JP2012123320A

JP2012123320A - Lens adjustment mechanism

Info

Publication number: JP2012123320A
Application number: JP2010275971A
Authority: JP
Inventors: Toshiji Suzuki; 利治鈴木
Original assignee: Hoya Corp
Current assignee: Hoya Corp
Priority date: 2010-12-10
Filing date: 2010-12-10
Publication date: 2012-06-28

Abstract

PROBLEM TO BE SOLVED: To provide a lens adjustment mechanism capable of performing adjustment of an optical axis position of a lens simply and reliably.SOLUTION: In a lens adjustment mechanism in which a lens holding frame for holding a lens fixedly is supported with its position adjustable in an optical axis direction with respect to a support cylinder, provided between the lens holding frame and the support cylinder are: a selection adjustment unit that includes a plurality of positioning surfaces with different circumferential positions and different surface positions in the optical axis direction, and contact portions capable of being selectively brought in contact with the plurality of positioning surfaces, and determines a position in the optical axis direction of the lens holding frame with respect to the support cylinder by contact of the positioning surfaces and the contact portions; and a selection fit index unit that includes a plurality of index concave portions with circumferential intervals and corresponding to the plurality of positioning surfaces, and index convex portions capable of selectively fitting with the plurality of index concave portions, and determines the positioning surfaces to be contact objects of the contact portions by selection fitting of the index convex portions with the index concave portions.

Description

本発明は、レンズの光軸方向位置を調整する機構に関する。 The present invention relates to a mechanism for adjusting the position of a lens in the optical axis direction.

カメラなどの撮像装置で光学系を構成するレンズ（群）の光軸方向位置を調整可能な調整機構として、ねじ機構を用いたものが知られている。ねじ機構は、無段階の調整が可能である反面、調整の手間がかかるという問題がある。特許文献１では、光軸方向位置を異ならせた段差状をなす複数の調整面を支持筒に形成し、これらの調整面に対して択一的に当接する当接面をレンズ保持枠に設け、支持筒に対するレンズ保持枠の回転方向位置を変えることによって、当接面の当接対象となる調整面を変化させてレンズ保持枠の光軸方向位置を調整させている。調整面を段階的に形成することで、調整量の選択、設定が容易になっている。 As an adjustment mechanism capable of adjusting the position in the optical axis direction of a lens (group) constituting an optical system with an imaging device such as a camera, a mechanism using a screw mechanism is known. The screw mechanism can be adjusted steplessly, but has a problem of requiring adjustment. In Patent Document 1, a plurality of adjustment surfaces having a step shape with different positions in the optical axis direction are formed on the support cylinder, and contact surfaces that selectively contact these adjustment surfaces are provided on the lens holding frame. By changing the rotation direction position of the lens holding frame with respect to the support cylinder, the adjustment surface to be abutted on the abutting surface is changed to adjust the position in the optical axis direction of the lens holding frame. By forming the adjustment surface step by step, the adjustment amount can be easily selected and set.

特開２００５−４９５９９号公報JP-A-2005-49599

特許文献１のようなレンズ調整機構で実際に調整作業を行う場合、作業性の観点から、当接面の当接対象としていずれの調整面を選択しているかを容易に認識できることが望ましい。また、ねじ機構は、螺合させることで光軸方向のみならず光軸直交方向の位置も定めて保持する作用があるのに対し、特許文献１のレンズ調整機構における当接面と調整面の当接関係は、光軸直交方向の位置を定めるものでなく、支持筒に対するレンズ保持枠の保持を別途考慮する必要がある。本発明は、これらの問題を解決し、簡単かつ確実にレンズの光軸位置調整を行うことが可能なレンズ調整機構を提供することを目的とする。 When the adjustment work is actually performed with a lens adjustment mechanism such as that disclosed in Patent Document 1, it is desirable that it is possible to easily recognize which adjustment surface is selected as the contact target of the contact surface from the viewpoint of workability. Further, the screw mechanism has an effect of determining and holding not only the optical axis direction but also the position orthogonal to the optical axis direction by screwing, whereas the contact surface and the adjustment surface of the lens adjustment mechanism of Patent Document 1 are The contact relationship does not determine the position in the direction perpendicular to the optical axis, and it is necessary to consider separately the holding of the lens holding frame with respect to the support cylinder. It is an object of the present invention to provide a lens adjustment mechanism that can solve these problems and can easily and reliably adjust the optical axis position of a lens.

本発明は、レンズを固定的に保持するレンズ保持枠を、支持筒に対して光軸方向に位置調整可能に支持させるレンズ調整機構において、レンズ保持枠と支持筒の間に、光軸を中心とする周方向位置及び光軸方向の面位置を互いに異ならせた複数の位置決め面と、該複数の位置決め面に選択的に当接可能な当接部とからなり、該当接によって支持筒に対するレンズ保持枠の光軸方向位置を決める選択調整部；及び、複数の位置決め面に対応する周方向間隔の複数の指標凹部と、該複数の指標凹部に選択的に嵌合可能な指標凸部とからなり、該選択嵌合によって当接部が当接する位置決め面を決める選択嵌合指標部；を備えたことを特徴としている。 The present invention relates to a lens adjustment mechanism that supports a lens holding frame that holds a lens fixedly with respect to a support cylinder so that the position of the lens holding frame can be adjusted in the optical axis direction, and the optical axis is centered between the lens holding frame and the support cylinder. A plurality of positioning surfaces with different circumferential positions and optical axis surface positions, and a contact portion that can selectively contact with the plurality of positioning surfaces. A selection adjusting unit that determines the position of the holding frame in the optical axis direction; a plurality of index recesses at circumferential intervals corresponding to the plurality of positioning surfaces; and an index projection that can be selectively fitted into the plurality of index recesses And a selective fitting index portion for determining a positioning surface with which the abutting portion abuts by the selective fitting.

選択調整部と選択嵌合指標部の構成要素のいずれをレンズ保持枠と支持筒に設けるかは任意に設定可能であるが、例えば、レンズ保持枠と支持筒の一方に複数の位置決め面と複数の指標凹部を設け、他方に当接部と指標凸部を設けるとよい。 It is possible to arbitrarily set which of the components of the selection adjustment unit and the selection fitting indicator unit is provided in the lens holding frame and the supporting cylinder. For example, a plurality of positioning surfaces and a plurality of positioning elements are provided on one of the lens holding frame and the supporting cylinder. It is preferable to provide an index concave portion and a contact portion and an index convex portion on the other side.

支持筒の内側に光軸方向へ厚みを有する内径フランジを設け、レンズ保持枠に外径方向に突出する外径フランジを設け、この内径フランジと外径フランジの対向部分に、レンズ調整機構を構成する以上の要素を形成することが好ましい。具体的には、支持筒の内径フランジの内縁に臨む凹部として複数の指標凹部を形成し、内径フランジ上の凹部の底面として複数の位置決め面を形成する一方、レンズ保持枠の外径フランジの外周面から外径方向に突出する凸部として指標凸部を形成し、外径フランジにおける内径フランジとの対向面から光軸方向に突出する凸部として当接部を形成するとよい。 An inner diameter flange having a thickness in the optical axis direction is provided on the inner side of the support tube, and an outer diameter flange that protrudes in the outer diameter direction is provided on the lens holding frame. It is preferable to form more elements. Specifically, a plurality of index recesses are formed as recesses facing the inner edge of the inner diameter flange of the support cylinder, and a plurality of positioning surfaces are formed as the bottom surfaces of the recesses on the inner diameter flange, while the outer periphery of the outer diameter flange of the lens holding frame The index convex portion may be formed as a convex portion protruding in the outer diameter direction from the surface, and the contact portion may be formed as a convex portion protruding in the optical axis direction from the surface of the outer diameter flange facing the inner diameter flange.

レンズ保持枠の外径フランジと支持筒の内径フランジにはさらに、互いを接着固定するための接着固定部を設けることが好ましい。接着固定部は、支持筒の内径フランジの内縁に臨む凹部として形成された接着剤注入凹部と、レンズ保持枠の外径フランジの一部をなしその外周面上に凹凸形状を有する接着片部とで構成され、選択嵌合指標部の嵌合状態で接着片部が接着剤注入凹部に進入する。接着剤注入凹部と接着片部の間には、複数の位置決め面のいずれに対して当接部が当接する状態でも、接着剤を注入可能な隙間が形成される。 It is preferable to further provide an adhesive fixing part for bonding and fixing each other to the outer diameter flange of the lens holding frame and the inner diameter flange of the support cylinder. The adhesive fixing part includes an adhesive injection concave part formed as a concave part facing the inner edge of the inner diameter flange of the support cylinder, and an adhesive piece part which forms a part of the outer diameter flange of the lens holding frame and has an uneven shape on the outer peripheral surface thereof. The adhesive piece portion enters the adhesive injection recess in the fitted state of the selective fitting indicator portion. A gap capable of injecting the adhesive is formed between the adhesive injection concave portion and the adhesive piece portion even when the contact portion is in contact with any of the plurality of positioning surfaces.

