JP6448711B2 - Imaging device - Google Patents

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JP6448711B2
JP6448711B2 JP2017115899A JP2017115899A JP6448711B2 JP 6448711 B2 JP6448711 B2 JP 6448711B2 JP 2017115899 A JP2017115899 A JP 2017115899A JP 2017115899 A JP2017115899 A JP 2017115899A JP 6448711 B2 JP6448711 B2 JP 6448711B2
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sealing member
contact
image sensor
optical
imaging
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JP2019004248A (en
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文孝 相子
文孝 相子
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Canon Inc
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Description

本発明は、撮像面への異物の入り込みを防止するための封止部材を備える撮像装置に関する。   The present invention relates to an imaging apparatus including a sealing member for preventing foreign matter from entering an imaging surface.

従来、撮像素子の撮像面にゴミ等の異物が付着することによる撮影画像への写り込みを防ぐために、ゴム等の弾性材料で形成された封止部材が光学フィルタと撮像素子との間に配置される撮像装置が知られている。例えば、特許文献１には、弾性材料で形成される封止部材が、光学フィルタと撮像素子との間に位置し、撮像素子の受光面を包囲する技術が開示されている。また、特許文献２には、光学フィルタを、がたつきなく低コストで取り付ける技術が開示されている。特許文献２の装置では、弾性材料で成る遮光カバーに、光学フィルタを収容可能な収容開口部が設けられ、収容開口部の内周部に当接部と係合凸部とが形成される。光学フィルタが収容開口部内に押し込まれることで、光学フィルタの一方面側周縁部が当接部に当接すると共に、係合凸部の付勢面が光学フィルタの他方面側周縁部に当接して該光学フィルタを当接部に向けて付勢する。   Conventionally, a sealing member made of an elastic material such as rubber is disposed between the optical filter and the image sensor in order to prevent the image pickup surface of the image sensor from appearing on a captured image due to foreign matter such as dust adhering to the image sensor. An imaging device is known. For example, Patent Document 1 discloses a technique in which a sealing member formed of an elastic material is positioned between an optical filter and an image sensor and surrounds a light receiving surface of the image sensor. Patent Document 2 discloses a technique for attaching an optical filter at low cost without rattling. In the device of Patent Document 2, a light-shielding cover made of an elastic material is provided with a housing opening that can house an optical filter, and a contact portion and an engaging convex portion are formed on the inner peripheral portion of the housing opening. When the optical filter is pushed into the housing opening, the one-surface-side peripheral portion of the optical filter contacts the contact portion, and the urging surface of the engaging convex portion contacts the other-surface-side peripheral portion of the optical filter. The optical filter is biased toward the contact portion.

特許第５２９５３０４号公報Japanese Patent No. 5295304 特開２００５−３０９０５１号公報Japanese Patent Laying-Open No. 2005-309051

しかしながら、従来技術では以下に示す課題がある。まず、特許文献１の技術では、撮像素子は封止部材によって光学フィルタから離反する方向に付勢される。そのため、監視カメラのように高温下で使用される撮像装置の場合には特に、支持部材に接着固定した撮像素子の接着部が温度上昇等で軟化し、撮像素子が付勢方向に移動（変位）するおそれがある。また、特許文献２の技術でも、撮像素子が光学フィルタから離反する方向に付勢される点は特許文献１と同様であり、高温下では撮像素子が付勢方向に変位するおそれがある。   However, the conventional techniques have the following problems. First, in the technique of Patent Document 1, the imaging element is urged in a direction away from the optical filter by the sealing member. Therefore, especially in the case of an imaging device used at a high temperature such as a surveillance camera, the bonded portion of the imaging element that is bonded and fixed to the support member softens due to a temperature rise or the like, and the imaging element moves (displaces) in the biasing direction ) The technique of Patent Document 2 is the same as that of Patent Document 1 in that the image sensor is biased in the direction away from the optical filter, and the image sensor may be displaced in the bias direction at high temperatures.

本発明は、支持部材に対して撮像素子が変位しないように光学部材を保持することを目的とする。   An object of this invention is to hold | maintain an optical member so that an image pick-up element may not displace with respect to a support member.

上記目的を達成するために本発明は、撮像光学系により結像した被写体像を電気信号に変換する撮像素子と、保持部材と、前記撮像素子を支持し、前記保持部材に固定される支持部材と、前記撮像素子よりも被写体側に配置され、前記保持部材によって位置決めされる光学部材と、第１の当接部及び第２の当接部を有し、弾性材料で形成され、前記撮像素子とは非接触状態で前記撮像素子と前記光学部材との間に介在する封止部材と、を有し、前記封止部材は、前記第１の当接部が前記撮像素子の外形よりも外側で前記支持部材に当接すると共に前記第２の当接部が前記光学部材の外周部に当接することで、前記支持部材と前記光学部材とを前記撮像光学系の光軸方向において互いに離反する方向に付勢することを特徴とする。   In order to achieve the above object, the present invention provides an imaging device that converts a subject image formed by an imaging optical system into an electrical signal, a holding member, and a support member that supports the imaging device and is fixed to the holding member. And an optical member that is disposed closer to the subject than the image sensor and is positioned by the holding member, and a first contact portion and a second contact portion, and is formed of an elastic material, and the image sensor And a sealing member interposed between the imaging element and the optical member in a non-contact state, wherein the sealing member has the first contact portion outside the outer shape of the imaging element. In the direction in which the support member and the optical member are separated from each other in the optical axis direction of the imaging optical system by contacting the support member and the second contact portion contacting the outer peripheral portion of the optical member. It is characterized by energizing.

本発明によれば、支持部材に対して撮像素子が変位しないように光学部材を保持することができる。   According to the present invention, the optical member can be held so that the imaging element is not displaced with respect to the support member.

