに、図３に示すようにセンサ取付側の開口部１１ａの周囲にはセパレータレンズ１４の外形に対応する凹陥部１１ｂが形成される。この凹陥部１１ｂには組み立て順に、赤外カットフィルタ１２、絞りマスク１３およびセパレータレンズ１４が配置される。そして、セパレータレンズ１４の取り付け後に、レンズ保持部材１１の凹陥部１１ｂの位置には外側から光学センサパッケージ１５が装着される。なお、レンズ保持部材１１とセパレータレンズ１４とはレーザー融着で固定される。 Further, as shown in FIG. 3, a recess 11b corresponding to the outer shape of the separator lens 14 is formed around the opening 11a on the sensor mounting side. An infrared cut filter 12, a diaphragm mask 13 and a separator lens 14 are arranged in the concave portion 11b in the order of assembly. Then, after the separator lens 14 is attached, the optical sensor package 15 is attached to the position of the recessed portion 11b of the lens holding member 11 from the outside. The lens holding member 11 and the separator lens 14 are fixed by laser fusion.

凹陥部１１ｂにおいて、図３での奥行方向の底面には、赤外カットフィルタ１２を嵌め込むための段付部１１ｃが開口部１１ａの周囲に形成されている。また、凹陥部１１ｂの底面には、セパレータレンズ１４の挿入方向に突出する一組の軸部１７，１８と、融着部１９と、位置決め基部２０とが形成されている。
一組の軸部１７，１８は開口部１１ａを隔てて左右に配置される。図中左側に位置する一方の軸部１７は円形断面であって、図中右側に位置する他方の軸部１８は軸部１７と同形状の軸本体の上下２箇所に突起部が形成されている。軸部１８の各突起部は基端側から軸方向に沿ってそれぞれ延長し、各突起部の頂面は軸部幅方向に沿った水平面をなしている。 In the recessed portion 11b, a stepped portion 11c for fitting the infrared cut filter 12 is formed around the opening portion 11a on the bottom surface in the depth direction in FIG. A pair of shaft portions 17 and 18 projecting in the insertion direction of the separator lens 14, a fused portion 19, and a positioning base portion 20 are formed on the bottom surface of the recessed portion 11 b.
The pair of shaft portions 17 and 18 are arranged on the left and right sides with the opening 11a therebetween. One shaft portion 17 located on the left side in the drawing has a circular cross section, and the other shaft portion 18 located on the right side in the drawing has protrusions formed at two upper and lower portions of the shaft body having the same shape as the shaft portion 17. Yes. Each projecting portion of the shaft portion 18 extends from the base end side along the axial direction, and the top surface of each projecting portion forms a horizontal plane along the shaft portion width direction.

融着部１９および位置決め基部２０はいずれも凹陥部１１ｂの底面に形成されている。融着部１９は各軸部１７，１８の周辺に間隔をおいて配置されている。一方、位置決め基部２０はセパレータレンズ１４の上辺部近傍に２つ、下辺部近傍に２つ配置されている。
融着部１９およびレンズ位置決め基部２０はセパレータレンズ１４の挿入方向に突出した円筒状の台座であって、その先端部は凹陥部１１ｂの底面と平行な平坦面をなしている。なお、位置決め基部２０の高さ（凹陥部底面からの突出量）は融着部１９の高さよりもわずかに低く設定されている。 The fused portion 19 and the positioning base portion 20 are both formed on the bottom surface of the recessed portion 11b. The fused portion 19 is disposed around the shaft portions 17 and 18 with a space therebetween. On the other hand, two positioning bases 20 are disposed in the vicinity of the upper side of the separator lens 14 and two in the vicinity of the lower side.
The fused portion 19 and the lens positioning base portion 20 are cylindrical pedestals that protrude in the insertion direction of the separator lens 14, and their tip portions form a flat surface parallel to the bottom surface of the recessed portion 11 b. The height of the positioning base portion 20 (the amount of protrusion from the bottom surface of the recessed portion) is set slightly lower than the height of the fused portion 19.

絞りマスク１３には、折り返しミラー１０からの光束を通過させる円形状の開口１３ａが中央部に複数形成されている。また、絞りマスク１３は融着部１９および位置決め基部２０と干渉する箇所は切り欠かれており、その両側部には軸部１７，１８との対応位置に挿通孔１３ｂがそれぞれ形成されている。焦点検出装置の組立時には各挿通孔１３ｂに軸部１７，１８がそれぞれ挿入される。 The aperture mask 13 is formed with a plurality of circular openings 13a through which the light flux from the folding mirror 10 passes. Further, the diaphragm mask 13 is notched at portions where it interferes with the fused portion 19 and the positioning base portion 20, and through holes 13b are formed at positions corresponding to the shaft portions 17 and 18 on both sides thereof. When the focus detection device is assembled, the shaft portions 17 and 18 are inserted into the respective insertion holes 13b.