複数の位置決め面と複数の指標凹部と接着剤注入凹部を構成する内径フランジ上の凹部は、互いに連通していることが好ましい。 The plurality of positioning surfaces, the plurality of index recesses, and the recesses on the inner diameter flange constituting the adhesive injection recess are preferably communicated with each other.

選択調整部と選択嵌合指標部と接着固定部は、光軸を中心とする略同一円周上に配置されることが好ましい。 It is preferable that the selection adjustment unit, the selection fitting indicator unit, and the adhesive fixing unit are arranged on substantially the same circumference with the optical axis as the center.

さらに、支持筒の内径フランジ上で複数の指標凹部に隣接する位置に、指標凹部ごとに異なる形状の選択識別マークを形成することで、調整作業時の識別性が向上する。 Furthermore, by forming selective identification marks having different shapes for each of the index recesses at positions adjacent to the plurality of index recesses on the inner diameter flange of the support cylinder, the distinguishability during the adjustment operation is improved.

支持筒とレンズ保持枠には、レンズ調整機構を構成する要素を複数設けることが好ましい。具体的には、選択調整部と選択嵌合指標部をそれぞれ周方向に略等間隔で３セット（３箇所ずつ）設けることで、支持筒に対してレンズ保持枠を安定して支持させることができる。また、支持筒に対するレンズ保持枠の組付位置が、ひとつの光軸方向位置ごとに３つの中から選択可能になるため、部品の製造誤差などに対する許容度が高くなる。 The support cylinder and the lens holding frame are preferably provided with a plurality of elements constituting the lens adjustment mechanism. Specifically, the lens holding frame can be stably supported with respect to the support cylinder by providing three sets (three locations) of the selection adjustment portion and the selection fitting indicator portion at substantially equal intervals in the circumferential direction. it can. Further, the assembly position of the lens holding frame with respect to the support cylinder can be selected from among three positions for each position in the optical axis direction, so that the tolerance for manufacturing errors of components is increased.

以上の本発明によれば、支持筒とレンズ保持枠に、互いの光軸方向位置を決める選択調整部に加えて、この選択調整部を構成する複数の位置決め面と当接面に対応する位置関係にあって選択的に嵌合される複数の指標凹部と指標凸部からなる選択嵌合指標部を備えたため、どの光軸方向位置を選択しているかを容易に認識することができる。また、光軸方向の位置決めに際して指標凹部と指標凸部が嵌合するため、支持筒とレンズ保持枠の間で、相対回転や相対回転以外の光軸直交方向の相対移動が規制され、光軸直交面内での支持筒とレンズ保持枠の相対位置も安定する。したがって、レンズの位置調整を従来よりも簡単かつ確実に行うことができる。 According to the present invention described above, in addition to the selection adjustment unit that determines the position in the optical axis direction of the support cylinder and the lens holding frame, the positions corresponding to the plurality of positioning surfaces and the contact surface that constitute the selection adjustment unit Since there is a selective fitting index portion comprising a plurality of index concave portions and index convex portions that are selectively fitted in relation, it is possible to easily recognize which optical axis direction position is selected. In addition, since the index concave portion and the index convex portion are fitted when positioning in the optical axis direction, relative movement in the direction orthogonal to the optical axis other than relative rotation and relative rotation is restricted between the support cylinder and the lens holding frame. The relative position of the support cylinder and the lens holding frame in the orthogonal plane is also stable. Therefore, the lens position can be adjusted more easily and reliably than in the past.

本発明を適用したレンズ調整機構を備えたレンズ保持構造の分解斜視図である。It is a disassembled perspective view of the lens holding structure provided with the lens adjustment mechanism to which this invention is applied. 同レンズ保持構造の組立状態の側断面図である。It is a sectional side view of the assembly state of the lens holding structure. レンズ保持枠を光軸方向前方から見た図である。It is the figure which looked at the lens holding frame from the optical axis direction front. レンズ保持枠を光軸方向後方から見た図である。It is the figure which looked at the lens holding frame from the optical axis direction back. 支持筒を光軸方向前方から見た図である。It is the figure which looked at the support cylinder from the optical axis direction front. 選択指標部の第２指標凹部に対して指標凸部を嵌合させてレンズ保持枠を組み付けた状態の支持筒を光軸方向前方から見た図である。It is the figure which looked at the support cylinder of the state which fitted the index convex part with the 2nd index recessed part of the selection index part, and assembled | attached the lens holding frame from the optical axis direction front. 図６の組付状態におけるレンズ保持枠の位置決め凸部と支持筒の位置調整段部の関係を示す、光軸直交方向の断面図である。It is sectional drawing of an optical axis orthogonal direction which shows the relationship between the positioning convex part of the lens holding frame in the attachment state of FIG. 6, and the position adjustment step part of a support cylinder.

図１及び図２に示すように、本実施形態のレンズ保持構造は、第１レンズＬ１と第２レンズＬ２で構成されるレンズ群ＬＧをレンズ保持枠１０に固定的に支持させ、このレンズ保持枠１０を支持筒２０に組み付けた構造となっている。第１レンズＬ１と第２レンズＬ２の間にはスペーサー１１が挟まれる。支持筒２０は、多段繰出式のレンズ鏡筒の一部をなす外観筒を構成しており、レンズ群ＬＧは、レンズ鏡筒における撮像光学系の構成レンズ群のうち最も前方（被写体側）のレンズ群である。以下の説明における周方向とは、レンズ群ＬＧの光軸Ｏを中心とするものである。 As shown in FIGS. 1 and 2, the lens holding structure of the present embodiment has a lens group LG composed of a first lens L1 and a second lens L2 fixedly supported on a lens holding frame 10 and this lens holding. The frame 10 is assembled to the support cylinder 20. A spacer 11 is sandwiched between the first lens L1 and the second lens L2. The support cylinder 20 constitutes an external appearance cylinder that forms part of a multistage lens barrel, and the lens group LG is the frontmost (subject side) of the lens groups of the imaging optical system in the lens barrel. It is a lens group. In the following description, the circumferential direction is centered on the optical axis O of the lens group LG.

レンズ保持枠１０は、レンズ群ＬＧの光軸Ｏを略中心とする環状をなし第１レンズＬ１と第２レンズＬ２を外囲する保持環部１２を有し、この保持環部１２の前端部付近に、外径方向へ突出する外径フランジ１３が形成されている。外径フランジ１３は、光軸方向に所定の肉厚を有する環状枠部であり、光軸Ｏに対して略直交する前面１４及び後面１５と、前面１４と後面１５の外縁部を接続し光軸Ｏを略中心とする円筒状をなす外周面１６を有している。 The lens holding frame 10 has a holding ring portion 12 that has an annular shape that is substantially centered on the optical axis O of the lens group LG and surrounds the first lens L1 and the second lens L2, and the front end portion of the holding ring portion 12 An outer diameter flange 13 protruding in the outer diameter direction is formed in the vicinity. The outer diameter flange 13 is an annular frame portion having a predetermined thickness in the optical axis direction, and connects the front surface 14 and the rear surface 15 that are substantially orthogonal to the optical axis O, and the outer edge portions of the front surface 14 and the rear surface 15. It has a cylindrical outer peripheral surface 16 with the axis O as the center.

外径フランジ１３の外周面１６上には、該外周面１６からさらに外径方向へ突出する指標凸部（選択嵌合指標部）１７が、周方向に略等間隔で３つ設けられている。３つの指標凸部１７の形状及び大きさは共通しており、個々の指標凸部１７は径方向の突出端部が半円状に形成されている。図３に示すように、３つの指標凸部１７のうち一つは、光軸方向前方に向く面（外径フランジ１３の前面１４に続く面）に、位相識別マーク１７ａを有している。 On the outer peripheral surface 16 of the outer diameter flange 13, three index convex portions (selective fitting index portions) 17 protruding further in the outer diameter direction from the outer peripheral surface 16 are provided at substantially equal intervals in the circumferential direction. . The three index projections 17 have the same shape and size, and each index projection 17 has a semicircular protruding end in the radial direction. As shown in FIG. 3, one of the three index convex portions 17 has a phase identification mark 17 a on the surface facing forward in the optical axis direction (the surface following the front surface 14 of the outer diameter flange 13).

