JP2015025974A - Lens unit and imaging apparatus - Google Patents

Lens unit and imaging apparatus Download PDF

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JP2015025974A
JP2015025974A JP2013156090A JP2013156090A JP2015025974A JP 2015025974 A JP2015025974 A JP 2015025974A JP 2013156090 A JP2013156090 A JP 2013156090A JP 2013156090 A JP2013156090 A JP 2013156090A JP 2015025974 A JP2015025974 A JP 2015025974A
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lens
unit
lens unit
buffer
lens frame
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JP6182380B2 (en
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直人 大原
Naoto Ohara
直人 大原
理洋 森島
Michihiro Morishima
理洋 森島
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Kyocera Corp
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Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of distortion on a curve surface in a wide temperature range.SOLUTION: A lens unit 11 comprises a lens part 16, a lens frame part 15, and a buffer part 17. The lens frame part 15 holds the lens part 16. The buffer part 17 has a Young's modulus smaller than that of the lens part 16. The buffer part 17 is placed between an outer periphery of the lens part 16 and an inner periphery of the lens frame part 15.

Description

本発明は、広い温度領域において使用可能なレンズユニットおよび撮像装置に関する。   The present invention relates to a lens unit and an imaging apparatus that can be used in a wide temperature range.

車載カメラおよび監視カメラなどのように、屋外環境に曝される頻度の高いカメラが知られている。このような屋外向けのカメラには、低温から高温まで広い温度領域において、光学性能などの撮影のための多様な性能を維持することが求められる。   There are known cameras that are frequently exposed to the outdoor environment, such as in-vehicle cameras and surveillance cameras. Such an outdoor camera is required to maintain various performances for photographing such as optical performance in a wide temperature range from low temperature to high temperature.

光学性能を維持するためには、温度変化に対して、鏡枠に保持されるレンズの偏心を抑制することが重要である。偏心の抑制のために、鏡枠の開口および当該開口に係合するレンズの外周周辺を互いに係合するテーパ状に形成し、レンズを弾性部材によって開口側に付勢する構成体が提案されている（特許文献１参照）。   In order to maintain the optical performance, it is important to suppress the eccentricity of the lens held in the lens frame with respect to the temperature change. In order to suppress eccentricity, a structure has been proposed in which the opening of the lens frame and the outer periphery of the lens that engages with the opening are formed into a tapered shape that engages with each other, and the lens is biased toward the opening by an elastic member. (See Patent Document 1).

特開２００７−１７８５４１号公報JP 2007-178541 A

しかし、特許文献１に記載の構成体では偏心そのものを抑制可能であるが、鏡枠およびレンズの線膨張係数の違いから、高温の使用環境においてレンズの径方向の膨張が抑制されることに起因して、レンズの曲面に歪みが生じ得る。レンズの曲面に歪みが生じることにより、光学性能の低下およびレンズ表面に施したコーティングにクラックを発生し得る。   However, although the eccentricity itself can be suppressed in the structure described in Patent Document 1, due to the difference in the linear expansion coefficient between the lens frame and the lens, the expansion in the radial direction of the lens is suppressed in a high temperature use environment. Thus, distortion may occur on the curved surface of the lens. Due to distortion in the curved surface of the lens, optical performance can be degraded and cracks can occur in the coating applied to the lens surface.

したがって、かかる事情に鑑みてなされた本発明の目的は、広い温度領域でレンズの曲面における歪みの発生を抑制するレンズユニットおよび撮像装置を提供することにある。   Accordingly, an object of the present invention made in view of such circumstances is to provide a lens unit and an imaging apparatus that suppress the occurrence of distortion on the curved surface of the lens in a wide temperature range.

上述した諸課題を解決すべく、第１の観点によるレンズユニットは、
レンズ部と、
前記レンズ部を保持する鏡枠部と、
前記レンズ部よりもヤング率が小さく、前記レンズ部の外周および前記鏡枠部の内周の間に配置される緩衝部とを備える
ことを特徴とするものである。 In order to solve the above-described problems, the lens unit according to the first aspect is
The lens part,
A lens frame part for holding the lens part;
A Young's modulus is smaller than that of the lens unit, and a buffer unit disposed between the outer periphery of the lens unit and the inner periphery of the lens frame unit is provided.