セパレータレンズ１４は透光性の熱可塑性樹脂（プラスチック等）で形成され、測距光束や後述のレーザー光が透過できるようになっている。セパレータレンズ１４は、１対のレンズを複数組配置して構成されたレンズ部１４ａと、レンズ部１４ａの外周部に形成される取付部１４ｂとを有している。なお、レンズ部１４ａは絞りマスク１３を通過した測距光束をセンサ上に結像させる役目を果たす。 The separator lens 14 is made of a light-transmitting thermoplastic resin (plastic or the like), and can transmit a distance measuring light beam and a laser beam described later. The separator lens 14 has a lens portion 14a configured by arranging a plurality of pairs of lenses, and a mounting portion 14b formed on the outer peripheral portion of the lens portion 14a. The lens unit 14a serves to form an image of the distance measuring light beam that has passed through the aperture mask 13 on the sensor.

取付部１４ｂには、レンズ部１４ａを隔てて軸部１７，１８の対応位置に位置決め穴２１，２２がそれぞれ形成されている。各位置決め穴２１，２２はレンズ部１４ａの光軸方向に沿って開口されている。そして、図中左側に位置する一方の位置決め穴２１は円形に形成され、図中右側に位置する他方の位置決め穴２２はセパレータレンズ１４の幅方向に延長する長穴に形成されている。この一方の位置決め穴２１は一方の軸部１７と嵌合し、レンズ部１４ａの光軸方向に垂直な面の並進方向移動を規定する。また、他方の位置決め穴２２は突起部を有する他方の軸部１８と嵌合し、レンズ部１４ａの光軸方向に垂直な面の回転方向移動を規定する。 Positioning holes 21 and 22 are formed in the attachment portion 14b at positions corresponding to the shaft portions 17 and 18 with the lens portion 14a interposed therebetween. The positioning holes 21 and 22 are opened along the optical axis direction of the lens portion 14a. One positioning hole 21 located on the left side in the figure is formed in a circular shape, and the other positioning hole 22 located on the right side in the figure is formed as a long hole extending in the width direction of the separator lens 14. The one positioning hole 21 is fitted to the one shaft portion 17 and defines the translational movement of the surface perpendicular to the optical axis direction of the lens portion 14a. Further, the other positioning hole 22 is fitted to the other shaft portion 18 having the projection portion, and defines the rotational movement of the surface perpendicular to the optical axis direction of the lens portion 14a.

取付部１４ｂの一面には融着部１９との対応位置にレンズ側被融着部２３が形成され、位置決め基部２０の対応位置にレンズ側位置決め基部２４がそれぞれ形成されている。レンズ側被融着部２３およびレンズ側位置決め基部２４は、レンズ部１４ａの光軸方向に突出した円筒状の台座であって、その先端部はレンズ部１４ａの光軸と垂直な平坦面をなしている。また、レンズ側位置決め基部２４の高さ（取付部１４ｂの一面からの突出量）はレンズ側被融着部２３の高さよりもわずかに低く設定されている。 A lens-side fused portion 23 is formed at a position corresponding to the fused portion 19 on one surface of the mounting portion 14 b, and a lens-side positioning base portion 24 is formed at a corresponding position of the positioning base portion 20. The lens-side fused portion 23 and the lens-side positioning base portion 24 are cylindrical pedestals that protrude in the optical axis direction of the lens portion 14a, and their tip portions form a flat surface perpendicular to the optical axis of the lens portion 14a. ing. The height of the lens-side positioning base 24 (the amount of protrusion from one surface of the mounting portion 14b) is set slightly lower than the height of the lens-side fused portion 23.

また、取付部１４ｂの他面では、位置決め穴２１，２２およびレンズ側被融着部２３の裏側部分が矩形状に切り欠かれてくぼんでいる。そのため、レンズ側被融着部２３の光軸方向厚さは、レンズ側位置決め基部２４の光軸方向厚さよりも薄くなっている。
ここで、レンズ保持部材１１とセパレータレンズ１４とのレーザー融着の工程を図６および図７を参照しつつ説明する。 Further, on the other surface of the attachment portion 14b, the positioning holes 21 and 22 and the back side portions of the lens-side fused portion 23 are cut out into a rectangular shape and recessed. Therefore, the thickness in the optical axis direction of the lens side fused portion 23 is thinner than the thickness in the optical axis direction of the lens side positioning base portion 24.
Here, a laser fusion process between the lens holding member 11 and the separator lens 14 will be described with reference to FIGS.

図６はレンズ保持部材１１とセパレータレンズ１４との融着前の状態を示す縦断面図である。図６では、レンズ保持部材１１の凹陥部１１ｂに一面側を向けたセパレータレンズ１４が取り付けられており、この取付状態では融着部１９の先端とレンズ側被融着部２３の先端とが互いに接触している。一方、位置決め基部２０およびレンズ側位置決め基部２４の先端は、それぞれ間隔Ｌをおいて対向した状態となる。 FIG. 6 is a longitudinal sectional view showing a state before the lens holding member 11 and the separator lens 14 are fused. In FIG. 6, the separator lens 14 facing one surface is attached to the recessed portion 11 b of the lens holding member 11. In this attached state, the tip of the fused portion 19 and the tip of the lens side fused portion 23 are mutually connected. In contact. On the other hand, the tips of the positioning base 20 and the lens side positioning base 24 are opposed to each other with an interval L therebetween.