外径フランジ１３の外周面１６上には、３つの指標凸部１７と周方向位置を異ならせて、接着片部（接着固定部）１８が３箇所形成されている。それぞれの接着片部１８は外径フランジ１３の一部として構成されており、この接着片部１８では、外径フランジ１３の外周面１６上に５つの円弧状断面凹部とその間の山部（凸部）からなる凹凸形状が形成されている。 On the outer peripheral surface 16 of the outer diameter flange 13, three adhesive piece portions (adhesive fixing portions) 18 are formed at different positions from the three index convex portions 17 in the circumferential direction. Each of the adhesive piece portions 18 is configured as a part of the outer diameter flange 13, and in this adhesive piece portion 18, five arc-shaped cross-sectional concave portions and a peak portion (convex portion) therebetween are formed on the outer peripheral surface 16 of the outer diameter flange 13. The concave-convex shape is formed.

図４に示すように、外径フランジ１３の後面１５には、指標凸部１７及び接着片部１８と異なる周方向位置に、光軸方向後方に突出する３つの位置決め凸部（選択調整部、当接部）１９が設けられている。図７に示すように、個々の位置決め凸部１９は部分球形状に形成されており、外径フランジ１３の後面１５からの光軸方向後方への突出量は、３つの位置決め凸部１９の全てで共通している。 As shown in FIG. 4, on the rear surface 15 of the outer diameter flange 13, three positioning convex portions (selection adjusting portion, projecting rearward in the optical axis direction) at different circumferential positions from the index convex portion 17 and the adhesive piece portion 18. (Contact portion) 19 is provided. As shown in FIG. 7, each positioning projection 19 is formed in a partial spherical shape, and the amount of protrusion from the rear surface 15 of the outer diameter flange 13 to the rear in the optical axis direction is all of the three positioning projections 19. In common.

以上のように、レンズ保持枠１０の外径フランジ１３には、指標凸部１７、接着片部１８及び位置決め凸部１９がそれぞれ３つ（３セット）形成されている。３つの指標凸部１７、３箇所の接着片部１８、３つの位置決め凸部１９は、いずれも周方向へ略等間隔（１２０°等配）で設けられている。さらに、図４から分かるように、個々の指標凸部１７、接着片部１８、位置決め凸部１９の周方向位置も互いに相違しており、レンズ保持枠１０（外径フランジ１３）における特定の周方向位置には、指標凸部１７、接着片部１８及び位置決め凸部１９のいずれか一つのみが存在する。 As described above, on the outer diameter flange 13 of the lens holding frame 10, three (three sets) of the index convex portion 17, the adhesive piece portion 18, and the positioning convex portion 19 are formed. The three index convex portions 17, the three adhesive piece portions 18, and the three positioning convex portions 19 are all provided at substantially equal intervals (120 ° equidistant) in the circumferential direction. Further, as can be seen from FIG. 4, the circumferential positions of the individual index convex portions 17, the adhesive piece portions 18, and the positioning convex portions 19 are also different from each other, and a specific circumference in the lens holding frame 10 (outer diameter flange 13). Only one of the index convex portion 17, the adhesive piece portion 18, and the positioning convex portion 19 exists in the direction position.

レンズ保持枠１０が組み付けられる支持筒２０は、光軸Ｏを中心とする筒状部２１の内側に、内径方向に突出する内径フランジ２２を有する。内径フランジ２２は、光軸方向に所定の厚みを有する環状枠部であり、その中央には光軸方向へ貫通する円形開口２３が形成されている。レンズ保持枠１０の保持環部１２は、この円形開口２３を通過可能な径である。一方、レンズ保持枠１０の外径フランジ１３は円形開口２３よりも大径であり、保持環部１２を円形開口２３に挿入させた状態で、外径フランジ１３と内径フランジ２２が光軸方向に対向する。内径フランジ２２の前面には、外径フランジ１３と対向する領域に、指標凹部群（選択嵌合指標部）２４、接着剤注入凹部（接着固定部）２５、位置調整段部（選択調整部）２６が、それぞれ３つずつ（３セット）形成されている。 The support cylinder 20 to which the lens holding frame 10 is assembled has an inner diameter flange 22 that protrudes in the inner diameter direction inside a cylindrical portion 21 centering on the optical axis O. The inner diameter flange 22 is an annular frame portion having a predetermined thickness in the optical axis direction, and a circular opening 23 penetrating in the optical axis direction is formed at the center thereof. The holding ring portion 12 of the lens holding frame 10 has a diameter that can pass through the circular opening 23. On the other hand, the outer diameter flange 13 of the lens holding frame 10 has a larger diameter than the circular opening 23, and the outer diameter flange 13 and the inner diameter flange 22 are arranged in the optical axis direction with the holding ring portion 12 inserted into the circular opening 23. opposite. On the front surface of the inner diameter flange 22, there are an index recess group (selection fitting index portion) 24, an adhesive injection recess (adhesion fixing portion) 25, and a position adjustment step (selection adjustment portion) in a region facing the outer diameter flange 13. 26 are formed in three (three sets) each.

レンズ保持枠１０側に設けた指標凸部１７と、支持筒２０側に設けた指標凹部群２４が、支持筒２０に対するレンズ保持枠１０の組み付け角を決める選択嵌合指標部を構成する。図５及び図６に示すように、３つの指標凹部群２４はそれぞれ、内径フランジ２２の前面に円形開口２３側（内縁側）に開放（連通）させて形成した、第１指標凹部２４ａ、第２指標凹部２４ｂ及び第３指標凹部２４ｃの３つの凹部により構成されている。つまり、内径フランジ２２上で指標凹部群２４を構成する凹部は３種類（２４ａ、２４ｂ、２４ｃ）を３つずつ（３セット）の計９つあり、レンズ保持枠１０に設けた３つの指標凸部１７を、このうちいずれか１種類（３つ）の凹部に対して選択的に嵌合させることができる。より具体的には、３つの第１指標凹部２４ａと、３つの第２指標凹部２４ｂと、３つの第３指標凹部２４ｃはいずれも周方向に略等間隔（１２０°間隔）で設けられており、レンズ保持枠１０は支持筒２０に対して、３つの指標凸部１７が３つの第１指標凹部２４ａに嵌合する第１の組付角度、３つの指標凸部１７が３つの第２指標凹部２４ｂに嵌合する第２の組付角度（図６）、３つの指標凸部１７が３つの第３指標凹部２４ｃに嵌合する第３の組付角度のいずれかを選択することができる。内径フランジ２２の前面にはさらに、第２指標凹部２４ｂと第３指標凹部２４ｃの外径側に隣接して、選択識別マーク２７、２８が形成されている。選択識別マーク２７は単一のドット状、選択識別マーク２８は径方向に２つ並ぶドット状に構成されている。選択識別マーク２７、２８を参照することにより、各指標凸部１７の嵌合対象が３つの指標凹部２４ａ、２４ｂ及び２４ｃのいずれであるか、すなわちレンズ保持枠１０が支持筒２０に対する３つの組付角度のいずれにあるかを容易に識別可能となっている。 The index convex part 17 provided on the lens holding frame 10 side and the index concave part group 24 provided on the support cylinder 20 side constitute a selective fitting index part that determines the assembly angle of the lens holding frame 10 with respect to the support cylinder 20. As shown in FIGS. 5 and 6, each of the three index recess groups 24 is formed on the front surface of the inner diameter flange 22 so as to open (communicate) with the circular opening 23 side (inner edge side). The two index recesses 24b and the third index recess 24c are constituted by three recesses. In other words, there are a total of nine recesses (three sets) of three types (24a, 24b, 24c), which constitute the index recess group 24 on the inner diameter flange 22, and three index projections provided on the lens holding frame 10 are provided. The portion 17 can be selectively fitted to any one (three) of the recesses. More specifically, the three first index recesses 24a, the three second index recesses 24b, and the three third index recesses 24c are all provided at substantially equal intervals (120 ° intervals) in the circumferential direction. The lens holding frame 10 has a first assembling angle at which the three index convex portions 17 fit into the three first index concave portions 24a with respect to the support cylinder 20, and the three index convex portions 17 have three second indexes. The second assembly angle that fits into the recess 24b (FIG. 6), and the third assembly angle at which the three index projections 17 fit into the three third index recesses 24c can be selected. . Further, selection identification marks 27 and 28 are formed on the front surface of the inner diameter flange 22 adjacent to the outer diameter sides of the second index recess 24b and the third index recess 24c. The selection identification mark 27 is constituted by a single dot, and the selection identification mark 28 is constituted by two dots arranged in the radial direction. By referring to the selection identification marks 27, 28, which of the three index recesses 24 a, 24 b, and 24 c is to be fitted to each index projection 17, that is, the lens holding frame 10 has three sets with respect to the support cylinder 20. It is possible to easily identify which of the attached angles.