また、第２の観点によるレンズユニットにおいて、
前記緩衝部の線膨張係数は、前記レンズ部の線膨張係数より小さく且つ前記鏡枠部の線膨張係数より大きい
ことが好ましい。 In the lens unit according to the second aspect,
The linear expansion coefficient of the buffer portion is preferably smaller than the linear expansion coefficient of the lens portion and larger than the linear expansion coefficient of the lens frame portion.

また、第３の観点によるレンズユニットは、
レンズ部と、
前記レンズ部を保持する鏡枠部と、
前記レンズ部よりも線膨張係数が小さく且つ前記鏡枠部よりも線膨張係数が大きく、前記レンズ部の外周および前記鏡枠部の内周の間に配置される緩衝部とを備える
ことを特徴とするものである。 The lens unit according to the third aspect is
The lens part,
A lens frame part for holding the lens part;
A linear expansion coefficient is smaller than that of the lens unit and a linear expansion coefficient is larger than that of the lens frame unit, and a buffer unit is provided between the outer periphery of the lens unit and the inner periphery of the lens frame unit. It is what.

また、第４の観点によるレンズユニットにおいて、
前記レンズユニットは、少なくとも常温の温度領域および高温の温度領域において使用されることが想定され、
前記鏡枠部の前記常温の温度領域内の第１の温度における内径をφ１、前記レンズ部の前記第１の温度における外径をφ２、前記鏡枠部の線膨張係数をα１、前記レンズ部の線膨張係数をα２、前記高温の温度領域内の第２の温度と前記第１の温度の差分をΔＴとするとき、
α２＞α１
φ１＞φ２+φ２×α２×ΔＴ
を満たす
ことが好ましい。 In the lens unit according to the fourth aspect,
The lens unit is assumed to be used at least in a normal temperature range and a high temperature range,
The inner diameter of the lens frame portion at a first temperature within the normal temperature range is φ1, the outer diameter of the lens portion at the first temperature is φ2, the linear expansion coefficient of the lens frame portion is α1, and the lens portion When the linear expansion coefficient is α2, and the difference between the second temperature in the high temperature region and the first temperature is ΔT,
α2> α1
φ1> φ2 + φ2 × α2 × ΔT
It is preferable to satisfy

また、第５の観点によるレンズユニットにおいて、
前記緩衝部の前記鏡枠部への組込み、および前記レンズ部の前記緩衝部への組込みの少なくとも一方が、圧入による
ことが好ましい。 In the lens unit according to the fifth aspect,
It is preferable that at least one of the incorporation of the buffer portion into the lens frame portion and the incorporation of the lens portion into the buffer portion is by press-fitting.

また、第６の観点による撮像装置は、
レンズ部と、前記レンズ部を保持する鏡枠部と、前記レンズ部よりもヤング率が小さく、前記レンズ部の外周および前記鏡枠部の内周の間に配置される緩衝部とを有するレンズユニットを備える
ことを特徴としている。 An imaging device according to a sixth aspect is
A lens having a lens unit, a lens frame unit that holds the lens unit, and a buffer unit that has a Young's modulus smaller than that of the lens unit and is disposed between the outer periphery of the lens unit and the inner periphery of the lens frame unit It is characterized by having a unit.

上記のように構成された本発明に係るレンズユニットおよび撮像装置によれば、広い温度領域において曲面における歪みの発生を抑制可能である。   According to the lens unit and the imaging device according to the present invention configured as described above, it is possible to suppress the occurrence of distortion on the curved surface in a wide temperature range.

本発明の一実施形態に係るレンズユニットを有する撮像装置の概略構成を示す機能ブロック図である。1 is a functional block diagram illustrating a schematic configuration of an imaging apparatus having a lens unit according to an embodiment of the present invention. 図１におけるレンズユニットの、光軸に沿った断面図である。It is sectional drawing along the optical axis of the lens unit in FIG. 緩衝部を有さないレンズユニットにおいて曲面に歪みが生じる作用を説明するための、光軸に沿った断面図である。It is sectional drawing along an optical axis for demonstrating the effect | action which a distortion arises in a curved surface in the lens unit which does not have a buffer part.