融着時には、セパレータレンズ１４の他面側（レンズ保持部材１１との反対側）からレンズ側被融着部２３に対してレーザー光を照射する。レーザー光はレンズ側被融着部２３を透過し、レーザー光の波長の吸収率が高くなるレンズ保持部材１１との界面部分（レンズ側被融着部２３および融着部１９の先端面）を融解する。これによりレンズ保持部材１１とセパレータレンズ１４とが融着される。ここで、融着部１９は、セパレータレンズ１４よりもレーザー光の波長の吸収率が高い材質で形成されている。したがって、融着部１９に照射されたレーザー光は効率よく熱に変換されるので、融着時のレーザー光の照射量が少なくても融着部１９は効率的に融解する。 At the time of fusion, laser light is irradiated to the lens-side fused portion 23 from the other surface side of the separator lens 14 (opposite side to the lens holding member 11). The laser light passes through the lens-side fused portion 23 and passes through the interface portion (the lens-side fused portion 23 and the front end surface of the fused portion 19) with the lens holding member 11 where the absorption rate of the wavelength of the laser light increases. Melt. Thereby, the lens holding member 11 and the separator lens 14 are fused. Here, the fused portion 19 is formed of a material having a higher absorption rate of the wavelength of the laser light than the separator lens 14. Therefore, since the laser light irradiated to the fusion part 19 is efficiently converted into heat, the fusion part 19 is efficiently melted even if the irradiation amount of the laser light at the time of fusion is small.

なお、融着時には融着部１９とレンズ側被融着部２３との接合箇所が溶解した樹脂で太径となる。しかし、第１実施形態では融着部１９およびレンズ側被融着部２３は軸部１７，１８や位置決め基部２０，２４から間隔をおいて配置されているため、融着時に部材間の干渉が生じることはない。
一方、上記の融解によってレンズ保持部材１１とセパレータレンズ１４とが間隔Ｌだけ接近し、位置決め基部２０の先端とレンズ側位置決め基部２４の先端とが互いに接触する。したがって、図７に示す融着後の状態では、位置決め基部２０およびレンズ側位置決め基部２４によってレンズ保持部材１１とセパレータレンズ１４との相対距離が規定される。 At the time of fusion, the joint portion between the fused portion 19 and the lens side fused portion 23 has a large diameter with a dissolved resin. However, in the first embodiment, the fused portion 19 and the lens-side fused portion 23 are spaced from the shaft portions 17 and 18 and the positioning base portions 20 and 24, so that interference between members occurs during fusion. It does not occur.
On the other hand, the lens holding member 11 and the separator lens 14 approach each other by the distance L due to the above melting, and the tip of the positioning base 20 and the tip of the lens side positioning base 24 come into contact with each other. Therefore, in the state after fusion shown in FIG. 7, the relative distance between the lens holding member 11 and the separator lens 14 is defined by the positioning base 20 and the lens side positioning base 24.

光学センサパッケージ１５には、セパレータレンズ１４と相対する面にラインセンサが複数組配置されている（ラインセンサの図示は省略する）。組立後の焦点検出装置では、光学センサパッケージ１５がセパレータレンズ１４で分割された２つの像を検出する。なお、この２像間の間隔に基づいて、図示しないＣＰＵが公知の演算式によるデフォーカス量（合焦位置からのズレ量）の演算を行う。 The optical sensor package 15 has a plurality of line sensors arranged on the surface facing the separator lens 14 (illustration of the line sensors is omitted). In the assembled focus detection device, the optical sensor package 15 detects two images divided by the separator lens 14. Based on the interval between the two images, a CPU (not shown) calculates a defocus amount (a shift amount from the in-focus position) using a known arithmetic expression.

以下、第１実施形態の焦点検出装置の効果を説明する。
第１実施形態では、レンズ保持部材１１とセパレータレンズ１４とがレーザー融着で強固に固定されるので、融着後においてレンズ部１４ａのがたつきによる光学性能の低下を防止できる。また、融着状態では位置決め基部２０とレンズ側位置決め基部２４とによってレンズ保持部材１１とセパレータレンズ１４との相対距離が規定されるので、レンズ部１４ｂの光軸方向の位置決めが高い精度で行われる。 Hereinafter, the effect of the focus detection apparatus of the first embodiment will be described.
In the first embodiment, since the lens holding member 11 and the separator lens 14 are firmly fixed by laser fusion, it is possible to prevent a decrease in optical performance due to rattling of the lens portion 14a after fusion. Further, since the relative distance between the lens holding member 11 and the separator lens 14 is defined by the positioning base 20 and the lens side positioning base 24 in the fused state, the positioning of the lens portion 14b in the optical axis direction is performed with high accuracy. .

