JP2019179179A - Lens unit - Google Patents

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JP2019179179A
JP2019179179A JP2018069206A JP2018069206A JP2019179179A JP 2019179179 A JP2019179179 A JP 2019179179A JP 2018069206 A JP2018069206 A JP 2018069206A JP 2018069206 A JP2018069206 A JP 2018069206A JP 2019179179 A JP2019179179 A JP 2019179179A
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lens
lens barrel
barrel
press
lenses
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JP7117879B2 (en
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隆春 藤井
Takaharu Fujii
隆春 藤井
悟 木原
Satoru Kihara
悟 木原
翔 五月女
Sho Saotome
翔 五月女
金井　大輔
Daisuke Kanai
大輔 金井
宏介 杉木
Kosuke Sugiki
宏介 杉木
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Kyocera Corp
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Kyocera Corp
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Priority to US17/043,664 priority patent/US20210018715A1/en
Priority to PCT/JP2018/048563 priority patent/WO2019187460A1/en
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Abstract

To provide a lens unit that, when lenses are built into a lens barrel by a press-fit method, reduces a pressure generated on the lens barrel and lenses and reduces backlash between the lens barrel and lenses after the press fit.SOLUTION: A lens unit 10 has a plurality of lenses 1 built into a resin lens barrel 2, and the plurality of lenses 1 include an intermediate lens group 1a press-fit into the lens barrel 2 and lenses 1b on both ends arranged on both sides in the optical axis direction of the intermediate lens group 1a and fastened to the inside of the lens barrel 2 with retainers 3.SELECTED DRAWING: Figure 2

Description

本発明は、監視カメラや車載カメラ等で使用されるレンズユニットに関し、特にレンズを鏡筒内に組み込み収納する手段として、圧入固定を行うレンズユニットに関する。   The present invention relates to a lens unit used in a surveillance camera, an in-vehicle camera, and the like, and more particularly to a lens unit that performs press-fitting and fixing as means for incorporating and storing a lens in a lens barrel.

近年、監視カメラや車載カメラ等が普及している。監視カメラや車載カメラ（以下、車載カメラ等という）に搭載するレンズユニットは、使用環境が多岐に亘り、寒冷地から熱帯地方での使用を考慮に入れなければならず、低温から高温までの使用環境温度範囲で安定した性能が望まれる。   In recent years, surveillance cameras and in-vehicle cameras have become widespread. Lens units installed in surveillance cameras and in-vehicle cameras (hereinafter referred to as in-vehicle cameras) have a wide range of usage environments and must be used in cold to tropical regions. Stable performance in the ambient temperature range is desired.

鏡筒へのレンズ収納方法としては、レンズの外径を鏡筒の内径よりも小さくし、鏡筒の開口部より螺子固定される押え環（リテーナ）を用いてレンズを挟み込む方法や、レンズの外径を鏡筒の内径よりも大きくして、圧力を加えて組み込む圧入固定方法が採用されている。   The lens can be accommodated in the lens barrel by a method in which the outer diameter of the lens is made smaller than the inner diameter of the lens barrel and the lens is sandwiched using a presser ring (retainer) that is screwed from the opening of the lens barrel. A press-fit fixing method is adopted in which the outer diameter is made larger than the inner diameter of the lens barrel and is incorporated by applying pressure.

前者の押え環としては、鏡筒内に複数枚のレンズを挿入後、接着剤にて固定し、最終的に押え環に締め付ける方法が提案されている（特許文献１）。
一方、後者の圧入方法は、部品点数も少なく、簡便な組み込み方法ではあるが、圧入量の制御が難しい。圧入量を大きくするとレンズに対して大きな負荷が発生し、レンズに歪みが生じて光学性能を劣化させてしまう。逆に圧入量を少なくすると、高温環境下では、鏡筒とレンズ素材の線膨張率の違いから、レンズと鏡筒との嵌合部に緩み（ガタ）が発生する場合もあった。また、振動を受ける環境下にある場合、熱と振動とが相まってレンズ間の緩みがより大きくなる場合がある。そのため、レンズと鏡筒の間に緩衝部を設けて圧入することも提案されている（特許文献２）。 As the former presser ring, a method has been proposed in which a plurality of lenses are inserted into a lens barrel, fixed with an adhesive, and finally fastened to the presser ring (Patent Document 1).
On the other hand, the latter press-fitting method has a small number of parts and is a simple assembling method, but it is difficult to control the press-fitting amount. When the press-fitting amount is increased, a large load is generated on the lens, and the lens is distorted to deteriorate the optical performance. On the other hand, when the amount of press-fitting is reduced, loosening (playback) may occur in the fitting portion between the lens and the lens barrel due to the difference in linear expansion coefficient between the lens barrel and the lens material in a high temperature environment. In addition, when the environment is subject to vibration, the looseness between the lenses may become larger due to the combination of heat and vibration. For this reason, it has also been proposed to press-fit by providing a buffer portion between the lens and the lens barrel (Patent Document 2).

さらに、鏡筒へレンズを接着固定する方法は、部品点数が少なくなる反面、接着剤の多くは紫外線硬化型が使用されているため、硬化が不十分であると接着力の低下が生じ、ガタを発生させるおそれがある。また、接着が均等に行われなかったり、接着剤の成分が気化してレンズに付着して曇りを生じるなどのおそれもある。
一方、緩衝部材を用いた圧入方式では、部品点数を抑えることができず、結果的にはコストアップになる恐れもあった。 Furthermore, the method of adhering and fixing the lens to the lens barrel reduces the number of parts, but since many of the adhesives are UV-curing, the adhesive strength is reduced if the curing is insufficient, and there is a backlash. May occur. In addition, there is a possibility that the bonding is not performed evenly, or the components of the adhesive are vaporized and adhere to the lens to cause fogging.
On the other hand, in the press-fitting method using the buffer member, the number of parts cannot be suppressed, and as a result, the cost may increase.

それゆえ、鏡筒にレンズを圧入方式で組み込む際に、鏡筒やレンズに生じる圧力を低減させ、且つ振動時や高温環境下においても圧入後にガタが生じないレンズユニットが望まれている。   Therefore, there is a demand for a lens unit that reduces the pressure generated in the lens barrel and the lens when the lens is assembled into the lens barrel by the press-fitting method, and does not cause backlash after press-fitting even during vibration or in a high temperature environment.