レンズ保持枠１０側に設けた接着片部１８と、支持筒２０側に設けた接着剤注入凹部２５が、レンズ保持枠１０と支持筒２０を接着固定させる接着剤３０（図２）を注入可能な接着固定部を構成する。３つの接着剤注入凹部２５は、内径フランジ２２の前面に周方向に略等間隔（１２０°等配）で設けられた周方向に長い凹部であり、それぞれの接着剤注入凹部２５は円形開口２３側（内縁側）に開放（連通）されている。レンズ保持枠１０の３つの指標凸部１７を３つの指標凹部群２４（３つの第１指標凹部２４ａ、３つの第２指標凹部２４ｂ、３つの第３指標凹部２４ｃのいずれか）に嵌合させたときに、該レンズ保持枠１０に３箇所設けた接着片部１８が、それぞれ対応する接着剤注入凹部２５に対向（進入）して位置される。この対向状態で、接着剤注入凹部２５と接着片部１８の間には接着剤を注入可能な隙間が形成される。指標凸部１７の嵌合対象として第１指標凹部２４ａ、第２指標凹部２４ｂ、第３指標凹部２４ｃのいずれを選択するかによって、支持筒２０に対するレンズ保持枠１０の組付角度が変化するが、そのいずれを選択しても、各接着片部１８が対応する接着剤注入凹部２５からの対向位置を外れないように、接着片部１８と接着剤注入凹部２５の周方向長さ及び相対位置が設定されている。そして、図２に示すように、接着片部１８と接着剤注入凹部２５の間に注入した接着剤３０によって、レンズ保持枠１０を支持筒２０に固定することができる。それぞれの接着片部１８の外縁部における凹凸形状は、接着面積を増やし接着強度を高める効果を有する。 The adhesive piece 18 provided on the lens holding frame 10 side and the adhesive injection recess 25 provided on the support cylinder 20 side can inject an adhesive 30 (FIG. 2) for bonding and fixing the lens holding frame 10 and the support cylinder 20. A simple adhesive fixing part. The three adhesive injection recesses 25 are recesses that are long in the circumferential direction provided at substantially equal intervals (120 ° equidistant) in the circumferential direction on the front surface of the inner diameter flange 22, and each adhesive injection recess 25 has a circular opening 23. It is open (communication) to the side (inner edge side). The three index protrusions 17 of the lens holding frame 10 are fitted into three index recess groups 24 (any of the three first index recesses 24a, the three second index recesses 24b, and the three third index recesses 24c). The adhesive piece portions 18 provided at three locations on the lens holding frame 10 are positioned so as to face (enter) the corresponding adhesive injection recesses 25 respectively. In this facing state, a gap into which an adhesive can be injected is formed between the adhesive injection recess 25 and the adhesive piece 18. The assembly angle of the lens holding frame 10 with respect to the support cylinder 20 varies depending on which of the first index recess 24a, the second index recess 24b, and the third index recess 24c is selected as the fitting target of the index protrusion 17. The circumferential length and the relative position of the adhesive piece 18 and the adhesive injection recess 25 so that the adhesive piece 18 does not deviate from the corresponding position of the adhesive injection recess 25 regardless of which one is selected. Is set. As shown in FIG. 2, the lens holding frame 10 can be fixed to the support cylinder 20 by the adhesive 30 injected between the adhesive piece 18 and the adhesive injection recess 25. The concavo-convex shape at the outer edge of each adhesive piece 18 has the effect of increasing the adhesive area and increasing the adhesive strength.

レンズ保持枠１０側に設けた位置決め凸部１９と、支持筒２０側に設けた位置調整段部２６が、支持筒２０に対するレンズ保持枠１０の光軸方向位置を決める選択調整部を構成する。３つの位置調整段部２６はそれぞれ、光軸方向に位置を異ならせた３つの段差面を備えている。この３つの段差面のうち、後方位置決め面２６ａは最も光軸方向後方に位置しており、中間位置決め面２６ｂは光軸方向の中間位置にあり、前方位置決め面２６ｃは最も光軸方向前方に位置している。具体的には、図５に示すように、内径フランジ２２の前面には、周方向位置を異ならせてそれぞれ３つずつ（３セット）の指標凹部群２４、接着剤注入凹部２５、位置調整段部２６が形成されているが、これらは全て、光軸方向を深さ方向とする一続きの凹部として形成されている。そして、指標凹部群２４を構成する各指標凹部２４ａ、２４ｂ及び２４ｃの底面と、接着剤注入凹部２５の底面と、位置調整段部２６のうち中間位置決め面２６ｂは略面一の関係にある（同一の光軸方向位置にある）。後方位置決め面２６ａは、中間位置決め面２６ｂに対して光軸方向後方にオフセットした深度の大きい凹部として形成され、前方位置決め面２６ｃは、中間位置決め面２６ｂに対して光軸方向前方にオフセットした深度の小さい凹部（中間位置決め面２６ｂを基準にすると凸部）として形成されている。後方位置決め面２６ａ、中間位置決め面２６ｂ及び前方位置決め面２６ｃはいずれも光軸Ｏに対して略直交する平面である。 The positioning convex portion 19 provided on the lens holding frame 10 side and the position adjustment step portion 26 provided on the support tube 20 side constitute a selection adjustment unit that determines the position of the lens holding frame 10 in the optical axis direction with respect to the support tube 20. Each of the three position adjusting step portions 26 includes three step surfaces whose positions are different in the optical axis direction. Of these three step surfaces, the rear positioning surface 26a is positioned most rearward in the optical axis direction, the intermediate positioning surface 26b is positioned in the intermediate position in the optical axis direction, and the front positioning surface 26c is positioned most forward in the optical axis direction. is doing. Specifically, as shown in FIG. 5, three (three sets) of index recess groups 24, adhesive injection recesses 25, and position adjustment steps are provided on the front surface of the inner diameter flange 22, each having a different circumferential position. Although the part 26 is formed, all of these are formed as a continuous recess having the optical axis direction as the depth direction. The bottom surface of each of the index recesses 24a, 24b and 24c constituting the index recess group 24, the bottom surface of the adhesive injection recess 25, and the intermediate positioning surface 26b of the position adjustment step portion 26 are substantially flush with each other ( In the same optical axis position). The rear positioning surface 26a is formed as a recess having a large depth offset backward in the optical axis direction with respect to the intermediate positioning surface 26b, and the front positioning surface 26c has a depth offset forward in the optical axis direction with respect to the intermediate positioning surface 26b. It is formed as a small concave portion (a convex portion with respect to the intermediate positioning surface 26b). The rear positioning surface 26a, the intermediate positioning surface 26b, and the front positioning surface 26c are all flat surfaces that are substantially orthogonal to the optical axis O.