第１実施形態では、融着部１９はセパレータレンズ１４よりもレーザー光の波長の吸収率が高い材質で形成されているので、融着時のレーザー光の照射量が比較的に少なくても融着部１９は効率的に融解する。すなわち、第１実施形態では融着作業でのレーザー光の照射量を抑制できるので、レンズ保持部材１１およびセパレータレンズ１４の熱変形や、レンズ保持部材１１に生じる変色を最小限に抑制できる。しかも、第１実施形態ではレンズ側被融着部２３の光軸方向厚さが薄く設定されているため、融着時のレーザー光の照射量をより一層少なくすることができる。 In the first embodiment, since the fusion part 19 is formed of a material having a higher absorption rate of the laser light wavelength than the separator lens 14, the fusion part 19 can be fused even if the amount of laser light irradiation during the fusion is relatively small. The landing part 19 is efficiently melted. That is, in the first embodiment, the laser light irradiation amount in the fusing operation can be suppressed, so that thermal deformation of the lens holding member 11 and the separator lens 14 and discoloration occurring in the lens holding member 11 can be suppressed to a minimum. In addition, in the first embodiment, since the thickness in the optical axis direction of the lens-side fused portion 23 is set to be thin, it is possible to further reduce the irradiation amount of the laser light at the time of fusion.

第１実施形態では、セパレータレンズ１４の他面側からレンズ側被融着部２３にレーザー光をピンポイントに照射して融着するので、容易に融着作業を行うことができる。また、融着作業のためにレンズ保持部材１１およびセパレータレンズ１４の形状やレイアウトに大きな制約が生じることもない。しかも、第１実施形態では固定に接着剤を用いないので、レンズ部１４ａの光学面が接着剤で汚れることもない。 In the first embodiment, since the laser beam is irradiated to the lens-side fused portion 23 from the other surface side of the separator lens 14 to the pinpoint, the fusion work can be easily performed. Further, there is no great restriction on the shape and layout of the lens holding member 11 and the separator lens 14 due to the fusion work. In addition, since no adhesive is used for fixing in the first embodiment, the optical surface of the lens portion 14a is not soiled by the adhesive.

（第２実施形態の説明）
図８は第２実施形態におけるレンズ保持部材１１とセパレータレンズ１４との融着前の状態を示す縦断面図である。なお、以下の実施形態の説明では、第１実施形態と共通の構成には同一符号を付して重複説明を省略する。
第２実施形態は第１実施形態の変形例であって、融着部１９の表面にレーザー光吸収膜２５が形成されている。このレーザー光吸収膜２５は、セパレータレンズ１４よりもレーザー光の波長の吸収率が高い特性を有している。第２実施形態では、光吸収性の高い充填材を溶媒に分散させた塗料を融着部１９に塗布することでレーザー光吸収膜２５を形成している。 (Description of Second Embodiment)
FIG. 8 is a longitudinal sectional view showing a state before the lens holding member 11 and the separator lens 14 are fused in the second embodiment. In the following description of the embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the duplicate description will be omitted.
The second embodiment is a modification of the first embodiment, and a laser light absorption film 25 is formed on the surface of the fused portion 19. The laser light absorption film 25 has a characteristic that the absorption rate of the wavelength of the laser light is higher than that of the separator lens 14. In the second embodiment, the laser light absorption film 25 is formed by applying a paint in which a filler having a high light absorption property is dispersed in a solvent to the fused portion 19.

ここで、光吸収性の高い充填材としては、例えば、カーボンブラック等の顔料系色素やアルミ等の金属粉などが該当する。また、レーザー光に対応する波長の光をよく吸収する波長選択性の光吸収剤を上記の充填材に用いてもよい。例えば、紫外線レーザー（波長２５０ｎｍ〜３５０ｎｍ程度）で融着を行う場合には、シアノアクリレート系紫外線吸収剤、ベンゾフェノン系紫外線吸収剤、高分子型紫外線吸収剤などを充填材に用いることができる。勿論、赤外線レーザーで融着を行う場合には、公知の赤外線吸収剤を充填材に用いてもよい。 Here, examples of the highly light-absorbing filler include pigment-based dyes such as carbon black and metal powders such as aluminum. Moreover, you may use the wavelength-selective light absorber which absorbs the light of the wavelength corresponding to a laser beam well for said filler. For example, when fusing with an ultraviolet laser (wavelength of about 250 nm to 350 nm), a cyanoacrylate ultraviolet absorber, a benzophenone ultraviolet absorber, a polymer ultraviolet absorber, or the like can be used as the filler. Of course, when fusing with an infrared laser, a known infrared absorber may be used as the filler.