特開２００９−２４４３９３号公報JP 2009-244393 A 特許６１８２３８０号公報Japanese Patent No. 6182380

本発明の課題は、レンズを鏡筒に圧入方式で組込む際に、鏡筒およびレンズに生じる圧力を低減させ、且つ圧入後に鏡筒とレンズとの間にガタが生じないレンズユニットを提供することである。   An object of the present invention is to provide a lens unit that reduces pressure generated in the lens barrel and the lens when the lens is assembled into the lens barrel in a press-fitting manner, and that does not cause backlash between the lens barrel and the lens after press-fitting. It is.

上記課題を解決するための本発明の実施形態は、以下のような構成を有する。
（１）複数のレンズが樹脂製の鏡筒内に組み込まれたレンズユニットであって、前記複数のレンズが、前記鏡筒内に圧入された中間レンズ群と、この中間レンズ群の光軸方向両側に配置され、リテーナにより前記鏡筒内に締結された両末端レンズと、を含むことを特徴とするレンズユニット。
（２）前記リテーナが弾性体で構成されている（１）記載のレンズユニット。
（３）前記鏡筒の内周面には、鏡筒内に弦状に突出し、組み込まれた中間レンズ群が圧入される少なくとも１つの突出部が形成されている（１）または（２）に記載のレンズユニット。
（４）前記鏡筒は、肉厚部と肉薄部とを有し、前記肉薄部には、内周面に前記突出部が形成された部位を含む領域の外周面に凹部が形成されている（３）に記載のレンズユニット。
（５）前記突出部が、前記鏡筒の内周面に所定間隔で形成される（３）または（４）に記載のレンズユニット。
（６）前記鏡筒の内周面には、鏡筒両端部よりレンズを組み込む際にレンズの一方の面の周縁が当接する基準位置となる突出部が形成されている（３）から（５）のいずれかに記載のレンズユニット。 An embodiment of the present invention for solving the above problems has the following configuration.
(1) A lens unit in which a plurality of lenses are incorporated in a resin lens barrel, wherein the plurality of lenses are press-fitted into the lens barrel, and an optical axis direction of the intermediate lens group A lens unit comprising: both end lenses disposed on both sides and fastened in the lens barrel by a retainer.
(2) The lens unit according to (1), wherein the retainer is made of an elastic body.
(3) The inner peripheral surface of the lens barrel is formed with at least one projecting portion that protrudes into a string shape into the lens barrel and into which the incorporated intermediate lens group is press-fitted (1) or (2). The lens unit described.
(4) The lens barrel has a thick portion and a thin portion, and the thin portion has a recess formed in an outer peripheral surface of a region including a portion where the protruding portion is formed on the inner peripheral surface. The lens unit according to (3).
(5) The lens unit according to (3) or (4), wherein the protrusions are formed at predetermined intervals on the inner peripheral surface of the lens barrel.
(6) On the inner peripheral surface of the lens barrel, a protrusion is formed as a reference position where the periphery of one surface of the lens abuts when the lens is assembled from both ends of the lens barrel (3) to (5 The lens unit according to any one of the above.

本発明によれば、鏡筒内に最低限の圧入圧で中間レンズ群が組み込まれており、且つ中間レンズ群の光軸方向両側に配置され、リテーナにより前記鏡筒内に両末端レンズが締結されているので、鏡筒やレンズに生じる圧力を低減させることができる。さらに、樹脂製の鏡筒が環境温度変化に伴う線膨張を吸収できるので、圧入後に温度変化によってレンズにガタが生じることはない。   According to the present invention, the intermediate lens group is incorporated in the lens barrel with a minimum press-fitting pressure, and is arranged on both sides in the optical axis direction of the intermediate lens group, and both end lenses are fastened in the lens barrel by the retainer. Therefore, the pressure generated in the lens barrel and the lens can be reduced. Furthermore, since the resin lens barrel can absorb the linear expansion associated with the environmental temperature change, the lens does not play due to the temperature change after the press-fitting.

本発明の一実施形態に係るレンズユニットを有するカメラを示す斜視図である。It is a perspective view which shows the camera which has a lens unit which concerns on one Embodiment of this invention. 図１に示すレンズユニットの断面図である。It is sectional drawing of the lens unit shown in FIG. 図１に示すレンズユニットの破断斜視図である。FIG. 2 is a cutaway perspective view of the lens unit shown in FIG. 1. 図１に示すレンズユニットの鏡筒を示す斜視断面図である。It is a perspective sectional view showing the lens barrel of the lens unit shown in FIG. 本発明の別の実施形態に係るレンズユニットを示す断面図である。It is sectional drawing which shows the lens unit which concerns on another embodiment of this invention. 図５に示すレンズユニットの斜視図である。FIG. 6 is a perspective view of the lens unit shown in FIG. 5.

以下、本発明の実施形態について図面を参照して詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は本発明の一実施形態に係るレンズユニット１０を含むカメラ１００示している。このレンズユニット１０は樹脂製の鏡筒２と、この鏡筒２内に組み込まれた複数のレンズ１（第１レンズ１１〜第６レンズ１６）とから構成される。   FIG. 1 shows a camera 100 including a lens unit 10 according to an embodiment of the present invention. The lens unit 10 includes a resin-made lens barrel 2 and a plurality of lenses 1 (first lens 11 to sixth lens 16) incorporated in the lens barrel 2.

図２に示すように、複数のレンズ１は、第２レンズ１２〜第５レンズ１５（以下、中間レンズ群１ａという）と、この中間レンズ群１ａの光軸方向両側に配置される第１レンズ１１および第６レンズ１６（以下、それぞれを両末端レンズ１ｂという）とを含む。中間レンズ群１ａは鏡筒２内にそれぞれ圧入して組み込まれている。両末端レンズ１ｂは、それぞれ最も被写体（物体）側の第１レンズ１１および最も像面（センサー）側の第６レンズ１６を含み、リテーナ３により鏡筒２内に締結される。   As shown in FIG. 2, the plurality of lenses 1 includes a second lens 12 to a fifth lens 15 (hereinafter referred to as an intermediate lens group 1a) and a first lens disposed on both sides in the optical axis direction of the intermediate lens group 1a. 11 and the sixth lens 16 (hereinafter each referred to as a double-ended lens 1b). The intermediate lens group 1a is press-fitted into the lens barrel 2 and incorporated. Both end lenses 1 b include a first lens 11 closest to the subject (object) and a sixth lens 16 closest to the image plane (sensor), and are fastened in the lens barrel 2 by the retainer 3.