撮像装置の分解斜視図である。It is a disassembled perspective view of an imaging device. レンズユニット及びその周辺の要素の分解斜視図である。It is a disassembled perspective view of a lens unit and its peripheral element. レンズユニットを被写体側からみた図である。It is the figure which looked at the lens unit from the to-be-photographed object side. 撮像装置のブロック図である。It is a block diagram of an imaging device. 撮像素子が実装された基板を被写体側から見た図である。It is the figure which looked at the board | substrate with which the image pick-up element was mounted from the to-be-photographed object side. 封止部材を被写体側から見た図、封止部材の側面図、封止部材を撮像素子側から見た図である。It is the figure which looked at the sealing member from the to-be-photographed object side, the side view of a sealing member, and the figure which looked at the sealing member from the image pick-up element side. 図３のＡ−Ａ線に沿う断面図である。It is sectional drawing which follows the AA line of FIG. 撮像素子側から見たローパスフィルタ及びその周辺の模式図である。It is a schematic diagram of the low-pass filter and its periphery as seen from the image sensor side. 図３のＢ−Ｂ線に沿う断面図である。It is sectional drawing which follows the BB line of FIG. 図８のＣ−Ｃ線に沿う断面図である。It is sectional drawing which follows the CC line of FIG. 図３のＡ−Ａ線に沿う断面図である。It is sectional drawing which follows the AA line of FIG.

以下、図面を参照して本発明の実施の形態を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明の一実施の形態に係る撮像装置の分解斜視図である。この撮像装置は主に、ドームカバー２、ドーム３、レンズユニット４、ローパスフィルタ５、封止部材６、支持部材７、撮像素子８、基板９、パンチルトローテーションユニット１０を有する。支持部材７は接着によって撮像素子８を支持する金属部材である。撮像素子８は基板９に実装される。支持部材７はレンズユニット４に固定される。ローパスフィルタ５は、弾性材料で形成される封止部材６に付勢される態様で支持部材７に保持される光学部材である。パンチルトローテーションユニット１０は、ドームカバー２との間に挟み込まれるように配置されるレンズユニット４等の構成要素を、パン、チルト、ローテーション方向に回転可能に保持する。   FIG. 1 is an exploded perspective view of an imaging apparatus according to an embodiment of the present invention. This imaging apparatus mainly includes a dome cover 2, a dome 3, a lens unit 4, a low-pass filter 5, a sealing member 6, a support member 7, an imaging element 8, a substrate 9, and a pan / tilt rotation unit 10. The support member 7 is a metal member that supports the image sensor 8 by adhesion. The image sensor 8 is mounted on the substrate 9. The support member 7 is fixed to the lens unit 4. The low-pass filter 5 is an optical member that is held by the support member 7 in a manner that is biased by the sealing member 6 that is formed of an elastic material. The pan / tilt rotation unit 10 holds components such as the lens unit 4 disposed so as to be sandwiched between the dome cover 2 so as to be rotatable in the pan, tilt, and rotation directions.

図２は、レンズユニット４及びその周辺の要素の分解斜視図である。図３は、レンズユニット４を被写体側からみた図である。図２に示すように、レンズユニット４は、撮像光学系としてＬ１〜Ｌ４の４つのレンズ群を有する。まず、第１群レンズＬ１、第３群レンズＬ３は固定群の光学系である。第２群レンズＬ２は、撮像光学系の光軸Ｃ（図１）方向に移動してズーム動作を行う移動群の光学系である。第４群レンズＬ４は、光軸方向に移動して合焦動作を行う移動群の光学系である。固定枠１１は第１群レンズＬ１を保持し、ビス１１ａによって固定枠１２に固定される。固定枠１５は第３群レンズＬ３を保持する。固定枠１５は、固定枠１２と固定枠１７とに挟み込まれる態様で、第２群レンズＬ２に固定された絞りユニット（不図示）に係合している。   FIG. 2 is an exploded perspective view of the lens unit 4 and its peripheral elements. FIG. 3 is a view of the lens unit 4 as seen from the subject side. As shown in FIG. 2, the lens unit 4 has four lens groups L1 to L4 as an imaging optical system. First, the first group lens L1 and the third group lens L3 are fixed group optical systems. The second group lens L2 is a moving group optical system that moves in the direction of the optical axis C (FIG. 1) of the imaging optical system and performs a zoom operation. The fourth group lens L4 is an optical system of a moving group that moves in the optical axis direction and performs a focusing operation. The fixed frame 11 holds the first group lens L1, and is fixed to the fixed frame 12 by screws 11a. The fixed frame 15 holds the third group lens L3. The fixed frame 15 is engaged with a diaphragm unit (not shown) fixed to the second lens group L2 in a manner sandwiched between the fixed frame 12 and the fixed frame 17.

ガイドバー１３ｄ、１６ｄは各々、固定枠１２と固定枠１７とに固定されている。ガイドバー１３ｅは、固定枠１２と固定枠１５とに固定されている。ガイドバー１６ｅは、固定枠１２と固定枠１７とに固定されている。可動枠１３は第２群レンズＬ２を保持し、ガイドバー１３ｄによって光軸方向に移動可能に支持される。ガイドバー１３ｅに、可動枠１３の図示しないＵ溝が係合しており、これにより可動枠１３は、光軸周りの回転を規制される。可動枠１６は第４群レンズＬ４を保持し、ガイドバー１６ｄによって光軸方向に移動可能に支持される。ガイドバー１６ｅに、可動枠１６のＵ溝が係合しており、これにより可動枠１６は、光軸周りの回転を規制される。   The guide bars 13d and 16d are fixed to the fixed frame 12 and the fixed frame 17, respectively. The guide bar 13e is fixed to the fixed frame 12 and the fixed frame 15. The guide bar 16 e is fixed to the fixed frame 12 and the fixed frame 17. The movable frame 13 holds the second lens group L2, and is supported by the guide bar 13d so as to be movable in the optical axis direction. A U-groove (not shown) of the movable frame 13 is engaged with the guide bar 13e, whereby the movable frame 13 is restricted from rotating around the optical axis. The movable frame 16 holds the fourth group lens L4 and is supported by the guide bar 16d so as to be movable in the optical axis direction. The U-groove of the movable frame 16 is engaged with the guide bar 16e, whereby the movable frame 16 is restricted from rotating around the optical axis.