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

まず、本発明の一実施形態に係るレンズユニットを有する撮像装置について説明する。撮像装置は、例えば車載用カメラおよび監視カメラなどのように低温の温度領域、常温の温度領域、および高温の温度領域を含む、広い温度領域で使用されるカメラである。低温の温度領域とは、例えば−４０℃から０℃である。常温の温度領域とは、例えば０℃から４０℃である。高温の温度領域とは、例えば４０℃から８０℃である。   First, an imaging apparatus having a lens unit according to an embodiment of the present invention will be described. The imaging device is a camera that is used in a wide temperature range including a low temperature range, a normal temperature range, and a high temperature range, such as an in-vehicle camera and a surveillance camera. The low temperature range is, for example, −40 ° C. to 0 ° C. The normal temperature range is, for example, 0 ° C. to 40 ° C. The high temperature range is, for example, 40 ° C. to 80 ° C.

図１に示すように、撮像装置１０は、レンズユニット１１、撮像素子１２、ＡＦＥ（アナログフロントエンド）１３、Ｉ／Ｆ（インターフェース）１４を含んで構成される。レンズユニット１１は被写体の光学像を結像させる。撮像素子１２は結像した光学像を撮像し、光学像に相当する画像信号を生成する。ＡＦＥ１３は画像信号にＣＤＳ／ＳＨ処理およびＡＤ変換処理を施す。Ｉ／Ｆ１４はＡＦＥ１３により所定の処理が施された画像信号を、撮像装置１０の外部機器、例えば表示装置および記憶装置などに出力する。本実施形態において、撮像装置１０は外部機器に対して画像信号を出力する構成であるが、撮像装置１０自身がディスプレイを有し、画像信号に相当する画像を表示してもよい。また、撮像装置１０自身がメモリを有し、画像信号を記憶してもよい。   As shown in FIG. 1, the imaging apparatus 10 includes a lens unit 11, an imaging element 12, an AFE (analog front end) 13, and an I / F (interface) 14. The lens unit 11 forms an optical image of the subject. The image sensor 12 captures the formed optical image and generates an image signal corresponding to the optical image. The AFE 13 performs CDS / SH processing and AD conversion processing on the image signal. The I / F 14 outputs an image signal that has been subjected to predetermined processing by the AFE 13 to an external device of the imaging device 10, such as a display device and a storage device. In the present embodiment, the imaging device 10 is configured to output an image signal to an external device, but the imaging device 10 itself may have a display and display an image corresponding to the image signal. Further, the imaging device 10 itself may have a memory and store an image signal.

次に、レンズユニット１１の構成について詳細に説明する。図２に示すように、レンズユニット１１は、鏡枠部１５、少なくとも一つのレンズ部１６、および緩衝部１７を含んで構成される。   Next, the configuration of the lens unit 11 will be described in detail. As shown in FIG. 2, the lens unit 11 includes a lens frame unit 15, at least one lens unit 16, and a buffer unit 17.

鏡枠部１５は金属などの硬質の材料によって、円筒形状に形成される。鏡枠部１５は、円筒内周にレンズ部１６を保持する。   The lens frame portion 15 is formed in a cylindrical shape by a hard material such as metal. The lens frame portion 15 holds the lens portion 16 on the inner periphery of the cylinder.