レンズ１の材質は特に限定されず、例えばガラスレンズ、薄肉ガラスレンズ、樹脂レンズなどが用いられ、用途に応じて適宜組み合わせて使用される。レンズ１の枚数、径、厚みなども鏡筒２に組み込むことが可能であればそれぞれ異なっていてもよい。   The material of the lens 1 is not specifically limited, For example, a glass lens, a thin glass lens, a resin lens etc. are used, It uses suitably combining according to a use. The number, diameter, thickness, etc. of the lenses 1 may be different from each other as long as they can be incorporated into the lens barrel 2.

鏡筒２は内部にレンズ１を収容する樹脂製の筒状部材であり、物体側および像面側の両末端に開口部を有する。   The lens barrel 2 is a resin-made cylindrical member that accommodates the lens 1 therein, and has openings at both ends on the object side and the image plane side.

鏡筒２は、使用環境温度範囲にてレンズを鏡筒に保持可能な必要最低限の圧入圧（光軸と直角方向にレンズに生じる圧力）をシミュレーションして設計されるのがよい。圧入圧は２０〜７０ＭＰａ、さらに好ましくは２０〜６０ＭＰａであるのがよい。圧入圧を設定することで、レンズ１へ与える悪影響が抑制され、線膨張係数の異なる硝材を使用することもできる。鏡筒２の使用環境温度範囲は−４０〜＋１０５℃、さらに好ましくは−４０〜＋１２５℃である。なお、この温度範囲はレンズ１を含む他の部材にも適用されてもよい。   The lens barrel 2 is preferably designed by simulating the minimum necessary press-fit pressure (pressure generated in the lens in the direction perpendicular to the optical axis) that can hold the lens in the lens barrel in the operating environment temperature range. The press-fitting pressure is 20 to 70 MPa, more preferably 20 to 60 MPa. By setting the press-fitting pressure, adverse effects on the lens 1 are suppressed, and glass materials having different linear expansion coefficients can be used. The operating environment temperature range of the lens barrel 2 is −40 to + 105 ° C., more preferably −40 to + 125 ° C. This temperature range may also be applied to other members including the lens 1.

このような鏡筒２は、射出成形（モールド成形）などによる成形の容易さ、軽さ、およびコストの点から樹脂製である。例えばポリカーボネート（ＰＣ）樹脂やポリフェチレンサルフェイド（ＰＰＳ）樹脂などがよい。特に、ＰＰＳ樹脂は、剛性や強度が高く、好適に使用される。また、より高強度、低線膨張にするために、例えばガラス繊維を樹脂中に混入してもよい。   The lens barrel 2 is made of resin from the viewpoint of ease of molding by injection molding (mold molding), lightness, and cost. For example, a polycarbonate (PC) resin or a polyphenylene sulfide (PPS) resin is preferable. In particular, PPS resin has high rigidity and strength and is preferably used. In order to obtain higher strength and lower linear expansion, for example, glass fibers may be mixed in the resin.

図２および図３に示すように、鏡筒２の端部には、レンズ１１およびレンズ１６がリテーナ３により装着される。リテーナ３は環状部材であり、鏡筒２の物体側および像面側の端部に光軸方向と平行に取り付けられ、鏡筒２の端部の第１レンズ１１、第６レンズ１６の両末端レンズ１ｂをそれぞれ鏡筒２に挟み込むように締結するものである。リテーナ３は、両末端レンズ１ｂを押さえるだけではなく、中間レンズ群１ａを鏡筒２の内側方向へ押さえてもよい。すなわち、両末端レンズ１ｂが当接する第２レンズ１２および第５レンズ１５を鏡筒２の内側方向へ押さえることができる。さらに、中間レンズ群１ａは、後述するように隣り合うレンズ同士が間隔環６に当接している場合、レンズ１全体を押さえることができる。   As shown in FIGS. 2 and 3, the lens 11 and the lens 16 are attached to the end of the lens barrel 2 by the retainer 3. The retainer 3 is an annular member, and is attached to the object side and image plane side ends of the lens barrel 2 in parallel with the optical axis direction, and both ends of the first lens 11 and the sixth lens 16 at the end of the lens barrel 2. The lens 1b is fastened so as to be sandwiched between the lens barrels 2 respectively. The retainer 3 may not only hold the both end lenses 1 b but also hold the intermediate lens group 1 a in the inner direction of the lens barrel 2. That is, the second lens 12 and the fifth lens 15 with which both end lenses 1b abut can be pressed toward the inner side of the lens barrel 2. Further, the intermediate lens group 1a can hold the entire lens 1 when adjacent lenses are in contact with the interval ring 6 as will be described later.

鏡筒２へのリテーナ３の締結方法は、締結するレンズにガタが生じなければ特に限定されず、例えばリテーナ３の内周面側および鏡筒２の両末端の外周面側にそれぞれネジを切って螺合する方法や、リテーナ３と鏡筒２とを嵌合させた後、外側からネジ（図示せず）でネジ止めする方法などが挙げられる。   The method of fastening the retainer 3 to the lens barrel 2 is not particularly limited as long as no looseness occurs in the lens to be fastened. For example, screws are cut on the inner peripheral surface side of the retainer 3 and the outer peripheral surface sides of both ends of the lens barrel 2. And a method in which the retainer 3 and the lens barrel 2 are fitted and then screwed with a screw (not shown) from the outside.