モータ２１、２２はいずれもステッピングモータである。ズーム用のモータ２１は、ビス１６ｂによって固定枠１２に固定される。可動枠１３に固定されたラック１３ｃにネジ部２１ａが係合し、モータ２１の回転により、可動枠１３は光軸方向に移動する。フォーカス用のモータ２２は、ビス２２ａによって固定枠１７に固定される。可動枠１６に固定されたラック１６ｃにネジ部２２ａが係合し、モータ２２の回転により、可動枠１６は光軸方向に移動する。ユニット１３ａは、フォトインタラプタと板金で構成され、固定枠１７にビス１３ｂによって固定される。ユニット１３ａは固定枠１７上に配置され、フォトインタラプタの出力とモータの回転数とによって可動枠１３の位置が制御される。また、固定枠１７には、フォトインタラプタと板金で構成された別のユニットが固定されている。このユニットは固定枠１７上に配置され、フォトインタラプタの出力とモータの回転数とによって可動枠１６の位置が制御される。   The motors 21 and 22 are both stepping motors. The zoom motor 21 is fixed to the fixed frame 12 by screws 16b. The threaded portion 21 a engages with the rack 13 c fixed to the movable frame 13, and the movable frame 13 moves in the optical axis direction by the rotation of the motor 21. The focus motor 22 is fixed to the fixed frame 17 by screws 22a. The threaded portion 22a engages with the rack 16c fixed to the movable frame 16, and the movable frame 16 moves in the optical axis direction by the rotation of the motor 22. The unit 13a is composed of a photo interrupter and a sheet metal, and is fixed to the fixed frame 17 with screws 13b. The unit 13a is disposed on the fixed frame 17, and the position of the movable frame 13 is controlled by the output of the photo interrupter and the rotational speed of the motor. Further, another unit composed of a photo interrupter and a sheet metal is fixed to the fixed frame 17. This unit is disposed on the fixed frame 17, and the position of the movable frame 16 is controlled by the output of the photo interrupter and the rotational speed of the motor.

赤外線カットフィルタ１９ａはローパスフィルタ５とは別の光学部材である。フィルタ枠１９は赤外線カットフィルタ１９ａを保持する保持枠である。フィルタ切替え用のアクチュエータ１８、フィルタ枠１９及び赤外線カットフィルタ１９ａは、固定枠１７と保持部材２０とに挟まれる位置に配置される。固定枠１７と保持部材２０とはビス３１によって固定される。アクチュエータ１８は、赤外線カットフィルタ１９ａを保持したフィルタ枠１９を光軸Ｃに垂直な方向へ移動させ、これにより赤外線カットフィルタ１９ａを光路上に対して挿脱できる。ユニット１９ｂは、フォトインタラプタと板金で構成され、保持部材２０にビス１９ｃによって固定される。ユニット１９ｂは保持部材２０上に配置され、フォトインタラプタの出力によってフィルタ枠１９の位置が判別される。ビス７ｂによって支持部材７が保持部材２０に固定されることで、ローパスフィルタ５は封止部材６に付勢される態様で保持される。   The infrared cut filter 19 a is an optical member different from the low-pass filter 5. The filter frame 19 is a holding frame that holds the infrared cut filter 19a. The filter switching actuator 18, the filter frame 19, and the infrared cut filter 19 a are arranged at positions sandwiched between the fixed frame 17 and the holding member 20. The fixed frame 17 and the holding member 20 are fixed by screws 31. The actuator 18 moves the filter frame 19 holding the infrared cut filter 19a in a direction perpendicular to the optical axis C, whereby the infrared cut filter 19a can be inserted into and removed from the optical path. The unit 19b is composed of a photo interrupter and a sheet metal, and is fixed to the holding member 20 with screws 19c. The unit 19b is disposed on the holding member 20, and the position of the filter frame 19 is determined by the output of the photo interrupter. By fixing the support member 7 to the holding member 20 with the screws 7 b, the low-pass filter 5 is held in a manner in which it is biased by the sealing member 6.

図４は、撮像装置のブロック図である。撮影時に被写体光がレンズユニット４の撮像光学系により撮像素子８の撮像面に結像し、結像した被写体像を撮像素子８が電気信号に変換する。その電気信号はカメラ処理信号部２３によりデジタル信号に変換され、ＡＦゲート２４を経由してＡＦ信号処理２５で所定の処理を施されてＣＰＵ２６に入力される。ＣＰＵ２６は、入力された信号を元にモータ２１、２２によって第２群レンズＬ２、第４群レンズＬ４を光軸方向に移動させる。ＣＰＵ２６は、絞りモータ１４を動作させて絞り羽根を変化させる。また、ＣＰＵ２６は、夜間撮影を行う場合はアクチュエータ１８を動作させて赤外線カットフィルタ１９ａを光路外に退避させる。またＰＣ２９は、チルト角が入力されると、チルトモータ２７を動作させてチルトユニット２８を駆動し、レンズユニット４のチルト角を変化させる。チルトユニット２８はチルト角を検知する機能も備えており、検知されたチルト角はＣＰＵ２６を介してパーソナルコンピュータ（ＰＣ）２９にフィードバックされる。   FIG. 4 is a block diagram of the imaging apparatus. At the time of shooting, subject light is imaged on the imaging surface of the image sensor 8 by the imaging optical system of the lens unit 4, and the imaged subject image is converted into an electrical signal. The electric signal is converted into a digital signal by the camera processing signal unit 23, subjected to predetermined processing by the AF signal processing 25 via the AF gate 24, and input to the CPU 26. The CPU 26 moves the second lens group L2 and the fourth lens group L4 in the optical axis direction by the motors 21 and 22 based on the input signal. The CPU 26 operates the aperture motor 14 to change the aperture blade. Further, when performing night photography, the CPU 26 operates the actuator 18 to retract the infrared cut filter 19a out of the optical path. Further, when the tilt angle is input, the PC 29 operates the tilt motor 27 to drive the tilt unit 28 to change the tilt angle of the lens unit 4. The tilt unit 28 also has a function of detecting a tilt angle, and the detected tilt angle is fed back to a personal computer (PC) 29 via the CPU 26.