レンズ部１６は、線膨張係数が鏡枠部１５の線膨張係数より大きく、ヤング率として表される硬さが鏡枠部１５の硬さより低い材料によって形成される。すなわち、鏡枠部１５およびレンズ部１６の線膨張係数をそれぞれα１、α２とすると、α２＞α１である。また、鏡枠部１５およびレンズ部１６のヤング率をそれぞれＥ１、Ｅ２とすると、Ｅ１＞Ｅ２である。また、常温の温度領域内の第１の温度と高温の温度領域内の第２の温度との差分をΔＴ、第１の温度における鏡枠部１５の円筒内径をφ１、第１の温度におけるレンズ部１６の外径をφ２とすると、φ１＞φ２＋φ２×α２×ΔＴを満たすように、レンズ部１６は形成される。第１の温度は、使用が想定される環境において、常温の温度領域内で頻度が大きいと想定される温度である。第２の温度は、使用が想定される環境において、高温の温度領域内で頻度が大きいと想定される温度である。また、レンズ部１６においては、レンズユニット１１として所望の光学性能、例えば焦点距離および被写界深度などを満たすように、曲面が形成される。レンズ部１６は、後述する緩衝部１７を介して、鏡枠部１５に保持される。   The lens portion 16 is formed of a material having a linear expansion coefficient larger than that of the lens frame portion 15 and a hardness expressed as Young's modulus lower than that of the lens frame portion 15. That is, when the linear expansion coefficients of the lens frame portion 15 and the lens portion 16 are α1 and α2, respectively, α2> α1. When the Young's moduli of the lens frame portion 15 and the lens portion 16 are E1 and E2, respectively, E1> E2. Further, the difference between the first temperature in the normal temperature range and the second temperature in the high temperature range is ΔT, the cylindrical inner diameter of the lens barrel 15 at the first temperature is φ1, and the lens at the first temperature. When the outer diameter of the portion 16 is φ2, the lens portion 16 is formed so as to satisfy φ1> φ2 + φ2 × α2 × ΔT. The first temperature is a temperature that is assumed to have a high frequency within a normal temperature range in an environment where use is assumed. The second temperature is a temperature that is assumed to have a high frequency within a high temperature range in an environment where use is assumed. In the lens unit 16, a curved surface is formed so as to satisfy desired optical performance as the lens unit 11, such as a focal length and a depth of field. The lens unit 16 is held by the lens frame unit 15 via a buffer unit 17 described later.

緩衝部１７は、線膨張係数が鏡枠部１５の線膨張係数より大きく且つレンズ部１６の線膨張係数より小さく、ヤング率として表される硬さがレンズ部１６の硬さより小さい材料によって形成される。すなわち、緩衝部１７の線膨張係数およびヤング率をそれぞれα３、Ｅ３とすると、Ｅ１＞Ｅ２＞Ｅ３であり、α２＞α３＞α１である。また、緩衝部１７は、第１の温度において、内径がレンズ部１６の外径より僅かに小さく、外径が鏡枠部１５の内径より僅かに大きな、環状である。緩衝部１７は、鏡枠部１５の円筒内周およびレンズ部の外周の間に配置される。   The buffer portion 17 is formed of a material whose linear expansion coefficient is larger than the linear expansion coefficient of the lens frame portion 15 and smaller than the linear expansion coefficient of the lens portion 16 and whose hardness expressed as Young's modulus is smaller than the hardness of the lens portion 16. The That is, if the linear expansion coefficient and the Young's modulus of the buffer portion 17 are α3 and E3, respectively, E1> E2> E3 and α2> α3> α1. Further, the buffer portion 17 has an annular shape whose inner diameter is slightly smaller than the outer diameter of the lens portion 16 and whose outer diameter is slightly larger than the inner diameter of the lens frame portion 15 at the first temperature. The buffer portion 17 is disposed between the inner circumference of the lens barrel portion 15 and the outer circumference of the lens portion.

緩衝部１７は、圧入により鏡枠部１５内に組込まれる。または、緩衝部１７は、鏡枠部１５内に、例えば二色成型により一体的に形成されていてもよい。または、緩衝部１７は、レンズ部１６の周方向に沿って液状ガスケットを塗布した状態で鏡枠部１５内に組込み後、湿気硬化させることにより、形成されてもよい。レンズ部１６は、圧入により緩衝部１７内に組込まれる。または、レンズ部１６は、緩衝部１７内に、二色成型により一体的に形成されていてもよい。   The buffer part 17 is assembled in the lens frame part 15 by press-fitting. Alternatively, the buffer portion 17 may be integrally formed in the lens frame portion 15 by, for example, two-color molding. Alternatively, the buffer portion 17 may be formed by moisture curing after being incorporated into the lens frame portion 15 in a state where a liquid gasket is applied along the circumferential direction of the lens portion 16. The lens unit 16 is assembled into the buffer unit 17 by press-fitting. Alternatively, the lens unit 16 may be integrally formed in the buffer unit 17 by two-color molding.

以上のような構成の本実施形態のレンズユニットによれば、緩衝部１７を介してレンズ部１６を鏡枠部１５内に保持するので、高温の温度領域下におけるレンズ部１６の曲面における歪みの発生を抑制可能である。以下に、歪みの発生の抑制作用について詳細に説明する。   According to the lens unit of the present embodiment configured as described above, since the lens unit 16 is held in the lens frame unit 15 via the buffer unit 17, distortion on the curved surface of the lens unit 16 under a high temperature range is prevented. Occurrence can be suppressed. Hereinafter, the effect of suppressing the occurrence of distortion will be described in detail.