上記の第２実施形態の構成によっても、第１実施形態とほぼ同様の効果を得ることができる。特に第２実施形態の構成によれば、レーザー光吸収膜２５によってレーザー光の吸収の効率を上げることができるので、レンズ保持部材１１の材質の選択の幅が広がって光学モジュールの設計の自由度が高くなる。
（第３実施形態の説明）
図９は第３実施形態におけるレンズ保持部材１１とセパレータレンズ１４との融着前の状態を示す縦断面図である。第３実施形態では、レンズ保持部材１１を介してセパレータレンズ１４にレーザー光を照射することでレーザー融着を行う。 According to the configuration of the second embodiment, substantially the same effect as that of the first embodiment can be obtained. In particular, according to the configuration of the second embodiment, the efficiency of laser light absorption can be increased by the laser light absorption film 25, so that the selection range of the material of the lens holding member 11 is widened and the degree of freedom in designing the optical module is increased. Becomes higher.
(Description of the third embodiment)
FIG. 9 is a longitudinal sectional view showing a state before the lens holding member 11 and the separator lens 14 are fused in the third embodiment. In the third embodiment, laser fusion is performed by irradiating the separator lens 14 with laser light through the lens holding member 11.

第３実施形態のレンズ保持部材１１は、セパレータレンズ１４の取付部１４ｂよりもレーザー光の波長の透過性の高い部材で生成されている。例えば、レンズ保持部材１１は公知のレーザー光透過性組成物で生成される。なお、レーザー光透過性組成物の一例として、特開２００５−２９０３７２号公報に開示された樹脂などが挙げられる。上記公報には、溶融温度が１６０℃〜２１０℃の未着色の動的架橋型ポリオレフィン系熱可塑性エラストマーと、８００〜１２００ｎｍのレーザー光を透過する造塩体着色剤とを混合して調製されたレーザー光透過性組成物が開示されている。勿論、第３実施形態では、紫外線を透過する特性を有する着色剤を混合したレーザー光透過性組成物を用いてもよい。 The lens holding member 11 of the third embodiment is made of a member having a higher laser wavelength transmission than the attachment portion 14b of the separator lens 14. For example, the lens holding member 11 is made of a known laser light transmitting composition. An example of the laser light transmissive composition is a resin disclosed in JP-A-2005-290372. The above publication was prepared by mixing an uncolored dynamic cross-linked polyolefin-based thermoplastic elastomer having a melting temperature of 160 ° C. to 210 ° C. and a salt-forming colorant that transmits laser light of 800 to 1200 nm. A laser light transmissive composition is disclosed. Of course, in the third embodiment, a laser light transmitting composition in which a colorant having a property of transmitting ultraviolet rays is mixed may be used.

また、第３実施形態のレンズ保持部材１１は第１実施形態と同一の形状に形成されている。なお、第３実施形態では、第１実施形態で融着部（１９）となる円筒形の台座が被融着部１９ａとして機能する。
一方、第３実施形態のセパレータレンズ１４は、レンズ保持部材１１よりもレーザー光の波長の吸収性が高い部材で生成されている。例えば、セパレータレンズ１４は、レーザー光の波長の光をよく吸収するとともに、可視光の波長を透過させる波長選択性の光吸収剤を充填材として分散した熱可塑性樹脂（プラスチックなど）で成形される。例えば、紫外線レーザー（波長２５０ｎｍ〜３５０ｎｍ）で融着を行う場合には、シアノアクリレート系紫外線吸収剤、ベンゾフェノン系紫外線吸収剤、高分子型紫外線吸収剤などを充填材に用いることができる。勿論、赤外線レーザーで融着を行う場合には、公知の赤外線吸収剤を充填材に用いてもよい。 The lens holding member 11 of the third embodiment is formed in the same shape as that of the first embodiment. In the third embodiment, a cylindrical pedestal serving as the fused portion (19) in the first embodiment functions as the fused portion 19a.
On the other hand, the separator lens 14 according to the third embodiment is formed of a member having a higher absorbability of the laser light wavelength than the lens holding member 11. For example, the separator lens 14 is molded of a thermoplastic resin (plastic or the like) in which a wavelength-selective light absorber that absorbs light of the wavelength of laser light and transmits the wavelength of visible light is dispersed as a filler. . For example, when fusing with an ultraviolet laser (wavelength: 250 nm to 350 nm), a cyanoacrylate ultraviolet absorber, a benzophenone ultraviolet absorber, a polymer ultraviolet absorber, or the like can be used as the filler. Of course, when fusing with an infrared laser, a known infrared absorber may be used as the filler.

また、第３実施形態のセパレータレンズ１４は第１実施形態と同一の形状に形成されている。なお、第３実施形態では、第１実施形態でレンズ側被融着部（２３）となる円筒形の台座がレンズ側融着部２３ａとして機能する。
ここで、第３実施形態での光学モジュールの組み立て工程を簡単に説明する。第３実施形態では、レンズ保持部材１１に折り返しミラー１０を取り付ける前に、赤外カットフィルタ１２、絞りマスク１３およびセパレータレンズ１４をレンズ保持部材１１に取り付ける。 The separator lens 14 of the third embodiment is formed in the same shape as that of the first embodiment. In the third embodiment, the cylindrical pedestal serving as the lens-side fused portion (23) in the first embodiment functions as the lens-side fused portion 23a.
Here, the assembly process of the optical module in the third embodiment will be briefly described. In the third embodiment, before attaching the folding mirror 10 to the lens holding member 11, the infrared cut filter 12, the aperture mask 13 and the separator lens 14 are attached to the lens holding member 11.