図５は、撮像素子８が実装された基板９を被写体側から見た図である。撮像素子８は、レンズユニット４を通して結像した撮像エリア８ａの被写体像を電気信号に変換する。撮像エリア８ａは、撮像装置が撮像可能な矩形の領域である。撮像素子８のパッケージの短辺８ｂは、短辺８ｂと平行な撮像エリア８ａの短辺８ｄの２倍以上の長さを有する。また、パッケージの長辺８ｃは、長辺８ｃと平行な撮像エリア８ａの長辺８ｅの２倍以上の長さを有する。撮像エリア８ａの長辺８ｅと短辺８ｄのサイズ比は１６：９である。撮像素子８の矩形の外形はローパスフィルタ５の矩形の外形よりも大きい。すなわち、撮像素子８の外形の４辺はそれぞれ、各辺に平行なローパスフィルタ５の外形の４辺より長い。   FIG. 5 is a view of the substrate 9 on which the image sensor 8 is mounted as viewed from the subject side. The imaging element 8 converts the subject image of the imaging area 8a formed through the lens unit 4 into an electrical signal. The imaging area 8a is a rectangular area that can be imaged by the imaging apparatus. The short side 8b of the package of the imaging element 8 has a length that is twice or more the short side 8d of the imaging area 8a parallel to the short side 8b. The long side 8c of the package has a length that is at least twice as long as the long side 8e of the imaging area 8a parallel to the long side 8c. The size ratio of the long side 8e and the short side 8d of the imaging area 8a is 16: 9. The rectangular outer shape of the image sensor 8 is larger than the rectangular outer shape of the low-pass filter 5. That is, the four sides of the outer shape of the image sensor 8 are each longer than the four sides of the outer shape of the low-pass filter 5 parallel to each side.

図６（ａ）、（ｃ）はそれぞれ、封止部材６を被写体側、撮像素子側から見た図である。図６（ｂ）は封止部材６の側面図である。封止部材６は、撮像素子８の撮像エリア８ａにゴミ等の異物が付着しないようにするために設けられる。封止部材６は、被写体光を通過させるための開口部６ｆを有する。開口部６ｆは、２つの短辺６ｆ１と２つの長辺６ｆ２とを有する矩形の開口部である。開口部６ｆは、ローパスフィルタ５の外形よりも小さい。開口部６ｆの短辺６ｆ１、長辺６ｆ２が、撮像エリア８ａの短辺８ｄ、長辺８ｅに対応している。封止部材６の撮像素子側の面には、撮像素子側に突出する環状形状の付勢部６ｅが形成されている（図６（ｃ））。付勢部６ｅは、支持部材７と当接して支持部材７を付勢する第１の当接部である。付勢部６ｅは連続して形成され、その全周に亘って支持部材７に当接する。封止部材６の被写体側の面における開口部６ｆの周囲の環状部分は押圧部６ｂである（図６（ａ））。押圧部６ｂは、ローパスフィルタ５と当接してローパスフィルタ５を押圧する第２の当接部である。   6A and 6C are views of the sealing member 6 as viewed from the subject side and the image sensor side, respectively. FIG. 6B is a side view of the sealing member 6. The sealing member 6 is provided to prevent foreign matters such as dust from adhering to the imaging area 8 a of the imaging element 8. The sealing member 6 has an opening 6f for allowing subject light to pass therethrough. The opening 6f is a rectangular opening having two short sides 6f1 and two long sides 6f2. The opening 6 f is smaller than the outer shape of the low-pass filter 5. The short side 6f1 and the long side 6f2 of the opening 6f correspond to the short side 8d and the long side 8e of the imaging area 8a. On the surface of the sealing member 6 on the image sensor side, an annular urging portion 6e protruding toward the image sensor side is formed (FIG. 6C). The urging portion 6 e is a first abutting portion that abuts on the support member 7 and urges the support member 7. The urging portion 6e is formed continuously and contacts the support member 7 over the entire circumference. An annular portion around the opening 6f on the subject-side surface of the sealing member 6 is a pressing portion 6b (FIG. 6A). The pressing portion 6 b is a second contact portion that contacts the low-pass filter 5 and presses the low-pass filter 5.

封止部材６の被写体側に挿通部６ａが２つ突設されている（図６（ａ）、（ｂ））。挿通部６ａは、開口部６ｆの短辺６ｆ１の各々の近傍に設けられる。挿通部６ａは各々、保持部材２０が有する貫通穴である穴部２０ｄ（図９、図１０で後述）に挿通される。挿通部６ａは先端部に抜け止め用の鉤部６ｃを有し、挿通部６ａが穴部２０ｄから抜けることを抑止する。封止部材６の撮像素子側に、撮像素子８に対向して突起部６ｄが２つ突設されている（図６（ｃ））。突起部６ｄは、開口部６ｆの２つの長辺６ｆ２の各々に対応して設けられる。各突起部６ｄは、対応する長辺６ｆ２の略中央近傍（長辺６ｆ２の長さ方向における略中心）に位置する。封止部材６の外周部には、被写体側に突出した突条部６ｇが形成されている（図６（ａ））。突条部６ｇは封止部材６の最外周部の全周に亘って形成される。   Two insertion portions 6a project from the subject side of the sealing member 6 (FIGS. 6A and 6B). The insertion part 6a is provided in the vicinity of each of the short sides 6f1 of the opening 6f. Each of the insertion portions 6a is inserted into a hole portion 20d (which will be described later with reference to FIGS. 9 and 10) which is a through hole of the holding member 20. The insertion part 6a has a hook part 6c for retaining the tip at the tip part, and prevents the insertion part 6a from coming out of the hole part 20d. Two projections 6d are provided on the image pickup element side of the sealing member 6 so as to face the image pickup element 8 (FIG. 6C). The protrusion 6d is provided corresponding to each of the two long sides 6f2 of the opening 6f. Each protrusion 6d is located in the vicinity of the approximate center of the corresponding long side 6f2 (substantially the center of the long side 6f2 in the length direction). On the outer peripheral portion of the sealing member 6, a protruding portion 6g protruding toward the subject is formed (FIG. 6A). The protruding portion 6g is formed over the entire circumference of the outermost peripheral portion of the sealing member 6.

図７は、図３のＡ−Ａ線に沿う断面図である。図８は、撮像素子側から見たローパスフィルタ５及びその周辺の模式図である。図８では、封止部材６、支持部材７、撮像素子８、基板９の図示は省略されている。図９は、図３のＢ−Ｂ線に沿う断面図である。図１０は、図８のＣ−Ｃ線に沿う断面図である。   7 is a cross-sectional view taken along line AA in FIG. FIG. 8 is a schematic diagram of the low-pass filter 5 and its surroundings as seen from the image sensor side. In FIG. 8, illustration of the sealing member 6, the support member 7, the imaging element 8, and the substrate 9 is omitted. 9 is a cross-sectional view taken along line BB in FIG. 10 is a cross-sectional view taken along the line CC of FIG.