リテーナ３は、レンズユニットに対して環境温度変化に伴う線膨張を吸収し、安定した光軸方向の押圧力を付与するため弾性体で形成されているのがよい。このリテーナ３の弾性変形による応力で両末端レンズ１ｂを鏡筒２内へ押圧して、より確実に固定することができる。例えばアルミニウムなどの金属素材やＰＰＳなどの樹脂素材などが挙げられる。また、リテーナ３には、開口部側から内側へレンズ１１、１６を押圧するような押さえ部（例えば板バネ）などが設けられていてもよい。   The retainer 3 is preferably formed of an elastic body in order to absorb linear expansion accompanying a change in environmental temperature with respect to the lens unit and to apply a stable pressing force in the optical axis direction. The two end lenses 1b can be pressed into the lens barrel 2 by the stress caused by the elastic deformation of the retainer 3, and can be fixed more reliably. For example, a metal material such as aluminum or a resin material such as PPS can be used. Further, the retainer 3 may be provided with a pressing portion (for example, a leaf spring) that presses the lenses 11 and 16 inward from the opening side.

図３および図４に示すように、鏡筒２の内面のうち、圧入される中間レンズ群１ａが組み込まれる箇所の内周面は、圧入されるレンズを受けるための突出部５が設けられ、略円周面形状（多角形状）となっているのがよい。この突出部５は、圧入されたレンズ１の外径を保持するため、鏡筒２内に弦状（Ｄ字型）に突出している。突出部５の突出量は、絞り４で絞り込まれた光線を遮ることが無い程度の突出量であるのがよい。突出部５の突出方向の高さは０．１１５〜０．１０５ｍｍであり、その厚みはレンズのコバ以上であるのがよい。また、突出部５とレンズとの接触面積は大きい程よい。接触面積が大きいと応力が低くなり、レンズ保持が確実となり、小さいと応力が大きくなり突出部５が塑性変形してレンズガタが生じる恐れがある。。   As shown in FIGS. 3 and 4, the inner peripheral surface of the inner surface of the lens barrel 2 where the intermediate lens group 1a to be press-fitted is incorporated is provided with a protrusion 5 for receiving the press-fitted lens, It is good to have a substantially circumferential shape (polygonal shape). The protrusion 5 protrudes in a string shape (D shape) in the lens barrel 2 in order to maintain the outer diameter of the press-fit lens 1. The protruding amount of the protruding portion 5 is preferably a protruding amount that does not block the light beam narrowed by the stop 4. The height of the protruding portion 5 in the protruding direction is 0.115 to 0.105 mm, and the thickness is preferably equal to or greater than the edge of the lens. Further, the larger the contact area between the protrusion 5 and the lens, the better. If the contact area is large, the stress is low and lens holding is ensured. If the contact area is small, the stress is large, and the protrusion 5 may be plastically deformed to cause lens play. .

突出部５は、鏡筒２の内面の全周にわたって設ける必要はなく、レンズ１の外径を保持するために少なくとも１つあればよく、より好ましくは、内周面の突出部５同士の間に所定間隔を空けて設けるのがよい。例えば鏡筒２の内周を３等分や４等分するように、所定間隔を空けて３箇所や４箇所設けるのがよい。所定間隔を空けて突出部５を設ける場合、レンズ１の外周面と突出部５とが当接する状態であっても、レンズ１の外周面と鏡筒２の内周面との間に空気を通す隙間が生じる。そのため、隣り合うレンズ１同士の間が密閉された状態とならず、圧力を逃すことができ、鏡筒２の形状が変形するのをより抑制できる。   There is no need to provide the protrusions 5 over the entire circumference of the inner surface of the lens barrel 2, and at least one protrusion is sufficient to maintain the outer diameter of the lens 1, and more preferably, between the protrusions 5 on the inner peripheral surface. It is preferable to provide them at predetermined intervals. For example, it is preferable to provide three or four places at predetermined intervals so that the inner circumference of the lens barrel 2 is divided into three or four equal parts. In the case where the protrusions 5 are provided with a predetermined interval, even if the outer peripheral surface of the lens 1 and the protrusions 5 are in contact with each other, air is supplied between the outer peripheral surface of the lens 1 and the inner peripheral surface of the lens barrel 2. There is a gap through it. Therefore, the adjacent lenses 1 are not sealed, pressure can be released, and the shape of the lens barrel 2 can be further prevented from being deformed.

突出部５は、圧入される中間レンズ群１ａのレンズ毎に設けられ、レンズの径に応じて、形状や設置箇所が異なっていてもよい。また、突出部５は、鏡筒２と樹脂成形などで一体成形されていてもよいし、鏡筒２に別部材を取り付けてもよい。   The protrusion 5 is provided for each lens of the intermediate lens group 1a to be press-fitted, and the shape and installation location may be different depending on the diameter of the lens. The protruding portion 5 may be integrally formed with the lens barrel 2 by resin molding or the like, or another member may be attached to the lens barrel 2.

図４に示すように、鏡筒２は、中間レンズ群１ａが圧入される外周面がレンズの外径に対応して鏡筒２の厚みが異なり、肉厚部２ａと肉薄部２ｂとを有する。この肉薄部２ｂには、鏡筒２内周面に突出部５が形成された部位を含む領域の外周面に凹部８が形成される。凹部８は、突出部５が形成された部位を含む領域の鏡筒２の外周面を例えば肉抜きして設けることができる。この凹部８は、鏡筒２における突出部５の配置箇所と配置数に対応させるのがよい。   As shown in FIG. 4, the lens barrel 2 has a thick portion 2a and a thin portion 2b in which the outer peripheral surface into which the intermediate lens group 1a is press-fitted differs in thickness corresponding to the outer diameter of the lens. . In this thin portion 2b, a recess 8 is formed on the outer peripheral surface of the region including the portion where the protruding portion 5 is formed on the inner peripheral surface of the lens barrel 2. The concave portion 8 can be provided by, for example, removing the outer peripheral surface of the lens barrel 2 in the region including the portion where the protruding portion 5 is formed. The recesses 8 are preferably made to correspond to the locations and the number of the protrusions 5 in the lens barrel 2.