そして、レンズ保持部材１１の背面側の開口からセパレータレンズ１４へレーザー光を照射する。このとき、レーザー光はレンズ保持部材１１を透過するとともに、レーザー光の吸収効率の高いセパレータレンズ１４のレンズ側融着部２３ａを溶解させる。これにより、これによりレンズ保持部材１１とセパレータレンズ１４とが融着される。また、第３実施形態においても、融着後には位置決め基部２０の先端とレンズ側位置決め基部２４の先端とが互いに接触する。そのため、位置決め基部２０およびレンズ側位置決め基部２４によってレンズ保持部材１１とセパレータレンズ１４との相対距離が規定される。 Then, the separator lens 14 is irradiated with laser light from the opening on the back side of the lens holding member 11. At this time, the laser light passes through the lens holding member 11 and melts the lens-side fused portion 23a of the separator lens 14 having high laser light absorption efficiency. Thereby, the lens holding member 11 and the separator lens 14 are fused. Also in the third embodiment, the tip of the positioning base 20 and the tip of the lens side positioning base 24 come into contact with each other after the fusion. Therefore, the relative distance between the lens holding member 11 and the separator lens 14 is defined by the positioning base 20 and the lens side positioning base 24.

その後、コンデンサレンズを内部に組み込んだ状態でレンズ保持部材１１に折り返しミラー１０を取り付け、光学センサパッケージ１５を取り付けて光学モジュールが完成する。上記の第３実施形態の構成によっても、第１実施形態とほぼ同様の効果を得ることができる。
（第４実施形態の説明）
図１０は第４実施形態におけるレンズ保持部材１１とセパレータレンズ１４との融着前の状態を示す縦断面図である。第４実施形態は第３実施形態の変形例であって、レンズ側融着部２３ａの表面にレーザー光吸収膜２５が形成されている。このレーザー光吸収膜２５は、レンズ保持部材１１よりもレーザー光の波長の吸収率が高い特性を有している。なお、レーザー光吸収膜２５の構成は第２実施形態と共通するので重複説明は省略する。 Thereafter, the folding mirror 10 is attached to the lens holding member 11 with the condenser lens incorporated therein, and the optical sensor package 15 is attached to complete the optical module. According to the configuration of the third embodiment, substantially the same effect as that of the first embodiment can be obtained.
(Explanation of Fourth Embodiment)
FIG. 10 is a longitudinal sectional view showing a state before the lens holding member 11 and the separator lens 14 are fused in the fourth embodiment. The fourth embodiment is a modification of the third embodiment, and a laser light absorption film 25 is formed on the surface of the lens-side fused portion 23a. The laser light absorption film 25 has a characteristic that the absorption rate of the wavelength of the laser light is higher than that of the lens holding member 11. Since the configuration of the laser light absorption film 25 is the same as that of the second embodiment, a duplicate description is omitted.

上記の第４実施形態の構成によっても、第３実施形態とほぼ同様の効果を得ることができる。特に第４実施形態の構成によれば、レーザー光吸収膜２５によってレーザー光の吸収の効率を上げることができるので、セパレータレンズ１４の材質の選択の幅が広がって光学モジュールの設計の自由度が高くなる。
（実施形態の補足事項）
（１）本発明の光学モジュールは焦点検出装置のセパレータレンズとレンズ保持部材との位置決めに限定されることなく、一般的な光学部材の位置決め固定の場合に広く適用することができる。 According to the configuration of the fourth embodiment, substantially the same effect as that of the third embodiment can be obtained. In particular, according to the configuration of the fourth embodiment, the efficiency of laser light absorption can be increased by the laser light absorption film 25, so that the selection range of the material of the separator lens 14 is widened and the degree of freedom in designing the optical module is increased. Get higher.
(Supplementary items of the embodiment)
(1) The optical module of the present invention is not limited to the positioning of the separator lens and the lens holding member of the focus detection device, but can be widely applied to the case of positioning and fixing a general optical member.