図７に示すように、撮像素子８は支持部材７に接着部７ａにて接着固定されることで支持部材７に支持される。接着部７ａには例えば、紫外線硬化樹脂等の接着剤が用いられる。支持部材７には、撮像素子８の外形よりも外側に（撮像素子８を囲む形で）凹状部７ｃが形成されている。凹状部７ｃは、光軸方向から見て付勢部６ｅに対応する環状に形成される。封止部材６は、撮像素子８とは非接触状態で撮像素子８とローパスフィルタ５との間に介在する。封止部材６は、付勢部６ｅが支持部材７の凹状部７ｃの底部に当接すると共に、押圧部６ｂがローパスフィルタ５の外周部５ａに当接している。これにより、封止部材６は、支持部材７とローパスフィルタ５とを光軸方向において互いに離反する方向に付勢する。ローパスフィルタ５は、押圧部６ｂからの付勢力を受けて、保持部材２０の位置決め部２０ａに押圧され光軸方向に位置決めされて保持部材２０に保持される。付勢部６ｅは、対応する形状の凹状部７ｃと当接するので、付勢部６ｅの支持部材７に対する接触位置が安定する。その結果、押圧部６ｂによるローパスフィルタ５への付勢力も安定する。   As shown in FIG. 7, the imaging element 8 is supported by the support member 7 by being bonded and fixed to the support member 7 by the adhesive portion 7 a. For example, an adhesive such as an ultraviolet curable resin is used for the bonding portion 7a. A concave portion 7 c is formed on the support member 7 outside the outer shape of the image sensor 8 (in a form surrounding the image sensor 8). The concave portion 7c is formed in an annular shape corresponding to the urging portion 6e when viewed from the optical axis direction. The sealing member 6 is interposed between the image sensor 8 and the low-pass filter 5 in a non-contact state with the image sensor 8. In the sealing member 6, the urging portion 6 e is in contact with the bottom of the concave portion 7 c of the support member 7, and the pressing portion 6 b is in contact with the outer peripheral portion 5 a of the low-pass filter 5. Thereby, the sealing member 6 urges the support member 7 and the low-pass filter 5 in directions away from each other in the optical axis direction. The low-pass filter 5 receives an urging force from the pressing portion 6b, is pressed by the positioning portion 20a of the holding member 20, is positioned in the optical axis direction, and is held by the holding member 20. Since the urging portion 6e contacts the corresponding concave portion 7c, the contact position of the urging portion 6e with respect to the support member 7 is stabilized. As a result, the urging force applied to the low-pass filter 5 by the pressing portion 6b is also stabilized.

付勢部６ｅは支持部材７を付勢するが撮像素子８自体を付勢しないので、接着部７ａが温度上昇等で軟化したとしても、撮像素子８が付勢方向に変位（移動）することが回避される。付勢部６ｅは、全周に亘って支持部材７に当接するので、ローパスフィルタ５と支持部材７とを離反する方向に付勢する力が安定する。それだけでなく、付勢部６ｅによるシール性が高まり、封止部材６と支持部材７との隙間から内部に異物が入るのを防ぐことができる。さらに付勢部６ｅは接着部７ａに触れない位置（接着部７ａよりも外側）で支持部材７に当接する。これによっても、接着部７ａが温度上昇等で軟化したとしても、撮像素子８の変位が回避される。なお、被写体側からの力がローパスフィルタ５に加わっていない通常状態では封止部材６と撮像素子８とが非接触状態であるが、被写体側からの力がローパスフィルタ５に加わると両者は当接状態となり得る（図１１で後述する）。   The urging portion 6e urges the support member 7 but does not urge the imaging device 8 itself. Therefore, even if the bonding portion 7a is softened due to a temperature rise or the like, the imaging device 8 is displaced (moved) in the urging direction. Is avoided. Since the urging portion 6e contacts the support member 7 over the entire circumference, the force that urges the low-pass filter 5 and the support member 7 away from each other is stabilized. In addition, the sealing performance by the urging portion 6e is enhanced, and foreign matter can be prevented from entering through the gap between the sealing member 6 and the support member 7. Further, the urging portion 6e contacts the support member 7 at a position where it does not touch the bonding portion 7a (outside the bonding portion 7a). This also avoids displacement of the image sensor 8 even if the bonding portion 7a is softened due to a temperature rise or the like. In a normal state where no force from the subject side is applied to the low-pass filter 5, the sealing member 6 and the imaging element 8 are in a non-contact state. It can be in contact (described later in FIG. 11).

保持部材２０には、被写体光を撮像素子８に入射させるための矩形の開口部２０ｃが形成される（図７、図９）。保持部材２０は、ローパスフィルタ５を光軸方向に位置決めする位置決め部２０ａ、ローパスフィルタ５を光軸Ｃに垂直な方向に位置決めする位置決め部２０ｂを有する（図７）。保持部材２０には、貫通穴である穴部２０ｄが形成され、穴部２０ｄに封止部材６の挿通部６ａが挿通されている（図１０）。穴部２０ｄを貫通した挿通部６ａの鉤部６ｃが穴部２０ｄの被写体側の部分に係止されることで、挿通部６ａが穴部２０ｄから抜けることが防止されると共に、封止部材６の挿通部６ａ付近の肉部をローパスフィルタ５側に押圧する力が高まっている。   The holding member 20 is formed with a rectangular opening 20c for allowing subject light to enter the image sensor 8 (FIGS. 7 and 9). The holding member 20 has a positioning part 20a for positioning the low-pass filter 5 in the optical axis direction, and a positioning part 20b for positioning the low-pass filter 5 in a direction perpendicular to the optical axis C (FIG. 7). A hole 20d that is a through hole is formed in the holding member 20, and the insertion portion 6a of the sealing member 6 is inserted through the hole 20d (FIG. 10). The hook portion 6c of the insertion portion 6a penetrating the hole portion 20d is locked to the subject side portion of the hole portion 20d, so that the insertion portion 6a is prevented from coming out of the hole portion 20d and the sealing member 6 is used. The force that presses the meat portion near the insertion portion 6a toward the low-pass filter 5 is increasing.