従来、鏡筒２に中間レンズ群１ａを圧入すると、鏡筒２の剛性が大きいため、鏡筒２の内径と圧入するレンズ１の外径との差によって、大きな応力が発生してしまう。しかしながら、凹部８を設けることで、レンズ収容箇所の鏡筒２の剛性を緩和してレンズ１の圧入圧を下げることができる。これにより、従来は圧入により大きな負荷が発生して、歪みが生じ光学性能が劣化していた樹脂レンズや薄肉ガラスレンズなどのレンズを、中間レンズ群１ａとして鏡筒２に圧入して使用することができる。   Conventionally, when the intermediate lens group 1a is press-fitted into the lens barrel 2, since the rigidity of the lens barrel 2 is large, a large stress is generated due to the difference between the inner diameter of the lens barrel 2 and the outer diameter of the lens 1 to be press-fitted. However, by providing the concave portion 8, it is possible to relax the rigidity of the lens barrel 2 at the lens housing location and reduce the press-fitting pressure of the lens 1. In this way, a lens such as a resin lens or a thin glass lens, which has conventionally been subjected to a large load due to press-fitting and has been distorted to deteriorate optical performance, is press-fitted into the lens barrel 2 as the intermediate lens group 1a. Can do.

鏡筒２は、上記した他にも基準位置９、間隔環６などを有していてもよい。   The lens barrel 2 may have a reference position 9 and a spacing ring 6 in addition to the above.

絞り４は、第２レンズ１２と第３レンズ１３との間に設けられ、所定の口径を開口させてレンズに入る光量を制御する薄板部材である。絞り４としては、透過光量を制限し、明るさの指標となるＦ値を決定する開口絞り、あるいはゴーストや収差の原因となる光線を遮光する遮光絞りがある。絞り４には間隔環６または第３レンズ１３が当接していてもよく、この事によりレンズ間隔の保持という効果がある。この絞り４の材質としては、耐久性などの点から金属製がよく、金属としては例えばステンレス鋼、アルミニウム等が挙げられ、ステンレス鋼であるのが好ましい。   The diaphragm 4 is a thin plate member that is provided between the second lens 12 and the third lens 13 and controls the amount of light entering the lens by opening a predetermined aperture. The stop 4 includes an aperture stop that limits the amount of transmitted light and determines an F value that is an index of brightness, or a light blocking stop that blocks light that causes ghosts and aberrations. The diaphragm 4 may be in contact with the interval ring 6 or the third lens 13, which has the effect of maintaining the lens interval. The material of the diaphragm 4 is preferably made of metal from the viewpoint of durability and the like, and examples of the metal include stainless steel and aluminum, and stainless steel is preferable.

基準位置９は、中間レンズ群１ａを鏡筒２に圧入する際、レンズの配置の基準となるもので、最初にレンズを配置するレンズ面の当接箇所を指す。本実施例では、この基準位置９は、鏡筒２の線膨張に対して、レンズ１の変化量と鏡筒２の変化量とを折り合いをつけるために、レンズ全体の略中間位置（第３レンズ１３と第４レンズ１４との間の位置）に設けるのがよい。基準位置９をレンズの略中間位置に設ける方が、絞り位置やレンズ全体の一方側に設けるよりもレンズユニット１０をコンパクト化できるという効果がある。なお、基準位置９はレンズの枚数や性能などに応じて適宜変更してもよいが、基準位置９を中心にした前後のレンズ枚数が同じ方が、歪みが発生しにくい。   The reference position 9 is a reference for lens arrangement when the intermediate lens group 1a is press-fitted into the lens barrel 2, and indicates a contact position of the lens surface where the lens is first arranged. In this embodiment, the reference position 9 is a substantially intermediate position (third position) of the entire lens in order to make a balance between the change amount of the lens 1 and the change amount of the lens barrel 2 with respect to the linear expansion of the lens barrel 2. It is preferable to provide it at a position between the lens 13 and the fourth lens 14. Providing the reference position 9 at a substantially intermediate position of the lens has an effect that the lens unit 10 can be made compact compared to providing the aperture position or one side of the entire lens. The reference position 9 may be appropriately changed according to the number and performance of the lenses, but distortion is less likely to occur when the number of lenses before and after the reference position 9 is the same.

図４に示すように、基準位置９は、鏡筒２内に、第３レンズ当接基準面９３と第４レンズ当接基準面９４とがそれぞれ像面側と物体側とに傾斜して屋根型に突出して形成される。この第３レンズ当接基準面９３および第４レンズ当接基準面９４に、それぞれ第３レンズ１３および第４レンズ１４が当接し適切な位置で保持される。この基準位置９の内周面は円形状となっている。第３レンズ当接基準面９３と第４レンズ当接基準面９４とが、それぞれ傾斜しているのは、撮像に影響が出てしまう内面反射を防止するためであり、また鏡筒２との一体成型時に金型を引き抜くのを容易にするためである。   As shown in FIG. 4, the reference position 9 is located in the lens barrel 2 with the third lens contact reference surface 93 and the fourth lens contact reference surface 94 inclined to the image surface side and the object side, respectively. It is formed protruding from the mold. The third lens 13 and the fourth lens 14 are in contact with the third lens contact reference surface 93 and the fourth lens contact reference surface 94, respectively, and are held at appropriate positions. The inner peripheral surface of the reference position 9 is circular. The reason why the third lens contact reference surface 93 and the fourth lens contact reference surface 94 are inclined is to prevent internal reflection that affects the imaging, and This is because it is easy to pull out the mold during integral molding.