（２）上記実施形態において、融着の際にレーザー光を照射する部材に凸レンズ、プリズム、フレネルレンズなどの集光光学素子を形成しておいてもよい。この場合には、融着する部分にレーザー光が収束するため、レーザー光の照射量をより一層抑制することができる。
（３）上記実施形態において、レンズ部１４ａの光学面とレンズ側被融着部２３の平坦面およびその裏面とを除き、セパレータレンズ１４の表面に研磨やブラスト処理等による粗面化処理や塗装などの着色処理を施すようにしてもよい。この場合には、セパレータレンズ１４の粗面部分では乱反射や迷光の発生を抑制することができる。 (2) In the above embodiment, a condensing optical element such as a convex lens, a prism, or a Fresnel lens may be formed on a member that irradiates a laser beam at the time of fusion. In this case, since the laser beam converges on the fused portion, the amount of laser beam irradiation can be further suppressed.
(3) In the above embodiment, except for the optical surface of the lens portion 14a and the flat surface of the lens-side fused portion 23 and the back surface thereof, the surface of the separator lens 14 is roughened or painted by polishing or blasting. A coloring process such as the above may be performed. In this case, it is possible to suppress the occurrence of irregular reflection and stray light on the rough surface portion of the separator lens 14.

光学モジュールの１実施形態を示す分解斜視図An exploded perspective view showing one embodiment of an optical module （ａ）図１の背面側からレンズ保持部材を見た状態を示す図、（ｂ）レンズ保持部材に折り返しミラーを取り付けた状態を示す図(A) The figure which shows the state which looked at the lens holding member from the back side of FIG. 1, (b) The figure which shows the state which attached the folding mirror to the lens holding member レンズ保持部材におけるセンサ取付側の開口部付近の拡大図Enlarged view of the vicinity of the opening on the sensor mounting side of the lens holding member 第１実施形態におけるセパレータレンズの取付状態を示す正面図The front view which shows the attachment state of the separator lens in 1st Embodiment 図４のＡ−Ａ断面図AA sectional view of FIG. 第１実施形態におけるレンズ保持部材とセパレータレンズとの融着前の状態を示す縦断面図The longitudinal cross-sectional view which shows the state before melt | fusion of the lens holding member and separator lens in 1st Embodiment レンズ保持部材とセパレータレンズとの融着状態を示す縦断面図A longitudinal sectional view showing a fused state between the lens holding member and the separator lens 第２実施形態におけるレンズ保持部材とセパレータレンズとの融着前の状態を示す縦断面図The longitudinal cross-sectional view which shows the state before melt | fusion of the lens holding member and separator lens in 2nd Embodiment 第３実施形態におけるレンズ保持部材とセパレータレンズとの融着前の状態を示す縦断面図The longitudinal cross-sectional view which shows the state before melt | fusion of the lens holding member and separator lens in 3rd Embodiment 第４実施形態におけるレンズ保持部材とセパレータレンズとの融着前の状態を示す縦断面図The longitudinal cross-sectional view which shows the state before melt | fusion of the lens holding member and separator lens in 4th Embodiment

Explanation of symbols

１１…レンズ保持部材、１４…セパレータレンズ、１４ａ…レンズ部、１４ｂ…取付部、１９…融着部、１９ａ…被融着部、２０…位置決め基部、２３…レンズ側被融着部、２３ａ…レンズ側融着部、２４…レンズ側位置決め基部、２５…レーザー光吸収膜

DESCRIPTION OF SYMBOLS 11 ... Lens holding member, 14 ... Separator lens, 14a ... Lens part, 14b ... Mounting part, 19 ... Fusion part, 19a ... Fused part, 20 ... Positioning base part, 23 ... Lens side fused part, 23a ... Lens side fusion part, 24 ... Lens side positioning base part, 25 ... Laser light absorption film

Claims

An optical module having a lens member having a lens portion and an attachment portion, and a holding member for holding the lens member at the attachment portion,
The mounting portion includes a fused portion that transmits the irradiated laser light, and a first positioning portion that serves as a positioning reference in the optical axis direction of the lens portion,
The fused portion and the first positioning portion are arranged at an interval in a plane direction intersecting the optical axis direction,
The holding member is made of a material having a higher absorption rate of the wavelength of the laser light than the attachment portion, and is disposed opposite the fusion-bonded portion, and is arranged with the fusion-bonded portion by the laser light. A fusion part to be fused, and a second positioning part for positioning the lens member in contact with the first positioning part in the fused state,
The fusion part and the second positioning part are arranged at an interval in the planar direction ,
In the lens member, an optical module in which the thickness in the optical axis direction of the portion corresponding to the fused portion is thinner than the thickness in the optical axis direction of the portion corresponding to the first positioning portion .

An optical module having a lens member having a lens portion and an attachment portion, and a holding member for holding the lens member at the attachment portion,
The holding member is made of a material having a higher transmittance of the wavelength of the laser beam than the mounting portion, and is a fused portion and a second positioning portion serving as a positioning reference in the optical axis direction of the lens portion And having
The fused part and the second positioning part are arranged at an interval in a plane direction intersecting the optical axis direction,
The attachment portion is disposed opposite to the fusion-bonded portion, and is in contact with the second positioning portion in the fused state, and a fusion portion that is fused to the fusion-bonded portion by the laser beam. A first positioning portion for positioning the lens member;
The fused portion and the first positioning portion are arranged at an interval in the planar direction ,
In the lens member, an optical module having a thickness corresponding to the fused portion in the optical axis direction is thinner than a thickness corresponding to the first positioning portion in the optical axis direction .