ところで、封止部材６は、支持部材７に対しては撮像素子８の外形よりも外側に当接し、ローパスフィルタ５に対しては撮像素子８の外形よりも内側に当接している。これにより、封止部材６は、撮像素子８に対して非接触状態で介在できる。しかし、採用される撮像素子８の外形が大きい場合は、光軸Ｃに直交する方向における押圧部６ｂと付勢部６ｅとの距離が長くなる。すると、封止部材６によるローパスフィルタ５に対する付勢力が弱くなり、撮像装置の落下や振動などの衝撃によって、保持部材２０からローパスフィルタ５が脱落するおそれがある。そこで本実施の形態では、挿通部６ａが穴部２０ｄに抜け止め状態で係合することで、封止部材６と保持部材２０とでローパスフィルタ５を挟む力を作用させ、封止部材６によるローパスフィルタ５への適切な押圧力を確保する。これにより、撮像素子８のサイズが大きいために押圧部６ｂと付勢部６ｅとの距離が長い設計であっても、保持部材２０からのローパスフィルタ５の脱落が防止される。   By the way, the sealing member 6 is in contact with the support member 7 on the outer side of the outer shape of the image sensor 8, and the low-pass filter 5 is in contact with the inner side of the outer shape of the image sensor 8. Thereby, the sealing member 6 can interpose with respect to the image pick-up element 8 in a non-contact state. However, when the outer shape of the image sensor 8 to be employed is large, the distance between the pressing portion 6b and the urging portion 6e in the direction orthogonal to the optical axis C is increased. Then, the urging force of the sealing member 6 against the low-pass filter 5 is weakened, and the low-pass filter 5 may fall off the holding member 20 due to an impact such as dropping or vibration of the imaging device. Therefore, in the present embodiment, the insertion portion 6a is engaged with the hole portion 20d in a retaining state, so that a force for sandwiching the low-pass filter 5 between the sealing member 6 and the holding member 20 is applied. An appropriate pressing force to the low-pass filter 5 is ensured. Thereby, even if the distance between the pressing portion 6b and the urging portion 6e is long because the size of the image sensor 8 is large, the low-pass filter 5 is prevented from falling off the holding member 20.

なお、挿通部６ａは穴部２０ｄを貫通して保持部材２０の被写体側に突出する（図９、図１０）。一方、フィルタ枠１９には、挿通部６ａに対応して凹状の逃げ溝１９ｄが形成されている（図９）。挿通部６ａの先端部が逃げ溝１９ｄに入ることで、光軸方向における省スペースが図られると共に、フィルタ枠１９と保持部材２０との間から内部にゴミ等の異物が入ることが抑制される。ここで、逃げ溝１９ｄは、逃げ形状として、フィルタ枠１９の移動方向で且つ開口部６ｆの短辺６ｆ１と略平行に形成される。仮に、開口部６ｆの長辺６ｆ２の近傍に逃げ溝１９ｄ及び挿通部６ａを配置したとすると、挿通部６ａが赤外線カットフィルタ１９ａに干渉するおそれがあるが、挿通部６ａが短辺６ｆ１近傍に配置されることで、干渉の回避や逃げ形状の形成が容易となっている。   The insertion portion 6a passes through the hole 20d and protrudes toward the subject side of the holding member 20 (FIGS. 9 and 10). On the other hand, a concave relief groove 19d is formed in the filter frame 19 corresponding to the insertion portion 6a (FIG. 9). By inserting the distal end of the insertion portion 6a into the escape groove 19d, space is saved in the optical axis direction, and foreign matter such as dust is suppressed from entering between the filter frame 19 and the holding member 20. . Here, the escape groove 19d is formed as a relief shape in the moving direction of the filter frame 19 and substantially parallel to the short side 6f1 of the opening 6f. If the escape groove 19d and the insertion portion 6a are arranged in the vicinity of the long side 6f2 of the opening 6f, the insertion portion 6a may interfere with the infrared cut filter 19a, but the insertion portion 6a is in the vicinity of the short side 6f1. By being arranged, it is easy to avoid interference and form a relief shape.

突起部６ｄは、被写体側からの所定以上の力がローパスフィルタ５に加わると、撮像素子８に当接し、ローパスフィルタ５の脱落を防止する役割を有する。図１１は、図３のＡ−Ａ線に沿う断面図であり、特に、突起部６ｄが撮像素子８に当接した状態を示している。ローパスフィルタ５の外形が撮像素子８のパッケージの外形より十分に小さい場合、押圧部６ｂと付勢部６ｅとの距離（特に光軸Ｃに垂直な方向の距離）が長くなり、封止部材６が光軸方向に撓みやすくなり弾性変形量が大きくなる。ここで、光軸方向において被写体側からの所定以上の力がローパスフィルタ５を介して押圧部６ｂに加わると、封止部材６が光軸方向に撓む。その際、光軸方向の変形量が最も大きくなるのは開口部６ｆの長辺６ｆ２の中央である。ところが、各突起部６ｄは、対応する長辺６ｆ２の略中央近傍に設けられている。そのため、封止部材６のうち突起部６ｄが最初に撮像素子８に接触する。これにより、封止部材６の過剰な変形が抑制され、ローパスフィルタ５が光軸方向に動いて脱落することが効果的に回避される。   The protrusion 6d has a role of contacting the image sensor 8 and preventing the low-pass filter 5 from falling off when a predetermined force or more from the subject side is applied to the low-pass filter 5. FIG. 11 is a cross-sectional view taken along line AA in FIG. 3, and particularly shows a state in which the protrusion 6 d is in contact with the image sensor 8. When the external shape of the low-pass filter 5 is sufficiently smaller than the external shape of the package of the image sensor 8, the distance between the pressing portion 6 b and the urging portion 6 e (particularly the distance in the direction perpendicular to the optical axis C) becomes long, and the sealing member 6. Tends to bend in the direction of the optical axis, and the amount of elastic deformation increases. Here, when a predetermined force or more from the subject side in the optical axis direction is applied to the pressing portion 6b via the low-pass filter 5, the sealing member 6 bends in the optical axis direction. At this time, the deformation amount in the optical axis direction is greatest at the center of the long side 6f2 of the opening 6f. However, each protrusion 6d is provided in the vicinity of the approximate center of the corresponding long side 6f2. Therefore, the protrusion 6 d of the sealing member 6 first contacts the image sensor 8. Thereby, excessive deformation of the sealing member 6 is suppressed, and it is effectively avoided that the low-pass filter 5 moves in the optical axis direction and falls off.