基準位置９に基づいて、レンズユニットの基準温度（約２０℃）に対して、環境温度が低温側（−４０℃）から高温側（１２５℃）へ変化した場合に生じる、レンズ焦点距離変動と鏡筒２の膨張・収縮とを光学的に補償できるように光学設計を行う。このとき、基準位置９をレンズ全体の略中間位置に配置すると、物体側もしくは像面側端部に基準を設定するよりも、少ない変化量を考慮した補償設計が可能となる。そのため、レンズユニットの光学設計が容易となり、より安定した光学性能を得ることができる。例えば、鏡筒２に第１レンズ１１〜第６レンズ１６を設置する場合、まず、この基準位置９に、鏡筒２の物体側より第３レンズ１３を組み込み、像面側より第４レンズ１４を組み込む。次に、第１レンズ１１および第２レンズ１２を鏡筒２の物体側より、第５レンズ１５および第６レンズ１６を像面側より組み込むのがよい。このとき、第１レンズ１１および第２レンズ１２を含む負の屈折力を有する前群は、第３レンズ１３〜第６レンズ１６を含む正の屈折力を有する後群と、開口した絞り４を挟んで構成される。このように、レンズ全体で、前群と後群との光軸上長さに不均衡が生じる場合、レンズ全体の略中間位置に基準位置９を設けると、環境温度が変化した場合に生じる、レンズ焦点距離変動と鏡筒２の膨張・収縮とを光学的に補償でき、光学性能が安定する。一方、基準位置９が上記の条件を満たさない場合、光学的に補償できなくなることがあり、光学性能が悪化する場合がある。   Based on the reference position 9, the lens focal length variation caused when the environmental temperature changes from the low temperature side (−40 ° C.) to the high temperature side (125 ° C.) with respect to the reference temperature (about 20 ° C.) of the lens unit. Optical design is performed so that the expansion and contraction of the lens barrel 2 can be optically compensated. At this time, if the reference position 9 is arranged at a substantially intermediate position of the entire lens, it is possible to perform compensation design considering a smaller amount of change than setting the reference at the object side or the image side end. Therefore, the optical design of the lens unit is facilitated, and more stable optical performance can be obtained. For example, when the first lens 11 to the sixth lens 16 are installed in the lens barrel 2, first, the third lens 13 is first incorporated into the reference position 9 from the object side of the lens barrel 2, and the fourth lens 14 from the image plane side. Incorporate Next, it is preferable to incorporate the first lens 11 and the second lens 12 from the object side of the lens barrel 2 and the fifth lens 15 and the sixth lens 16 from the image plane side. At this time, the front group having negative refractive power including the first lens 11 and the second lens 12 includes the rear group having positive refractive power including the third lens 13 to the sixth lens 16, and the aperture stop 4 that is opened. It is composed of sandwiches. As described above, when an imbalance occurs in the length on the optical axis between the front group and the rear group in the entire lens, if the reference position 9 is provided at a substantially intermediate position of the entire lens, it occurs when the environmental temperature changes. The lens focal length variation and the expansion / contraction of the lens barrel 2 can be optically compensated, and the optical performance is stabilized. On the other hand, if the reference position 9 does not satisfy the above conditions, optical compensation may not be possible, and optical performance may deteriorate.

間隔を空けて配置される第２レンズ１２と第３レンズ１３、第４レンズ１４と第５レンズ１５間には、それぞれ隣り合うレンズ同士の間隔を保持するための間隔環６が設けられていてもよい。間隔環６は鏡筒２内に配置される部材であり、鏡筒２と一体成型されていてもよいし、別部材であってもよい。この間隔環６の外周面は鏡筒２の内周面と当接する。間隔環６は温度変化に対する変化量が少なく、且つ剛性が大きくなることから、金属で形成するのがよい。金属製の間隔環６は、広い温度領域において安定した光学性能を確保することができる。このような間隔環６の材質としては、例えばアルミニウム、チタン、マグネシウム、ステンレス鋼等、またはそれらを主成分とする合金等が挙げられ、特にアルミニウムが軽量化と低コストの面から好ましい。なお、第２レンズ１２および第３レンズ１３間では、この間隔環６と第３レンズ１３間に絞り４が設けられている。   An interval ring 6 is provided between the second lens 12 and the third lens 13 and the fourth lens 14 and the fifth lens 15 that are arranged with a space between them to maintain the distance between adjacent lenses. Also good. The spacing ring 6 is a member disposed in the lens barrel 2 and may be integrally formed with the lens barrel 2 or may be a separate member. The outer peripheral surface of the spacing ring 6 is in contact with the inner peripheral surface of the lens barrel 2. The spacing ring 6 is preferably made of metal because the amount of change with respect to temperature change is small and the rigidity is increased. The metal spacing ring 6 can ensure stable optical performance in a wide temperature range. Examples of the material of the spacing ring 6 include aluminum, titanium, magnesium, stainless steel, and alloys thereof, and the like. Aluminum is particularly preferable from the viewpoint of weight reduction and low cost. A diaphragm 4 is provided between the second lens 12 and the third lens 13 between the spacing ring 6 and the third lens 13.

第５レンズ１５および第６レンズ１６は、接合されたレンズ（以下、接合レンズという）であってもよい。接合レンズは温度変化に伴う光軸方向の応力が接合面に作用しないように、第６レンズ１６より小径の第５レンズ１５を物体側に配置して保護するのがよい。また、第５レンズ１５および第６レンズ１６を貼り合わせることで、色収差の発生を改善すると共に、レンズ枚数が増えた場合であってもレンズ組み込み時に発生するズレの影響を小さく、つまり組み込み感度がより低くなるよう設計することができる。この接合レンズと第４レンズ１４とは、間隔環６にて間隔規定されているのがよい。   The fifth lens 15 and the sixth lens 16 may be a cemented lens (hereinafter referred to as a cemented lens). The cemented lens is preferably protected by disposing a fifth lens 15 having a smaller diameter than the sixth lens 16 on the object side so that stress in the optical axis direction due to temperature change does not act on the cemented surface. In addition, the fifth lens 15 and the sixth lens 16 are bonded together to improve the occurrence of chromatic aberration, and even when the number of lenses is increased, the influence of the deviation that occurs when the lenses are incorporated is reduced, that is, the sensitivity of incorporation is reduced. It can be designed to be lower. The cemented lens and the fourth lens 14 are preferably defined by a spacing ring 6.

以上の本発明の説明では、５群６枚構成の光学系を例に説明したが、レンズ枚数や構成については限定されるものではなく、用途に応じて適宜変更可能である。   In the above description of the present invention, an optical system having a five-group, six-element configuration has been described as an example. However, the number of lenses and the configuration are not limited, and can be appropriately changed according to the application.

（実施例）
これまでの説明では、５群６枚の光学系をベースに説明したが、本実施例では、図５および図６に示すような、７群７枚のレンズ７（第１レンズ７１〜第７レンズ７７）および鏡筒２０を用いたレンズユニット１１０を使用して、レンズおよび鏡筒にかかる応力の負荷のシミュレーションを実施した。また本実施例における組み込み基準位置９は、第２レンズ７２と第３レンズ７３の間に設定した。 (Example)
In the description so far, the description has been based on the optical system of 6 elements in 5 groups. However, in this embodiment, 7 lenses in 7 groups (first lens 71 to 7 as shown in FIGS. 5 and 6). The lens unit 110 using the lens 77) and the lens barrel 20 was used to simulate the stress load applied to the lens and the lens barrel. Further, the incorporation reference position 9 in this embodiment is set between the second lens 72 and the third lens 73.