３つの後方位置決め面２６ａ、３つの中間位置決め面２６ｂ、３つの前方位置決め面２６ｃはいずれも、周方向に略等間隔（１２０°等配）で設けられている。指標凸部１７を第１指標凹部２４ａに嵌合させる上記の第１の組付角度では、レンズ保持枠１０に設けた３つの位置決め凸部１９は、支持筒２０側の３つの後方位置決め面２６ａに対応（対向）する位置関係にある。同様に、指標凸部１７を第２指標凹部２４ｂに嵌合させる上記の第２の組付角度では、レンズ保持枠１０の３つの位置決め凸部１９は、支持筒２０側の３つの中間位置決め面２６ｂに対応（対向）して位置し、指標凸部１７を第３指標凹部２４ｃに嵌合させる上記の第３の組付角度では、レンズ保持枠１０の３つの位置決め凸部１９は支持筒２０側の３つの前方位置決め面２６ｃに対応（対向）して位置する。そして、それぞれの位置決め凸部１９が、後方位置決め面２６ａ、中間位置決め面２６ｂ及び前方位置決め面２６ｃのいずれかに当接することで、支持筒２０に対するレンズ保持枠１０の光軸方向位置が決まる。図７に示すように、位置決め凸部１９が中間位置決め面２６ｂに当接する状態をレンズ保持枠１０（レンズ群ＬＧ）の光軸方向の中間位置とした場合、位置決め凸部１９が後方位置決め面２６ａに当接するときは、レンズ保持枠１０（レンズ群ＬＧ）が該中間位置よりも後方（像面側）に位置し、位置決め凸部１９が前方位置決め面２６ｃに当接するときは、レンズ保持枠１０（レンズ群ＬＧ）が該中間位置よりも前方（被写体側）に位置する。つまり、指標凸部１７の嵌合対象を、指標凹部群２４における第１指標凹部２４ａ、第２指標凹部２４ｂ、第３指標凹部２４ｃから任意に選択することにより、位置決め凸部１９の当接対象を後方位置決め面２６ａ、中間位置決め面２６ｂ、前方位置決め面２６ｃのいずれかに決めることができ、これによって支持筒２０に対するレンズ保持枠１０の光軸方向位置（厳密には、光軸方向後方への挿入移動端）を変化させることができる。 The three rear positioning surfaces 26a, the three intermediate positioning surfaces 26b, and the three front positioning surfaces 26c are all provided at substantially equal intervals (120 ° equidistant) in the circumferential direction. At the first assembling angle at which the index convex portion 17 is fitted into the first index concave portion 24a, the three positioning convex portions 19 provided on the lens holding frame 10 have three rear positioning surfaces 26a on the support cylinder 20 side. Are in a positional relationship corresponding to (facing). Similarly, at the second assembly angle at which the index convex portion 17 is fitted into the second index concave portion 24b, the three positioning convex portions 19 of the lens holding frame 10 have three intermediate positioning surfaces on the support cylinder 20 side. The three positioning projections 19 of the lens holding frame 10 are positioned at the support cylinder 20 at the third assembly angle that is positioned corresponding to (opposite) 26b and that fits the index projection 17 into the third index recess 24c. It is located corresponding to (opposite) the three front positioning surfaces 26c on the side. Each positioning projection 19 abuts on any one of the rear positioning surface 26a, the intermediate positioning surface 26b, and the front positioning surface 26c, whereby the position in the optical axis direction of the lens holding frame 10 with respect to the support cylinder 20 is determined. As shown in FIG. 7, when the state in which the positioning convex portion 19 is in contact with the intermediate positioning surface 26b is the intermediate position in the optical axis direction of the lens holding frame 10 (lens group LG), the positioning convex portion 19 is the rear positioning surface 26a. When the lens holding frame 10 (lens group LG) is positioned rearward (image surface side) of the intermediate position, and when the positioning convex portion 19 contacts the front positioning surface 26c, the lens holding frame 10 (Lens group LG) is positioned in front of the intermediate position (subject side). That is, the target of contact of the positioning convex portion 19 can be selected by arbitrarily selecting the fitting target of the index convex portion 17 from the first index concave portion 24a, the second index concave portion 24b, and the third index concave portion 24c in the index concave group 24. Can be determined as any one of the rear positioning surface 26a, the intermediate positioning surface 26b, and the front positioning surface 26c, whereby the position of the lens holding frame 10 relative to the support cylinder 20 in the optical axis direction (strictly speaking, the rearward in the optical axis direction). The insertion movement end) can be changed.

なお、位置調整段部２６に対して位置決め凸部１９を当接させるとき、その当接対象として３種類の位置決め面２６ａ、２６ｂ及び２６ｃのいずれを選択しても、位置決め凸部１９と位置調整段部２６の当接よりも先に指標凸部１７と指標凹部群２４の底面や、接着片部１８と接着剤注入凹部２５の底面が当接（干渉）しないように、これらの間には光軸方向に所定のクリアランスが確保されている。より詳しくは、３種類の位置決め面２６ａ、２６ｂ及び２６ｃのうち後方位置決め面２６ａに対して位置決め凸部１９を当接させるときに外径フランジ１３と内径フランジ２２が最も光軸方向に接近するが、このときに、指標凸部１７と指標凹部群２４の底面、接着片部１８と接着剤注入凹部２５の底面が当接しないようにそれぞれのクリアランスが設定されている。本実施形態では、位置調整段部２６の中間位置決め面２６ｂが指標凹部群２４及び接着剤注入凹部２５の底面と略面一になっているが、後方位置決め面２６ａを指標凹部群２４及び接着剤注入凹部２５の底面と略面一に位置させれば、上記のクリアランスは大きくなる。このような変形も可能である。 When the positioning convex portion 19 is brought into contact with the position adjustment step portion 26, the positioning convex portion 19 and the position adjustment are performed regardless of which of the three types of positioning surfaces 26a, 26b, and 26c is selected as the contact target. In order to prevent the bottom surface of the index convex portion 17 and the index concave portion group 24 and the bottom surface of the adhesive piece portion 18 and the adhesive injection concave portion 25 from abutting (interfering) before the contact of the stepped portion 26, there is no gap between them. A predetermined clearance is secured in the optical axis direction. More specifically, the outer diameter flange 13 and the inner diameter flange 22 are closest in the optical axis direction when the positioning protrusion 19 is brought into contact with the rear positioning surface 26a among the three types of positioning surfaces 26a, 26b, and 26c. At this time, the respective clearances are set so that the index convex portion 17 and the bottom surface of the index concave portion group 24 and the adhesive piece portion 18 and the bottom surface of the adhesive injection concave portion 25 do not contact each other. In the present embodiment, the intermediate positioning surface 26b of the position adjustment step portion 26 is substantially flush with the bottom surfaces of the index recess group 24 and the adhesive injection recess 25, but the rear positioning surface 26a is replaced with the index recess group 24 and the adhesive. If the injection recess 25 is positioned substantially flush with the bottom surface, the clearance is increased. Such a modification is also possible.

以上のレンズ保持構造における組み付けの態様を説明する。まず、レンズ保持枠１０の保持環部１２内に、スペーサー１１を挟んで第１レンズＬ１と第２レンズＬ２を保持させておく。続いて、保持環部１２の後端部を円形開口２３内に挿入させて、光軸方向前方から後方に向けてレンズ保持枠１０を支持筒２０に組み付けていく。ここで、レンズ保持枠１０に設けた３つの指標凸部１７の嵌合対象を、第１指標凹部２４ａ、第２指標凹部２４ｂ及び第３指標凹部２４ｃの中から選択する。前述の通り、指標凸部１７を第１指標凹部２４ａに嵌合させる第１の組付角度では、位置決め凸部１９と後方位置決め面２６ａの当接によってレンズ保持枠１０の光軸方向位置が決まる。同様に、指標凸部１７を第２指標凹部２４ｂに嵌合させる第２の組付角度では、位置決め凸部１９と中間位置決め面２６ｂの当接によってレンズ保持枠１０の光軸方向位置が決まり、指標凸部１７を第３指標凹部２４ｃに嵌合させる第３の組付角度では、位置決め凸部１９と前方位置決め面２６ｃの当接によってレンズ保持枠１０の光軸方向位置が決まる。この３パターンのうち最適な光学性能が得られる組付位置を選択したら、接着剤注入凹部２５と接着片部１８の間に接着剤３０（図２）を注入してレンズ保持枠１０を支持筒２０に固定させる。 The manner of assembly in the above lens holding structure will be described. First, the first lens L1 and the second lens L2 are held in the holding ring portion 12 of the lens holding frame 10 with the spacer 11 interposed therebetween. Subsequently, the rear end portion of the holding ring portion 12 is inserted into the circular opening 23, and the lens holding frame 10 is assembled to the support cylinder 20 from the front to the rear in the optical axis direction. Here, the fitting target of the three index protrusions 17 provided on the lens holding frame 10 is selected from the first index recess 24a, the second index recess 24b, and the third index recess 24c. As described above, at the first assembly angle in which the index convex portion 17 is fitted into the first index concave portion 24a, the position of the lens holding frame 10 in the optical axis direction is determined by the contact between the positioning convex portion 19 and the rear positioning surface 26a. . Similarly, at the second assembly angle at which the index convex portion 17 is fitted into the second index concave portion 24b, the position of the lens holding frame 10 in the optical axis direction is determined by the contact between the positioning convex portion 19 and the intermediate positioning surface 26b. At the third assembly angle in which the index convex portion 17 is fitted into the third index concave portion 24c, the position of the lens holding frame 10 in the optical axis direction is determined by the contact between the positioning convex portion 19 and the front positioning surface 26c. When an assembly position that provides optimum optical performance is selected from the three patterns, an adhesive 30 (FIG. 2) is injected between the adhesive injection recess 25 and the adhesive piece 18 to support the lens holding frame 10 as a support cylinder. 20 is fixed.