レンズ部１６は高温の温度領域において全方向に膨張する。レンズ部１６’が直接鏡枠部１５’内に組込まれる場合には、レンズ部１６’よりも線膨張係数の小さな鏡枠部１５’によって径方向の膨張が抑制され、レンズ部１６’の厚さ方向に偏って膨張し得る（図３参照）。レンズ部１６’の厚さ方向に偏った膨張により、前述のように、レンズ部１６’の曲面に歪みが生じる。   The lens unit 16 expands in all directions in a high temperature range. When the lens portion 16 ′ is directly incorporated in the lens frame portion 15 ′, expansion in the radial direction is suppressed by the lens frame portion 15 ′ having a smaller linear expansion coefficient than the lens portion 16 ′, and the thickness of the lens portion 16 ′ is reduced. It can expand in a biased direction (see FIG. 3). As described above, the curved surface of the lens portion 16 ′ is distorted by the expansion of the lens portion 16 ′ that is biased in the thickness direction.

一方で、本実施形態のレンズユニットにおいては、ヤング率がレンズ部１６よりも小さな緩衝部１７がレンズ部の径方向の膨張を許容するので、レンズ部１６の曲面における歪みの発生を抑制可能である。   On the other hand, in the lens unit of the present embodiment, since the buffer portion 17 having a Young's modulus smaller than that of the lens portion 16 allows the lens portion to expand in the radial direction, the occurrence of distortion on the curved surface of the lens portion 16 can be suppressed. is there.

また、本実施形態のレンズユニットによれば、α２＞α３を満たすので、低温の温度領域における緩衝部１７の収縮量はレンズ部１６の収縮量より小さい。一般的に、レンズ部１６の線膨張係数は鏡枠部１５の線膨張係数より大きく、低温の温度領域におけるレンズ部１６の外径の収縮量に比べて鏡枠部１５の内径の収縮量は小さい。それゆえ、緩衝部１７を介在させずに、レンズ部１６を鏡枠部１５に保持させる場合には低温の温度領域においてレンズ部１６と鏡枠部１５との間に隙間が生じ得る。一方で、本実施形態のレンズユニットによれば、上述のような条件の線膨張係数である緩衝部１７の外径の縮小量は当該緩衝部１７をレンズ部１６と同一の材料に置換した部材の外径の縮小量より小さい。したがって、外径の収縮量を鏡枠部１５の内径の収縮量に近付けることが可能なので、緩衝部１７と鏡枠部１５との間の隙間の発生が抑制される。   Further, according to the lens unit of the present embodiment, since α2> α3 is satisfied, the shrinkage amount of the buffer portion 17 in the low temperature range is smaller than the shrinkage amount of the lens portion 16. In general, the linear expansion coefficient of the lens unit 16 is larger than the linear expansion coefficient of the lens frame unit 15, and the contraction amount of the inner diameter of the lens frame unit 15 is smaller than the contraction amount of the outer diameter of the lens unit 16 in the low temperature range. small. Therefore, when the lens unit 16 is held on the lens frame unit 15 without the buffer unit 17 interposed, a gap may be generated between the lens unit 16 and the lens frame unit 15 in a low temperature range. On the other hand, according to the lens unit of the present embodiment, the reduction amount of the outer diameter of the buffer portion 17 which is the linear expansion coefficient under the above-described condition is a member obtained by replacing the buffer portion 17 with the same material as the lens portion 16. It is smaller than the reduction amount of the outer diameter. Therefore, since the shrinkage amount of the outer diameter can be made close to the shrinkage amount of the inner diameter of the lens frame portion 15, the generation of a gap between the buffer portion 17 and the lens frame portion 15 is suppressed.