The optical module according to claim 2, wherein
The optical module, wherein the attachment portion is formed of a material having a higher absorption rate of the wavelength of the laser beam than the holding member.

A method of manufacturing an optical module for holding a lens member having a lens portion on a holding member,
Forming the holding member with a material having a higher absorption rate of the wavelength of the laser beam than the lens member;
In a state where the lens member is held by the holding member, the lens member and the holding member are fused by irradiating the laser beam through the lens member toward a fusion portion provided in the holding member. ,
During the fusion, the first positioning portion provided on the lens member and the second positioning portion provided on the holding member are brought into contact with each other to position the lens member on the holding member,
The fused portion and the second positioning portion of the holding member are arranged at an interval in a plane direction intersecting the optical axis direction of the optical module, and the fused portion of the lens member and the first positioning portion Are arranged at intervals in the planar direction ,
In the lens member, the thickness in the optical axis direction of the portion corresponding to the fused portion is thinner than the thickness in the optical axis direction of the portion corresponding to the first positioning portion,
In a state where the lens member is held by the holding member before the fusion, the lens member and the holding member are in contact with each other through the fusion part, and the first positioning part and the second positioning part are separated from each other. And
The method of manufacturing an optical module, wherein the first positioning portion and the second positioning portion are brought into contact with each other by melting the fusion portion during the fusion .

A method of manufacturing an optical module for holding a lens member having a lens portion on a holding member,
A film having a higher absorption rate of laser light than the lens member is formed on the fusion part provided on the holding member,
In the state where the lens member is held by the holding member, the lens member and the holding member are fused by irradiating the laser beam through the lens member toward the fusion part,
During the fusion, the first positioning portion provided on the lens member and the second positioning portion provided on the holding member are brought into contact with each other to position the lens member on the holding member,
The fused portion and the second positioning portion of the holding member are arranged at an interval in a plane direction intersecting the optical axis direction of the optical module, and the fused portion of the lens member and the first positioning portion Are arranged at intervals in the planar direction ,
In the lens member, the thickness in the optical axis direction of the portion corresponding to the fused portion is thinner than the thickness corresponding to the first positioning portion,
In a state where the lens member is held by the holding member before the fusion, the lens member and the holding member are in contact with each other through the fusion part, and the first positioning part and the second positioning part are separated from each other. And
The method of manufacturing an optical module, wherein the first positioning portion and the second positioning portion are brought into contact with each other by melting the fusion portion during the fusion .

A method of manufacturing an optical module for holding a lens member having a lens part and a fused part on a holding member,
Forming the holding member with a material having a higher transmittance of the wavelength of the laser beam than the lens member;
Forming the fused portion with a material having a higher absorption rate of the wavelength of the laser beam than the holding member;
In the state where the lens member is held by the holding member, the lens member and the holding member are fused by irradiating the laser beam to the fusion part through the holding member,
During the fusion, the first positioning portion provided on the lens member and the second positioning portion provided on the holding member are brought into contact with each other to position the lens member on the holding member,
The fused portion and the first positioning portion of the lens member are arranged at an interval in a plane direction intersecting the optical axis direction of the optical module, and the fused portion and the second positioning portion of the holding member Are arranged at intervals in the planar direction ,
In the lens member, the thickness in the optical axis direction of the portion corresponding to the fused portion is thinner than the thickness of the portion corresponding to the first positioning portion,
In a state where the lens member is held by the holding member before the fusion, the lens member and the holding member are in contact with each other through the fusion part, and the first positioning part and the second positioning part are separated from each other. And
The method of manufacturing an optical module, wherein the first positioning portion and the second positioning portion are brought into contact with each other by melting the fusion portion during the fusion .

A method of manufacturing an optical module for holding a lens member having a lens part and a fused part on a holding member,
Forming the holding member with a material having a higher transmittance of the wavelength of the laser beam than the lens member;
A film having a higher absorption rate of laser light than the lens member is formed on the fusion part,
In the state where the lens member is held by the holding member, the lens member and the holding member are fused by irradiating the laser beam to the fusion part through the holding member,
During the fusion, the first positioning portion provided on the lens member and the second positioning portion provided on the holding member are brought into contact with each other to position the lens member on the holding member,
The fused portion and the first positioning portion of the lens member are arranged at an interval in a plane direction intersecting the optical axis direction of the optical module, and the fused portion and the second positioning portion of the holding member Are arranged at intervals in the planar direction ,
In the lens member, the thickness in the optical axis direction of the portion corresponding to the fused portion is thinner than the thickness of the portion corresponding to the first positioning portion,
In a state where the lens member is held by the holding member before the fusion, the lens member and the holding member are in contact with each other through the fusion part, and the first positioning part and the second positioning part are separated from each other. And
The method of manufacturing an optical module, wherein the first positioning portion and the second positioning portion are brought into contact with each other by melting the fusion portion during the fusion .