このレンズ保持構造によると、３種類の位置決め面２６ａ、２６ｂ及び２６ｃに対して選択的に位置決め凸部１９を当接させることで支持筒２０に対するレンズ保持枠１０の光軸方向位置が決まる。そして、位置決め凸部１９の当接対象の選択は、指標凹部群２４を構成する３種類の指標凹部２４ａ、２４ｂ及び２４ｃと指標凸部１７との嵌合によるステップワイズな組付位置設定で行うことができるため、ねじのような無段階の調整機構に比して調整作業が容易である。指標凹部２４ａ、２４ｂ及び２４ｃに対して指標凸部１７を選択的に嵌合させた状態では、レンズ保持枠１０に対して回転方向や回転方向以外の光軸直交方向の力を加えても、当該嵌合部分によって支持筒２０に対するレンズ保持枠１０の相対移動が規制されるため、位置決め凸部１９と位置調整段部２６（位置決め面２６ａ、２６ｂ及び２６ｃのうちいずれか）の当接関係がずれてしまうおそれがない。 According to this lens holding structure, the position in the optical axis direction of the lens holding frame 10 with respect to the support cylinder 20 is determined by selectively abutting the positioning convex portions 19 against the three types of positioning surfaces 26a, 26b and 26c. Then, the selection of the contact target of the positioning convex portion 19 is performed by setting the stepwise assembly position by fitting the three types of the index concave portions 24a, 24b and 24c constituting the index concave portion group 24 with the index convex portion 17. Therefore, the adjustment work is easier than a stepless adjustment mechanism such as a screw. In a state where the index convex portion 17 is selectively fitted to the index concave portions 24a, 24b, and 24c, even if a force in the optical axis orthogonal direction other than the rotational direction and the rotational direction is applied to the lens holding frame 10, Since the relative movement of the lens holding frame 10 with respect to the support cylinder 20 is restricted by the fitting portion, the contact relationship between the positioning convex portion 19 and the position adjustment step portion 26 (any one of the positioning surfaces 26a, 26b, and 26c) is established. There is no risk of shifting.

また、指標凹部群２４における３種類の指標凹部２４ａ、２４ｂ及び２４ｃの識別を容易にする選択識別マーク２７、２８を設けたことで、支持筒２０に対するレンズ保持枠１０の組付角度の選択を誤るおそれが軽減される。特に、選択識別マーク２７、２８を構成するドットの数がレンズ保持枠１０の光軸方向位置に対応しており、ドット数０（指標凹部２４ａ）が最も光軸方向後方、ドット数１（指標凹部２４ｂ）が中間位置、ドット数２（指標凹部２４ｃ）が最も光軸方向前方のレンズ位置を意味するため、指標凸部１７を嵌合させるべき対象を直感的に選択することができる。 Further, by providing selection identification marks 27 and 28 that facilitate identification of the three types of index recesses 24a, 24b, and 24c in the index recess group 24, the assembly angle of the lens holding frame 10 with respect to the support cylinder 20 can be selected. The risk of mistakes is reduced. In particular, the number of dots constituting the selection identification marks 27 and 28 corresponds to the position in the optical axis direction of the lens holding frame 10, and the dot number 0 (index concave portion 24a) is the rearmost in the optical axis direction, and the dot number 1 (index). Since the concave portion 24b) is an intermediate position, and the number of dots 2 (index concave portion 24c) is the lens position forward in the optical axis direction, the target to which the index convex portion 17 should be fitted can be selected intuitively.

また、レンズ保持枠１０と支持筒２０のそれぞれで、レンズ群ＬＧの位置調整に関係する各要素が、スペース効率良く生産性に優れた形態で設けられている。レンズ保持枠１０においては、指標凸部１７と位置決め凸部１９が外径フランジ１３からの突出部として構成され、接着片部１８が外径フランジ１３の外周面１６上の凹部を用いて構成されているため、レンズ保持枠１０を成形品として製造する場合に、これらの要素をシンプルな成形型で容易に形成することができる。また、前述の通り、支持筒２０における指標凹部群２４と接着剤注入凹部２５と位置調整段部２６は、内径フランジ２２の前面における一続きの凹部として構成されているため、支持筒２０を成形品とする場合、前方へ離型される成形型によって容易に形成することができる。 Further, in each of the lens holding frame 10 and the support cylinder 20, each element related to the position adjustment of the lens group LG is provided in a form with excellent space efficiency and high productivity. In the lens holding frame 10, the index convex portion 17 and the positioning convex portion 19 are configured as protruding portions from the outer diameter flange 13, and the adhesive piece portion 18 is configured using a concave portion on the outer peripheral surface 16 of the outer diameter flange 13. Therefore, when manufacturing the lens holding frame 10 as a molded product, these elements can be easily formed with a simple mold. Further, as described above, the index recess group 24, the adhesive injection recess 25, and the position adjustment step portion 26 in the support cylinder 20 are configured as a continuous recess in the front surface of the inner diameter flange 22. In the case of a product, it can be easily formed by a mold that is released forward.

周方向の隣接関係にある各１つの指標凸部１７、接着片部１８及び位置決め凸部１９を、レンズ保持枠１０側における１セットの組付部とし、周方向の隣接関係にある各１つの指標凹部群２４、接着剤注入凹部２５及び位置調整段部２６を、支持筒２０側における１セットの組付部とすると、レンズ保持枠１０と支持筒２０には、同じ形態の組付部が周方向に等間隔で３セットずつ設けられている。よって、支持筒２０に対するレンズ保持枠１０の光軸方向位置調整のために上記の第１、第２、第３の組付角度（指標凸部１７の嵌合対象を第１指標凹部２４ａ、第２指標凹部２４ｂ、第３指標凹部２４ｃのいずれにするか）を選択するとき、それぞれの組付角度でさらに３つの異なる周方向位相を選択することができる。設計上は、この３つのうちいずれの周方向位相を選んでも光学性能は共通であるが、部品の製造誤差を考慮して、組み付け段階で最適な光学性能が得られる周方向位相を選択することができる。つまり、組付部を１セットだけ備える形態に比して、より精密な位置調整が可能となる。レンズ保持枠１０と支持筒２０の間で３セットの組付部をどのような周方向位相で組み合わせるかは、個々の製品ごとに決めてもよいが、特定のロットで共通の組付位置を選択するのが実際的である。その場合に、３つの指標凸部１７のうち１つに設けた位相識別マーク１７ａを参照することによって、３つの周方向位相のうちいずれを選択しているかを識別することができる。 Each one of the index convex portions 17, the adhesive piece portions 18, and the positioning convex portions 19 that are adjacent to each other in the circumferential direction is used as a set of assembling portions on the lens holding frame 10 side. When the index recess group 24, the adhesive injection recess 25, and the position adjustment step portion 26 are a set of assembly portions on the support tube 20 side, the lens holding frame 10 and the support tube 20 have assembly portions of the same form. Three sets are provided at equal intervals in the circumferential direction. Therefore, in order to adjust the position of the lens holding frame 10 with respect to the support cylinder 20 in the optical axis direction, the first, second, and third assembly angles (the fitting target of the index projection 17 is designated as the first index recess 24a, the first When selecting either the 2 index recess 24b or the 3rd index recess 24c), three different circumferential phases can be selected at the respective assembly angles. In terms of design, optical performance is the same regardless of which of these three circumferential phases is selected, but in consideration of component manufacturing errors, a circumferential phase that provides optimum optical performance at the assembly stage should be selected. Can do. That is, more precise position adjustment is possible as compared with a mode in which only one set of the assembling part is provided. Although what kind of circumferential phase the three sets of assembly parts are combined between the lens holding frame 10 and the support cylinder 20 may be determined for each individual product, a common assembly position for a specific lot is determined. It is practical to choose. In that case, it is possible to identify which one of the three circumferential phases is selected by referring to the phase identification mark 17 a provided on one of the three index convex portions 17.