また、本実施形態のレンズユニットによれば、α３＞α１を満たすので、低温の温度領域における緩衝部１７の収縮量は鏡枠部１５の収縮量よりも大きい。前述のように、緩衝部１７を介在させずに、レンズ部１６を鏡枠部１５に保持させる場合には低温の温度領域においてレンズ部１６と鏡枠部１５との間に隙間が生じ得る。一方で、本実施形態のレンズユニットによれば、上述のような条件の線膨張係数である緩衝部１７の内径の縮小量は当該緩衝部１７を鏡枠部１５と同一の材料に置換した部材の内径の縮小量より大きい。したがって、内径の縮小量をレンズ部１６の外径の縮小量に近付けることが可能なので、緩衝部１７とレンズ部１６との間の隙間の発生が抑制される。   Further, according to the lens unit of the present embodiment, α3> α1 is satisfied, so that the shrinkage amount of the buffer portion 17 in the low temperature range is larger than the shrinkage amount of the lens frame portion 15. As described above, when the lens unit 16 is held by the lens frame unit 15 without the buffer unit 17 interposed, a gap may be generated between the lens unit 16 and the lens frame unit 15 in a low temperature range. On the other hand, according to the lens unit of the present embodiment, the reduction amount of the inner diameter of the buffer portion 17 that is the linear expansion coefficient under the above-described condition is a member in which the buffer portion 17 is replaced with the same material as the lens frame portion 15. Is larger than the reduction amount of the inner diameter of Accordingly, since the reduction amount of the inner diameter can be made close to the reduction amount of the outer diameter of the lens portion 16, the generation of a gap between the buffer portion 17 and the lens portion 16 is suppressed.

また、本実施形態のレンズユニットによれば、φ１＞φ２＋φ２×α２×ΔＴを満たす形状にレンズ部１６が形成されるので、高温の温度領域である第２の温度においても鏡枠部１５の内径がレンズ部１６の外径より大きい。したがって、第２の温度においてもレンズ部１６の径方向の膨張の抑制が防がれ、レンズ部１６の曲面における歪みの抑制効果を向上可能である。   In addition, according to the lens unit of the present embodiment, the lens portion 16 is formed in a shape satisfying φ1> φ2 + φ2 × α2 × ΔT, so that the inner diameter of the lens frame portion 15 is also at the second temperature which is a high temperature region. Is larger than the outer diameter of the lens portion 16. Therefore, the suppression of the expansion of the lens portion 16 in the radial direction can be prevented even at the second temperature, and the effect of suppressing the distortion of the curved surface of the lens portion 16 can be improved.

また、本実施形態のレンズユニットによれば、緩衝部１７ならびにレンズ部１６は、圧入によりそれぞれ鏡枠部１５および緩衝部１７に組込まれるので、それぞれ緩衝部１７および鏡枠部１５間の隙間の発生、ならびにレンズ部１６および緩衝部１７間の隙間の発生をさらに抑制可能である。隙間の発生の抑制作用について、以下に説明する。   Further, according to the lens unit of the present embodiment, the buffer portion 17 and the lens portion 16 are respectively assembled into the lens frame portion 15 and the buffer portion 17 by press-fitting, so that the gaps between the buffer portion 17 and the lens frame portion 15 are respectively Generation and generation of a gap between the lens unit 16 and the buffer unit 17 can be further suppressed. The action of suppressing the generation of the gap will be described below.

緩衝部１７を圧入により鏡枠部１５に組込むために、緩衝部１７の外径が鏡枠部１５の内径より僅かに大きく形成される。それゆえ、低温の温度領域における緩衝部１７の収縮に対して、緩衝部１７と鏡枠部１５との間における隙間の発生がさらに抑制される。また、レンズ部１６を圧入により緩衝部１７に組込むために、緩衝部１７の内径がレンズ部１６の外径より僅かに小さく形成される。それゆえ、低温の温度領域におけるレンズ部１６の収縮に対して、レンズ部１６と緩衝部１７との間における隙間の発生がさらに抑制される。   In order to incorporate the buffer part 17 into the lens frame part 15 by press-fitting, the outer diameter of the buffer part 17 is formed slightly larger than the inner diameter of the lens frame part 15. Therefore, the occurrence of a gap between the buffer portion 17 and the lens frame portion 15 is further suppressed against the contraction of the buffer portion 17 in the low temperature range. Further, in order to incorporate the lens portion 16 into the buffer portion 17 by press-fitting, the inner diameter of the buffer portion 17 is formed slightly smaller than the outer diameter of the lens portion 16. Therefore, the occurrence of a gap between the lens unit 16 and the buffer unit 17 is further suppressed against the contraction of the lens unit 16 in the low temperature range.