実施例として、図５および図６に示すレンズユニット１１０を用意した。レンズユニット１１０の７枚のレンズ７１〜７７は、鏡筒２０内に圧入される第２レンズ７２〜第６レンズ７６（以下、中間レンズ群７ａという）と、鏡筒２０の両末端に締結される最も物体側の第１レンズ７１および最もイメージセンサー９９側（像面側）の第７レンズ７７（以下、両末端レンズ７ｂという）とを含む。中間レンズ群７ａは、鏡筒２０内にそれぞれ圧入して組み込まれ、鏡筒２０内の弦状の突出部５で外径を保持される。中間レンズ群７ａの各レンズ間には、レンズ同士の間隔を保持するための間隔環６が設置される。また、第２レンズ７２の後端に設けられた間隔環６の後端には絞り４が設置される。鏡筒２０の内周面には、鏡筒２０の両端部よりレンズ７を組み込む際に、レンズ７全体の略中間位置に、組み込まれたレンズ７の一方の面の周縁が当接する基準位置となる突出部分が形成されている。本実施例では、第２レンズ７２および第３レンズ７３の間に形成した突出部分が基準位置９である。この基準位置９に対して、第２レンズ７２の像面側周縁が、間隔環６および絞り４を介して押圧され、第３レンズ７３の物体側周縁は直接当接して、それぞれ位置付けられている。一方、両末端レンズ７ｂは鏡筒２０の両末端にそれぞれリテーナ３で挟み込んで締結される。鏡筒２０は物体側から像面側へかけて厚みが厚くなっており、肉厚部２０ａと肉薄部２０ｂとを有する。   As an example, a lens unit 110 shown in FIGS. 5 and 6 was prepared. The seven lenses 71 to 77 of the lens unit 110 are fastened to the second lens 72 to the sixth lens 76 (hereinafter referred to as the intermediate lens group 7 a) press-fitted into the lens barrel 20 and both ends of the lens barrel 20. A first lens 71 closest to the object side and a seventh lens 77 closest to the image sensor 99 (image surface side) (hereinafter referred to as a double-ended lens 7b). The intermediate lens group 7 a is respectively press-fitted and incorporated into the lens barrel 20, and the outer diameter is held by the string-like projecting portion 5 in the lens barrel 20. A spacing ring 6 is provided between the lenses of the intermediate lens group 7a to maintain the spacing between the lenses. A diaphragm 4 is installed at the rear end of the spacing ring 6 provided at the rear end of the second lens 72. When the lens 7 is assembled from both ends of the lens barrel 20 on the inner peripheral surface of the lens barrel 20, a reference position where the peripheral edge of one surface of the lens 7 is brought into contact with a substantially intermediate position of the entire lens 7. A protruding portion is formed. In the present embodiment, the protruding portion formed between the second lens 72 and the third lens 73 is the reference position 9. The image surface side peripheral edge of the second lens 72 is pressed against the reference position 9 via the interval ring 6 and the diaphragm 4, and the object side peripheral edge of the third lens 73 is directly in contact with the reference position 9. . On the other hand, the both end lenses 7 b are fastened by being sandwiched by the retainers 3 at both ends of the lens barrel 20. The lens barrel 20 increases in thickness from the object side to the image plane side, and has a thick portion 20a and a thin portion 20b.

レンズ７を鏡筒２０に取り付ける際、変形量（圧入量）がそれぞれ０．０１５ｍｍになるよう応力を負荷した。実施例においてレンズ７としては光学ガラスレンズ、鏡筒２０は材質がＰＰＳ樹脂であり、内面に突出部５を一体成型した。また、リテーナ３は材質がＰＰＳ樹脂、間隔環６は材質がアルミ合金であった。また、レンズ７の各径、レンズ７の鏡筒２の内周面および突出部５への各接触面積は表１に示す通りである。ここで、接触面積とは、レンズ７の外周部（コバ）が突出部５に圧入された部分の面積を意味し、レンズ７の外径やレンズコバの肉厚によって異なっている。   When the lens 7 was attached to the lens barrel 20, a stress was applied so that the deformation amount (press fit amount) was 0.015 mm. In the embodiment, the lens 7 is an optical glass lens, and the lens barrel 20 is made of PPS resin, and the protrusion 5 is integrally formed on the inner surface. The retainer 3 is made of PPS resin, and the spacing ring 6 is made of aluminum alloy. Further, each diameter of the lens 7 and each contact area of the lens 7 to the inner peripheral surface of the lens barrel 2 and the protruding portion 5 are as shown in Table 1. Here, the contact area means the area of the portion where the outer peripheral portion (edge) of the lens 7 is press-fitted into the protruding portion 5, and differs depending on the outer diameter of the lens 7 and the thickness of the lens edge.

鏡筒２０の外周面には図６に示すように、内周面に突出部５が形成された肉薄部２０ｂを含む領域形成されている。この領域に形成した凹部８は、鏡筒２０の内部に圧入されるレンズ７の外径の相違による圧入量を制御するためのもので、内周面に突出部５が形成された部位を含む領域の外周面に、レンズ７の外径に合わせて他の鏡筒２の外周面（肉厚部２０ａ）より厚みが０．７５〜０．８５ｍｍ薄くなるように肉薄部２０ｂに前後に３箇所の肉抜きを、鏡筒２０の周方向にそれぞれ３箇所行い形成した。その結果を表１に示す。   As shown in FIG. 6, a region including a thin portion 20 b in which the protruding portion 5 is formed on the inner peripheral surface is formed on the outer peripheral surface of the lens barrel 20. The concave portion 8 formed in this region is for controlling the press-fitting amount due to the difference in the outer diameter of the lens 7 press-fitted into the lens barrel 20, and includes a portion where the protruding portion 5 is formed on the inner peripheral surface. Three locations on the outer peripheral surface of the region are arranged at the front and rear of the thin portion 20b so that the thickness is 0.75 to 0.85 mm thinner than the outer peripheral surface (thick portion 20a) of the other lens barrel 2 according to the outer diameter of the lens 7. Are formed at three locations in the circumferential direction of the lens barrel 20. The results are shown in Table 1.