図５及び図６に示すように、レンズ保持枠１０と支持筒２０の間に設けられる選択調整部（位置決め凸部１９及び位置調整段部２６）と、選択嵌合指標部（指標凸部１７及び指標凹部群２４）と、接着固定部（接着片部１８及び接着剤注入凹部２５）は、光軸Ｏを中心とする略同一円周上に配置されている。この配置はスペース効率に優れると共に、支持筒２０に対するレンズ保持枠１０の支持安定性の向上にも寄与する。 As shown in FIGS. 5 and 6, a selection adjustment portion (positioning convex portion 19 and position adjustment step portion 26) provided between the lens holding frame 10 and the support cylinder 20, and a selection fitting indicator portion (index convex portion 17). And the index recess group 24) and the adhesive fixing portion (the adhesive piece portion 18 and the adhesive injection recess 25) are arranged on substantially the same circumference centered on the optical axis O. This arrangement is excellent in space efficiency and contributes to improvement in the support stability of the lens holding frame 10 with respect to the support cylinder 20.

以上、図示実施形態に基づき説明したが、本発明はこの実施形態に限定されるものではない。例えば、図示実施形態では、レンズ保持枠１０の外径フランジ１３と支持筒２０の内径フランジ２２にそれぞれ選択調整部（位置決め凸部１９及び位置調整段部２６）と選択嵌合指標部（指標凸部１７及び指標凹部群２４）と接着固定部（接着片部１８及び接着剤注入凹部２５）を形成しているが、これらの要素をフランジ以外の位置（例えば環状部材や筒状部材の対向端面）に形成することもできる。 As mentioned above, although demonstrated based on illustration embodiment, this invention is not limited to this embodiment. For example, in the illustrated embodiment, a selection adjustment portion (positioning convex portion 19 and position adjustment step portion 26) and a selection fitting indicator portion (index protrusion) are respectively provided on the outer diameter flange 13 of the lens holding frame 10 and the inner diameter flange 22 of the support tube 20. Part 17 and index recess group 24) and an adhesive fixing part (adhesive piece 18 and adhesive injection recess 25), but these elements are positioned at positions other than the flange (for example, opposite end surfaces of an annular member or a cylindrical member) ) Can also be formed.

また、図示実施形態とは逆に、指標凹部群２４と位置調整段部２６のような凹状部をレンズ保持枠１０側（例えば外径フランジ１３の後面１５）に形成し、指標凸部１７と位置決め凸部１９のような突出部を支持筒２０側（例えば内径フランジ２２の前面）に形成することも可能である。この場合、接着剤注入凹部２５と接着片部１８に相当する接着固定部の配置（凹凸関係）も、レンズ保持枠１０側と支持筒２０側で逆にすることが可能である。しかし、液垂れした接着剤がレンズ群ＬＧに付着するリスクを避けるため、接着固定部については図示実施形態の通り、支持筒２０側に凹部（接着剤注入凹部２５）を形成し、該凹部に進入可能な接片部（接着片部１８）をレンズ保持枠１０側に形成するという関係が望ましい。 Contrary to the illustrated embodiment, concave portions such as the index concave group 24 and the position adjustment step portion 26 are formed on the lens holding frame 10 side (for example, the rear surface 15 of the outer diameter flange 13). It is also possible to form a protruding portion such as the positioning convex portion 19 on the support cylinder 20 side (for example, the front surface of the inner diameter flange 22). In this case, the arrangement (concave / convex relationship) of the adhesive fixing portions corresponding to the adhesive injection concave portion 25 and the adhesive piece portion 18 can be reversed between the lens holding frame 10 side and the support cylinder 20 side. However, in order to avoid the risk that the dripping adhesive adheres to the lens group LG, the adhesive fixing part is formed with a concave part (adhesive injection concave part 25) on the support tube 20 side as shown in the illustrated embodiment, and the concave part is formed in the concave part. It is desirable that the contact piece part (adhesive piece part 18) that can enter is formed on the lens holding frame 10 side.

さらに、図示実施形態では、指標凸部１７と位置決め凸部１９をレンズ保持枠１０側に設け、指標凹部群２４と位置調整段部２６を支持筒２０側に設けているが、レンズ保持枠１０と支持筒２０における選択調整部と選択嵌合指標部の配置関係は、これに限定されない。例えば、位置決め凸部１９をレンズ保持枠１０に形成する一方で、指標凸部１７に相当する部位を支持筒２０側に設け（具体的には内径フランジ２２の内径方向に突出する凸部として形成し）、位置調整段部２６を支持筒２０に形成する一方で、指標凹部群２４に相当する部位をレンズ保持枠１０側に設ける（具体的には外径フランジ１３の外周面から内径方向に向く複数の凹部として形成する）態様にすることも可能である。逆に、指標凸部１７をレンズ保持枠１０に形成する一方で、位置決め凸部１９に相当する部位を支持筒２０側に設け（具体的には内径フランジ２２から光軸方向前方に突出する凸部として形成し）、指標凹部群２４を支持筒２０に形成する一方で、位置調整段部２６に相当する部位をレンズ保持枠１０側に設ける（具体的には外径フランジ１３の後面１５上の複数の段差面として形成する）態様にすることも可能である。 Furthermore, in the illustrated embodiment, the index convex portion 17 and the positioning convex portion 19 are provided on the lens holding frame 10 side, and the index concave portion group 24 and the position adjustment step portion 26 are provided on the support cylinder 20 side. The arrangement relationship between the selection adjustment portion and the selection fitting indicator portion in the support cylinder 20 is not limited to this. For example, the positioning convex portion 19 is formed on the lens holding frame 10, while the portion corresponding to the index convex portion 17 is provided on the support cylinder 20 side (specifically, formed as a convex portion protruding in the inner diameter direction of the inner diameter flange 22. In addition, while the position adjustment step portion 26 is formed in the support cylinder 20, a portion corresponding to the index recess group 24 is provided on the lens holding frame 10 side (specifically, from the outer peripheral surface of the outer diameter flange 13 to the inner diameter direction). It is also possible to form a plurality of concave portions facing each other. On the contrary, while the index convex portion 17 is formed on the lens holding frame 10, a portion corresponding to the positioning convex portion 19 is provided on the support tube 20 side (specifically, the convex portion protruding forward in the optical axis direction from the inner diameter flange 22). The index recess group 24 is formed in the support cylinder 20 while a portion corresponding to the position adjustment step portion 26 is provided on the lens holding frame 10 side (specifically, on the rear surface 15 of the outer diameter flange 13). (A plurality of step surfaces).

また、実施形態では、支持筒２０に対するレンズ保持枠１０の光軸方向位置調整を３段階としたが、２段階の調整にとどめることや、４段階以上の調整を行わせることもできる。具体的には、指標凹部群２４における指標凹部の数と、位置調整段部２６における位置決め面の数を、互いの数的関係を保ちつつ変化させることで、調整段数を異ならせることができる。 Further, in the embodiment, the optical axis direction position adjustment of the lens holding frame 10 with respect to the support cylinder 20 is performed in three stages. However, the adjustment can be limited to two stages or can be performed in four or more stages. Specifically, the number of adjustment steps can be made different by changing the number of index recesses in the index recess group 24 and the number of positioning surfaces in the position adjustment step portion 26 while maintaining the mutual numerical relationship.

また、実施形態では、選択調整部（位置決め凸部１９及び位置調整段部２６）と選択嵌合指標部（指標凸部１７及び指標凹部群２４）と接着固定部（接着片部１８及び接着剤注入凹部２５）をそれぞれ３つ（３セット）備えているが、これらの数も任意に設定可能である。支持筒２０に対するレンズ保持枠１０の支持安定性とスペース効率との両立という観点では、実施形態のように周方向位置の異なる３箇所で位置決めすることが好ましいが、２箇所以下、あるいは４箇所以上の数で位置決めすることも可能である。 In the embodiment, the selection adjustment unit (positioning convex part 19 and position adjustment step part 26), the selection fitting index part (index convex part 17 and index concave group 24), and the adhesive fixing part (adhesive piece 18 and adhesive) Each of the injection recesses 25) is provided with three (three sets), but these numbers can be arbitrarily set. From the viewpoint of achieving both support stability of the lens holding frame 10 with respect to the support cylinder 20 and space efficiency, it is preferable to perform positioning at three different positions in the circumferential direction as in the embodiment, but two or less, or four or more. It is also possible to position by the number of.