本発明を諸図面や実施形態に基づき説明してきたが、当業者であれば本開示に基づき種々の変形や修正を行うことが容易であることに注意されたい。従って、これらの変形や修正は本発明の範囲に含まれることに留意されたい。   Although the present invention has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.

１０ 撮像装置
１１ レンズユニット
１２ 撮像素子
１３ ＡＦＥ（アナログフロントエンド）
１４ Ｉ／Ｆ（インターフェース）
１５、１５’ 鏡枠部
１６、１６’ レンズ部
１７ 緩衝部 DESCRIPTION OF SYMBOLS 10 Imaging device 11 Lens unit 12 Image sensor 13 AFE (analog front end)
14 I / F (interface)
15, 15 'lens frame part 16, 16' lens part 17 buffer part

Claims (6)

レンズ部と、
前記レンズ部を保持する鏡枠部と、
前記レンズ部よりもヤング率が小さく、前記レンズ部の外周および前記鏡枠部の内周の間に配置される緩衝部とを備える
ことを特徴とするレンズユニット。 The lens part,
A lens frame part for holding the lens part;
A lens unit having a Young's modulus smaller than that of the lens unit, and a buffer unit disposed between the outer periphery of the lens unit and the inner periphery of the lens frame unit. 請求項１に記載のレンズユニットであって、
前記緩衝部の線膨張係数は、前記レンズ部の線膨張係数より小さく且つ前記鏡枠部の線膨張係数より大きい
ことを特徴とするレンズユニット。 The lens unit according to claim 1,
The lens unit, wherein a linear expansion coefficient of the buffer portion is smaller than a linear expansion coefficient of the lens portion and larger than a linear expansion coefficient of the lens frame portion. レンズ部と、
前記レンズ部を保持する鏡枠部と、
前記レンズ部よりも線膨張係数が小さく且つ前記鏡枠部よりも線膨張係数が大きく、前記レンズ部の外周および前記鏡枠部の内周の間に配置される緩衝部とを備える
ことを特徴とするレンズユニット。 The lens part,
A lens frame part for holding the lens part;
A linear expansion coefficient is smaller than that of the lens unit and a linear expansion coefficient is larger than that of the lens frame unit, and a buffer unit is provided between the outer periphery of the lens unit and the inner periphery of the lens frame unit. Lens unit. 請求項１から請求項３のいずれか１項に記載のレンズユニットであって、
前記レンズユニットは、少なくとも常温の温度領域および高温の温度領域において使用されることが想定され、
前記鏡枠部の前記常温の温度領域内の第１の温度における内径をφ１、前記レンズ部の前記第１の温度における外径をφ２、前記鏡枠部の線膨張係数をα１、前記レンズ部の線膨張係数をα２、前記高温の温度領域内の第２の温度と前記第１の温度の差分をΔＴとするとき、
α２＞α１
φ１＞φ２+φ２×α２×ΔＴ
を満たす
ことを特徴とするレンズユニット。 The lens unit according to any one of claims 1 to 3,
The lens unit is assumed to be used at least in a normal temperature range and a high temperature range,
The inner diameter of the lens frame portion at a first temperature within the normal temperature range is φ1, the outer diameter of the lens portion at the first temperature is φ2, the linear expansion coefficient of the lens frame portion is α1, and the lens portion When the linear expansion coefficient is α2, and the difference between the second temperature in the high temperature region and the first temperature is ΔT,
α2> α1
φ1> φ2 + φ2 × α2 × ΔT
A lens unit characterized by satisfying 請求項１から請求項４のいずれか１項に記載のレンズユニットであって、
前記緩衝部の前記鏡枠部への組込み、および前記レンズ部の前記緩衝部への組込みの少なくとも一方が、圧入による
ことを特徴とするレンズユニット。 The lens unit according to any one of claims 1 to 4, wherein:
At least one of the incorporation of the buffer portion into the lens frame portion and the incorporation of the lens portion into the buffer portion is by press-fitting. 請求項１から請求項５のいずれか１項に記載のレンズユニットを備えることを特徴とする撮像装置。   An imaging apparatus comprising the lens unit according to any one of claims 1 to 5.
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