図７に示すように、突条部６ｇは、保持部材２０に対して入れ子状態となっている。すなわち、光軸Ｃに直交する方向から見て、保持部材２０の一部と突条部６ｇとはオーバーラップしている。具体的には、突条部６ｇは、被写体側に突出しており、保持部材２０には、突条部６ｇに対応する凹状部が形成されており、突条部６ｇが凹状部に嵌っている。これにより、保持部材２０と封止部材６との隙間から内部にゴミが入るのを一層防ぐことが可能となり、撮像素子８に侵入するゴミ対策が強化される。   As shown in FIG. 7, the protruding portion 6 g is nested with respect to the holding member 20. That is, when viewed from the direction perpendicular to the optical axis C, a part of the holding member 20 and the protruding portion 6g overlap. Specifically, the protruding portion 6g protrudes toward the subject, and the holding member 20 has a concave portion corresponding to the protruding portion 6g, and the protruding portion 6g fits into the concave portion. . Thereby, it becomes possible to further prevent dust from entering through the gap between the holding member 20 and the sealing member 6, and measures against dust entering the image sensor 8 are strengthened.

本実施の形態によれば、封止部材６は、撮像素子８とは非接触状態で撮像素子８とローパスフィルタ５との間に介在する。そして封止部材６は、撮像素子８の外形よりも外側で付勢部６ｅが支持部材７に当接すると共に、押圧部６ｂがローパスフィルタ５の外周部５ａに当接することで、支持部材７とローパスフィルタ５とを光軸方向において互いに離反する方向に付勢する。また、付勢部６ｅは接着部７ａにも当接しない。これらにより、接着部７ａが温度上昇等で軟化したとしても、支持部材７に対して撮像素子８が変位しないようにローパスフィルタ５を保持することができる。また、付勢部６ｅは、全周に亘って支持部材７に当接するので、ゴミ対策が確保されると共に、ローパスフィルタ５への付勢力が安定する。しかも、付勢部６ｅは凹状部７ｃと当接するので、封止部材６の位置が安定し、支持部材７及びローパスフィルタ５への、互いに離反する方向への付勢力も安定する。   According to the present embodiment, the sealing member 6 is interposed between the image sensor 8 and the low-pass filter 5 in a non-contact state with the image sensor 8. The energizing portion 6e is in contact with the support member 7 outside the outer shape of the imaging element 8 and the pressing portion 6b is in contact with the outer peripheral portion 5a of the low-pass filter 5 so that the sealing member 6 The low pass filter 5 is urged away from each other in the optical axis direction. Further, the urging portion 6e does not contact the bonding portion 7a. Accordingly, even when the bonding portion 7a is softened due to a temperature rise or the like, the low-pass filter 5 can be held so that the imaging element 8 is not displaced with respect to the support member 7. Further, since the urging portion 6e contacts the support member 7 over the entire circumference, dust countermeasures are ensured and the urging force to the low-pass filter 5 is stabilized. In addition, since the urging portion 6e is in contact with the concave portion 7c, the position of the sealing member 6 is stabilized, and the urging force toward the support member 7 and the low-pass filter 5 in the direction away from each other is also stabilized.

また、封止部材６の挿通部６ａが保持部材２０の穴部２０ｄに挿通され、鉤部６ｃが抜け止め機能を果たすので、保持部材２０からのローパスフィルタ５の脱落を防止すると共に、封止部材６のローパスフィルタ５への押圧力が高まる。しかも、挿通部６ａが開口部６ｆの短辺６ｆ１近傍に配置されたので、挿通部６ａに対する逃げ形状を形成するのが容易であり、他の部材とも干渉しにくい。具体的に、フィルタ枠１９に、挿通部６ａが入る逃げ形状として逃げ溝１９ｄを形成したので、光軸方向の省スペースを図ることができると共に、フィルタ枠１９と保持部材２０との間から内部に異物が入ることを抑制できる。   In addition, since the insertion portion 6a of the sealing member 6 is inserted into the hole portion 20d of the holding member 20 and the flange portion 6c functions to prevent the low-pass filter 5 from falling off the holding member 20, the sealing member 6 is sealed. The pressing force of the member 6 to the low pass filter 5 is increased. Moreover, since the insertion portion 6a is disposed in the vicinity of the short side 6f1 of the opening 6f, it is easy to form a relief shape with respect to the insertion portion 6a, and it is difficult to interfere with other members. Specifically, since the relief groove 19d is formed in the filter frame 19 as a relief shape into which the insertion portion 6a enters, space saving in the optical axis direction can be achieved, and the space between the filter frame 19 and the holding member 20 can be reduced. It is possible to prevent foreign matter from entering.

また、封止部材６の突起部６ｄは、通常状態では撮像素子８に対して離間していて、被写体側からの所定以上の力がローパスフィルタ５に加わると撮像素子８に当接するので、ローパスフィルタ５への過負荷発生時にもローパスフィルタ５の脱落を防止できる。特に、各突起部６ｄは、対応する長辺６ｆ２の略中央近傍に設けられるので、封止部材６の過剰な変形が抑制され、ローパスフィルタ５の脱落を効果的に防止できる。   In addition, the projection 6d of the sealing member 6 is separated from the image sensor 8 in a normal state, and comes into contact with the image sensor 8 when a predetermined force or more from the subject side is applied to the low-pass filter 5, so that the low pass Even when the filter 5 is overloaded, the low-pass filter 5 can be prevented from falling off. In particular, since each projection 6d is provided in the vicinity of the center of the corresponding long side 6f2, excessive deformation of the sealing member 6 is suppressed, and the low-pass filter 5 can be effectively prevented from falling off.