また、本発明は調整されるレンズ（群）の具体的形態を問うものではない。実施形態では、第１レンズＬ１と第２レンズＬ２からなるレンズ群ＬＧを調整の対象としているが、単レンズ、あるいは３枚以上のレンズからなるレンズ群を調整対象としてもよい。 The present invention does not ask the specific form of the lens (group) to be adjusted. In the embodiment, the lens group LG including the first lens L1 and the second lens L2 is an adjustment target. However, a single lens or a lens group including three or more lenses may be the adjustment target.

ＬＧレンズ群
Ｌ１第１レンズ
Ｌ２第２レンズ
１０レンズ保持枠
１２保持環部
１３外径フランジ
１７指標凸部（選択嵌合指標部）
１７ａ位相識別マーク
１８接着片部（接着固定部）
１９位置決め凸部（選択調整部、当接部）
２０支持筒
２１筒状部
２２内径フランジ
２３円形開口
２４指標凹部群（選択嵌合指標部）
２４ａ第１指標凹部
２４ｂ第２指標凹部
２４ｃ第３指標凹部
２５接着剤注入凹部（接着固定部）
２６位置調整段部（選択調整部）
２６ａ後方位置決め面
２６ｂ中間位置決め面
２６ｃ前方位置決め面
２７２８選択識別マーク
３０接着剤 LG lens group L1 first lens L2 second lens 10 lens holding frame 12 holding ring portion 13 outer diameter flange 17 index convex portion (selective fitting index portion)
17a Phase identification mark 18 Adhesive piece (adhesive fixing part)
19 Positioning convex part (selection adjustment part, contact part)
20 support cylinder 21 cylindrical part 22 inner diameter flange 23 circular opening 24 index recess group (selective fitting index part)
24a First index recess 24b Second index recess 24c Third index recess 25 Adhesive injection recess (adhesion fixing part)
26 Position adjustment step (selection adjustment unit)
26a Rear positioning surface 26b Intermediate positioning surface 26c Front positioning surface 27 28 Selection identification mark 30 Adhesive

Claims

レンズを固定的に保持するレンズ保持枠を、支持筒に対して光軸方向に位置調整可能に支持させるレンズ調整機構において、
上記レンズ保持枠と上記支持筒の間に、
光軸を中心とする周方向位置及び光軸方向の面位置を互いに異ならせた複数の位置決め面と、該複数の位置決め面に選択的に当接可能な当接部とからなり、該当接によって上記支持筒に対する上記レンズ保持枠の光軸方向位置を決める選択調整部；及び
上記複数の位置決め面に対応する周方向間隔の複数の指標凹部と、該複数の指標凹部に選択的に嵌合可能な指標凸部とからなり、該選択嵌合によって上記当接部が当接する上記位置決め面を決める選択嵌合指標部；
を備えたことを特徴とするレンズ調整機構。 In a lens adjustment mechanism that supports a lens holding frame that holds a lens in a fixed manner in the optical axis direction with respect to a support cylinder,
Between the lens holding frame and the support tube,
A plurality of positioning surfaces in which the circumferential position around the optical axis and the surface position in the optical axis direction are different from each other, and a contact portion that can selectively contact the plurality of positioning surfaces. A selective adjustment portion that determines the position of the lens holding frame in the optical axis direction relative to the support tube; and a plurality of circumferentially spaced index recesses corresponding to the plurality of positioning surfaces, and the plurality of index recesses can be selectively fitted A selective fitting index portion that determines the positioning surface on which the contact portion abuts by the selective fitting;
A lens adjustment mechanism comprising:

請求項１記載のレンズ調整機構において、上記複数の位置決め面と上記複数の指標凹部が上記レンズ保持枠と上記支持筒の一方に設けられ、上記当接部と上記指標凸部が上記レンズ保持枠と上記支持筒の他方に設けられていることを特徴とするレンズ調整機構。 2. The lens adjusting mechanism according to claim 1, wherein the plurality of positioning surfaces and the plurality of index concave portions are provided on one of the lens holding frame and the support cylinder, and the contact portion and the index convex portion are the lens holding frame. And a lens adjustment mechanism provided on the other of the support cylinders.

請求項２記載のレンズ調整機構において、上記支持筒の内側に設けられ光軸方向へ厚みを有する内径フランジと、上記レンズ保持枠の外径方向に突出して上記内径フランジと光軸方向に対向する外径フランジを有し、
上記複数の指標凹部は上記内径フランジの内縁に臨む凹部として形成され、上記複数の位置決め面は上記内径フランジ上の凹部の底面として形成されており、
上記指標凸部は、上記外径フランジの外周面から外径方向に突出する凸部として形成され、上記当接部は、上記外径フランジにおける内径フランジとの対向面から光軸方向に突出する凸部として形成されていることを特徴とするレンズ調整機構。 3. The lens adjustment mechanism according to claim 2, wherein an inner diameter flange that is provided inside the support tube and has a thickness in the optical axis direction, protrudes in an outer diameter direction of the lens holding frame, and faces the inner diameter flange in the optical axis direction. Has an outer diameter flange,
The plurality of index recesses are formed as recesses facing the inner edge of the inner diameter flange, and the plurality of positioning surfaces are formed as bottom surfaces of the recesses on the inner diameter flange,
The index convex portion is formed as a convex portion protruding in the outer radial direction from the outer peripheral surface of the outer diameter flange, and the contact portion protrudes in the optical axis direction from a surface of the outer diameter flange facing the inner diameter flange. A lens adjustment mechanism formed as a convex portion.

請求項３記載のレンズ調整機構において、
上記支持筒の内径フランジの内縁に臨む凹部として形成された接着剤注入凹部；及び
上記選択嵌合指標部の嵌合状態で上記接着剤注入凹部に進入する、上記外径フランジの一部をなしその外周面上に凹凸形状を有する接着片部；
からなり、上記複数の位置決め面のいずれに上記当接部が当接するときも上記接着剤注入凹部と上記接着片部の間に接着剤を注入可能な隙間を形成する接着固定部を備えることを特徴とするレンズ調整機構。 In the lens adjustment mechanism according to claim 3,
An adhesive injection recess formed as a recess facing the inner edge of the inner diameter flange of the support cylinder; and a part of the outer diameter flange that enters the adhesive injection recess in the fitted state of the selective fitting index portion. An adhesive piece having an irregular shape on its outer peripheral surface;
And an adhesive fixing portion that forms a gap in which an adhesive can be injected between the adhesive injection recess and the adhesive piece portion when the contact portion comes into contact with any of the plurality of positioning surfaces. Characteristic lens adjustment mechanism.

請求項４記載のレンズ調整機構において、上記複数の位置決め面と上記複数の指標凹部と上記接着剤注入凹部を構成する上記内径フランジ上の凹部は、互いに連通していることを特徴とするレンズ調整機構。 5. The lens adjustment mechanism according to claim 4, wherein the plurality of positioning surfaces, the plurality of index recesses, and the recesses on the inner diameter flange constituting the adhesive injection recesses communicate with each other. mechanism.

請求項４または５記載のレンズ調整機構において、上記選択調整部と上記選択嵌合指標部と上記接着固定部は、光軸を中心とする略同一円周上に位置することを特徴とするレンズ調整機構。 6. The lens adjustment mechanism according to claim 4, wherein the selection adjustment portion, the selection fitting indicator portion, and the adhesive fixing portion are located on substantially the same circumference centered on the optical axis. Adjustment mechanism.

請求項３ないし６のいずれか１項記載のレンズ調整機構において、上記支持筒の内径フランジの上記複数の指標凹部に隣接する位置に、指標凹部ごとに異なる形状の選択識別マークを有することを特徴とするレンズ調整機構。 The lens adjustment mechanism according to any one of claims 3 to 6, wherein a selection identification mark having a different shape is provided for each index recess at a position adjacent to the plurality of index recesses of the inner diameter flange of the support cylinder. Lens adjustment mechanism.

請求項１ないし７のいずれか１項記載のレンズ調整機構において、上記選択調整部と上記選択嵌合指標部はそれぞれ、周方向に略等間隔で３セット設けられていることを特徴とするレンズ調整機構。 8. The lens adjustment mechanism according to claim 1, wherein three sets of the selection adjustment portion and the selection fitting indicator portion are provided at substantially equal intervals in the circumferential direction. Adjustment mechanism.