Figure 2019179179
Figure 2019179179

実施例のレンズユニットは、レンズ圧入時に、共にレンズおよび鏡筒にかかる応力を低減したため、レンズや鏡筒の破壊や破損は起こらなかった。
さらに、表１に示すように、突出部５の外周面の肉薄部２０ｂに凹部８を設けたことで、肉薄部２０ｂがより薄肉構造となってレンズ収容部における鏡筒２０の剛性が下がる。そのため、鏡筒２０に圧入された中間レンズ群７ａの接地面積あたりの力が抑制され、レンズ７にかかる力のばらつきをより抑制できることがわかった。 In the lens unit of the example, the stress applied to the lens and the lens barrel was reduced when the lens was press-fitted, so that the lens and the lens barrel were not broken or damaged.
Furthermore, as shown in Table 1, by providing the recessed portion 8 in the thin portion 20b on the outer peripheral surface of the protruding portion 5, the thin portion 20b has a thinner structure, and the rigidity of the lens barrel 20 in the lens housing portion is reduced. Therefore, it was found that the force per contact area of the intermediate lens group 7a press-fitted into the lens barrel 20 is suppressed, and variation in the force applied to the lens 7 can be further suppressed.

以上、本発明の実施形態に係るレンズユニットを説明したが、本発明は上記実施形態に限定されるものではなく、種々の改善や改良が可能である。例えば、本発明のレンズユニットは、耐振動性だけではなく温度変化に対しても鏡筒とレンズとの間にガタが生じないため、車載カメラ等だけではなく、例えばスキャナやプロジェクタなど、光源からの熱でレンズや鏡筒に大きな温度変化が生じる機器にも好適に用いることができる。   The lens unit according to the embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and various improvements and improvements can be made. For example, the lens unit of the present invention is not limited to vibration resistance, and does not generate backlash between the lens barrel and the lens even with respect to temperature changes. It can also be suitably used for equipment in which a large temperature change occurs in the lens or the lens barrel due to the heat.

１ レンズ
１ａ 中間レンズ群
１ｂ 両末端レンズ
２ 鏡筒
２ａ 肉厚部
２ｂ 肉薄部
３ リテーナ
４ 絞り
５ 突出部
６ 間隔環
８ 凹部
９ 基準位置
１０ レンズユニット
７ レンズ
７ａ 中間レンズ群
７ｂ 両末端レンズ
２０ 鏡筒
１００ カメラ
１１０ レンズユニット DESCRIPTION OF SYMBOLS 1 Lens 1a Intermediate lens group 1b Both end lens 2 Lens barrel 2a Thick part 2b Thin part 3 Retainer 4 Diaphragm 5 Projection part 6 Space ring 8 Concave part 9 Reference position 10 Lens unit 7 Lens 7a Intermediate lens group 7b Both end lens 20 Mirror Tube 100 Camera 110 Lens unit

Claims (6)

複数のレンズが樹脂製の鏡筒内に組み込まれたレンズユニットであって、
前記複数のレンズが、前記鏡筒内に圧入された中間レンズ群と、この中間レンズ群の光軸方向両側に配置され、リテーナにより前記鏡筒内に締結された両末端レンズと、を含むことを特徴とするレンズユニット。 A lens unit in which a plurality of lenses are incorporated in a resin lens barrel,
The plurality of lenses includes an intermediate lens group press-fitted into the lens barrel, and both end lenses disposed on both sides in the optical axis direction of the intermediate lens group and fastened in the lens barrel by a retainer. Lens unit characterized by 前記リテーナが弾性体で構成されている請求項１記載のレンズユニット。   The lens unit according to claim 1, wherein the retainer is made of an elastic body. 前記鏡筒の内周面には、鏡筒内に弦状に突出し、組み込まれた中間レンズ群が圧入される少なくとも１つの突出部が形成されている請求項１または２に記載のレンズユニット。   3. The lens unit according to claim 1, wherein at least one projecting portion is formed on an inner peripheral surface of the lens barrel so as to project into a string shape in the lens barrel and into which the incorporated intermediate lens group is press-fitted. 前記鏡筒は、肉厚部と肉薄部とを有し、
前記肉薄部には、内周面に前記突出部が形成された部位を含む領域の外周面に凹部が形成されている請求項３に記載のレンズユニット。 The lens barrel has a thick part and a thin part,
The lens unit according to claim 3, wherein the thin portion has a recess formed on an outer peripheral surface of a region including a portion where the protruding portion is formed on an inner peripheral surface. 前記突出部が、前記鏡筒の内周面に所定間隔で形成される請求項３または４に記載のレンズユニット。   The lens unit according to claim 3 or 4, wherein the protrusions are formed at predetermined intervals on an inner peripheral surface of the lens barrel. 前記鏡筒の内周面には、鏡筒両端部よりレンズを組み込む際にレンズの一方の面の周縁が当接する基準位置となる突出部が形成されている請求項３から５のいずれかに記載のレンズユニット。   6. The projection according to any one of claims 3 to 5, wherein an inner peripheral surface of the lens barrel is formed with a projecting portion serving as a reference position with which a peripheral edge of one surface of the lens contacts when the lens is assembled from both ends of the lens barrel. The lens unit described.
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WO2021097882A1 (en) * 2019-11-19 2021-05-27 诚瑞光学(常州)股份有限公司 Lens module and electronic device
JP7446859B2 (en) 2020-03-05 2024-03-11 株式会社タムロン lens unit
JP7514634B2 (en) 2020-03-05 2024-07-11 株式会社タムロン Lens unit

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JP2002250852A (en) * 2001-02-22 2002-09-06 Ricoh Co Ltd Lens unit, read-out lens block, image read-out device, and method for keeping relative position of lens elements
JP2007057795A (en) * 2005-08-24 2007-03-08 Tamron Co Ltd Lens-fixing device and lens barrel using the same
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021097882A1 (en) * 2019-11-19 2021-05-27 诚瑞光学(常州)股份有限公司 Lens module and electronic device
JP7446859B2 (en) 2020-03-05 2024-03-11 株式会社タムロン lens unit
JP7514634B2 (en) 2020-03-05 2024-07-11 株式会社タムロン Lens unit

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