また、突条部６ｇは、保持部材２０に対して入れ子状態となっているので、保持部材２０と封止部材６との間の異物侵入の防止効果が強化される。   Further, since the protruding portion 6g is nested with respect to the holding member 20, the effect of preventing foreign matter from entering between the holding member 20 and the sealing member 6 is enhanced.

以上、本発明をその好適な実施形態に基づいて詳述してきたが、本発明はこれら特定の実施形態に限られるものではなく、この発明の要旨を逸脱しない範囲の様々な形態も本発明に含まれる。   Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included.

５ ローパスフィルタ
５ａ 外周部
６ 封止部材
６ｅ 付勢部
６ｂ 押圧部
７ 支持部材
８ 撮像素子
２０ 保持部材

DESCRIPTION OF SYMBOLS 5 Low pass filter 5a Outer peripheral part 6 Sealing member 6e Energizing part 6b Pressing part 7 Supporting member 8 Imaging element 20 Holding member

Claims (10)

撮像光学系により結像した被写体像を電気信号に変換する撮像素子と、
保持部材と、
前記撮像素子を支持し、前記保持部材に固定される支持部材と、
前記撮像素子よりも被写体側に配置され、前記保持部材によって位置決めされる光学部材と、
第１の当接部及び第２の当接部を有し、弾性材料で形成され、前記撮像素子とは非接触状態で前記撮像素子と前記光学部材との間に介在する封止部材と、を有し、
前記封止部材は、前記第１の当接部が前記撮像素子の外形よりも外側で前記支持部材に当接すると共に前記第２の当接部が前記光学部材の外周部に当接することで、前記支持部材と前記光学部材とを前記撮像光学系の光軸方向において互いに離反する方向に付勢することを特徴とする撮像装置。 An image sensor that converts an object image formed by the imaging optical system into an electrical signal;
A holding member;
A support member that supports the imaging element and is fixed to the holding member;
An optical member that is disposed closer to the subject than the image sensor and is positioned by the holding member;
A sealing member that has a first contact portion and a second contact portion, is formed of an elastic material, and is interposed between the image sensor and the optical member in a non-contact state with the image sensor; Have
In the sealing member, the first contact portion is in contact with the support member outside the outer shape of the imaging element, and the second contact portion is in contact with an outer peripheral portion of the optical member. An image pickup apparatus that biases the support member and the optical member in directions away from each other in the optical axis direction of the image pickup optical system. 前記第１の当接部は、全周に亘って前記支持部材に当接することを特徴とする請求項１に記載の撮像装置。   The imaging apparatus according to claim 1, wherein the first contact portion contacts the support member over the entire circumference. 前記撮像素子は前記支持部材に接着部で固定され、
前記第１の当接部は、前記接着部には当接しないことを特徴とする請求項１または２に記載の撮像装置。 The imaging element is fixed to the support member with an adhesive portion,
The imaging apparatus according to claim 1, wherein the first contact portion does not contact the bonding portion. 前記保持部材は貫通穴を有し、
前記封止部材は、被写体側に突設され且つ前記貫通穴に挿通される挿通部を有し、前記挿通部は抜け止め用の鉤部を有することを特徴とする請求項１〜３のいずれか１項に記載の撮像装置。 The holding member has a through hole;
4. The sealing member according to claim 1, wherein the sealing member has an insertion portion that protrudes from the subject side and is inserted into the through hole, and the insertion portion has a collar portion for preventing the removal. The imaging apparatus of Claim 1. 前記封止部材は、被写体光を通過させるための矩形の開口部を有し、
前記挿通部は、前記封止部材における前記開口部の２つの短辺の各々の近傍に設けられたことを特徴とする請求項４に記載の撮像装置。 The sealing member has a rectangular opening for allowing subject light to pass through;
The imaging device according to claim 4, wherein the insertion portion is provided in the vicinity of each of two short sides of the opening in the sealing member. 前記保持部材よりも被写体側に配置され、前記光学部材とは別の光学部材と、
前記別の光学部材を保持する保持枠と、を有し、
前記保持枠には、前記挿通部が入る逃げ溝が形成されていることを特徴とする請求項４または５に記載の撮像装置。 An optical member that is disposed closer to the subject than the holding member and is different from the optical member;
A holding frame for holding the other optical member,
The imaging apparatus according to claim 4 or 5, wherein an escape groove into which the insertion portion is inserted is formed in the holding frame. 前記封止部材は、前記撮像素子に対向する突起部を有し、
前記突起部は、被写体側からの力が前記光学部材に加わらない通常状態では前記撮像素子に対して離間していて、被写体側からの所定以上の力が前記光学部材に加わると前記撮像素子に当接することを特徴とする請求項１〜４のいずれか１項に記載の撮像装置。 The sealing member has a protrusion facing the image sensor,
The protrusion is separated from the image sensor in a normal state where no force from the subject side is applied to the optical member, and when a predetermined force or more from the subject side is applied to the optical member, The imaging apparatus according to claim 1, wherein the imaging apparatus is in contact with the imaging apparatus. 前記封止部材は、被写体光を通過させるための矩形の開口部を有し、
前記突起部は、前記開口部の２つの長辺の各々に対応して設けられ、対応する長辺の略中央近傍に位置することを特徴とする請求項７に記載の撮像装置。 The sealing member has a rectangular opening for allowing subject light to pass through;
The imaging device according to claim 7, wherein the protrusion is provided corresponding to each of the two long sides of the opening, and is positioned in the vicinity of the center of the corresponding long side. 前記第１の当接部は、前記第１の当接部に対応して前記支持部材に形成された凹状部に当接することを特徴とする請求項１〜８のいずれか１項に記載の撮像装置。   The said 1st contact part contacts the recessed part formed in the said supporting member corresponding to the said 1st contact part, The any one of Claims 1-8 characterized by the above-mentioned. Imaging device. 前記封止部材の外周部には被写体側に突出した突条部が形成され、
前記突条部は前記保持部材に対して入れ子状態となっていることを特徴とする請求項１〜９のいずれか１項に記載の撮像装置。 On the outer peripheral portion of the sealing member, a ridge protruding to the subject side is formed,
The imaging device according to claim 1, wherein the protrusion is nested with respect to the holding member.
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