JP4360244B2 - Imaging device - Google Patents

Imaging device Download PDF

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JP4360244B2
JP4360244B2 JP2004091481A JP2004091481A JP4360244B2 JP 4360244 B2 JP4360244 B2 JP 4360244B2 JP 2004091481 A JP2004091481 A JP 2004091481A JP 2004091481 A JP2004091481 A JP 2004091481A JP 4360244 B2 JP4360244 B2 JP 4360244B2
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flexible substrate
lens barrel
opening
imaging
fixed
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JP2005278033A (en
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裕彦 伊奈
新 坂本
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Description

本発明は、デジタルスチルカメラ（以下、「電子カメラ」という。）に備えられている撮像装置に関し、詳しくは、レンズを内蔵した鏡筒、光電変換する撮像素子、そして鏡筒と撮像素子とを各面に実装するフレキシブル配線基板（以下、「フレキシブル基板」という。）などを備えた撮像装置に関する。   The present invention relates to an image pickup apparatus provided in a digital still camera (hereinafter referred to as an “electronic camera”), and more specifically, a lens barrel with a built-in lens, an image pickup device that performs photoelectric conversion, and a lens barrel and an image pickup device. The present invention relates to an imaging apparatus including a flexible wiring board (hereinafter referred to as “flexible board”) mounted on each surface.

被写体像を撮像素子によって光電変換し、電気信号に変換された画像データを記録媒体に記録したり、液晶画面などの表示部に映し出したりするようにした電子カメラが各種提供されている。そして、携帯電話機や情報端末機などに備えられている電子カメラには、小型化・薄形化を図った撮像装置が内蔵されている。このように小型化・薄型化を図った撮像装置として、開口を有するフレキシブル基板の一方側の面に撮像素子を、他方側の面にレンズ等の光学系を備える鏡筒をそれぞれ配置したものが知られている。具体的には以下に示すようなものがある。   Various electronic cameras have been provided in which a subject image is photoelectrically converted by an image sensor and image data converted into an electrical signal is recorded on a recording medium or displayed on a display unit such as a liquid crystal screen. An electronic camera provided in a cellular phone, an information terminal, or the like has a built-in imaging device that is reduced in size and thickness. In this way, as an imaging device that is reduced in size and thickness, an imaging device is disposed on one surface of a flexible substrate having an opening, and a lens barrel including an optical system such as a lens is disposed on the other surface. Are known. Specific examples include the following.

例えば、特許文献１には、図３に示すような撮像装置が開示されている。この撮像装置は、鏡筒１を有するカメラ本体２と、鏡筒１内に備えられたレンズ３と、カメラ本体２内に組み付けられた撮像素子ユニット４とを備えている。   For example, Patent Document 1 discloses an imaging apparatus as shown in FIG. The imaging apparatus includes a camera body 2 having a lens barrel 1, a lens 3 provided in the lens barrel 1, and an image sensor unit 4 assembled in the camera body 2.

撮像素子ユニット４は、薄板状の光学ガラスのような透光性部材５、開口部６を形成し、かつ、配線パターンをプリントした平板状のフレキシブル基板７、ＣＣＤやＣＭＯＳなどの撮像素子８などから構成され、透光性部材５が開口部６を塞ぐようにフレキシブル基板７の表面に実装され、撮像素子８が開口部６を塞ぐようにフレキシブル基板７の裏面に実装されている。ただし、この撮像素子ユニット４は、撮像素子８の表面の受光部（不図示）と透光性部材５とが対向し、撮像素子８のバンプ電極とフレキシブル基板７の配線パターンとが接続されるように、撮像素子８の外周部がフレキシブル基板７の開口部６の周囲に固定されている。   The image sensor unit 4 includes a light-transmissive member 5 such as a thin plate-shaped optical glass, an opening 6 and a flat flexible substrate 7 on which a wiring pattern is printed, an image sensor 8 such as a CCD or CMOS, and the like. The translucent member 5 is mounted on the surface of the flexible substrate 7 so as to close the opening 6, and the imaging element 8 is mounted on the back surface of the flexible substrate 7 so as to close the opening 6. However, in this imaging element unit 4, the light receiving portion (not shown) on the surface of the imaging element 8 and the translucent member 5 face each other, and the bump electrode of the imaging element 8 and the wiring pattern of the flexible substrate 7 are connected. As described above, the outer periphery of the image sensor 8 is fixed around the opening 6 of the flexible substrate 7.

このような撮像素子ユニット４は、フレキシブル基板７の表面が鏡筒１におけるレンズ３の取り付け位置の反対側（以下「奥側」という。）端面に接合してカメラ本体２内に組み付けられる。フレキシブル基板７には、位置決め穴９，９が２か所に形成され、鏡筒１の奥側端面には、突起１０とピン挿入穴１１とが形成されている。そして、フレキシブル基板７の一方の位置決め穴９と鏡筒１の奥側端面の突起１０とが係合し、フレキシブル基板７の他方の位置決め穴９と鏡筒１の奥側端面のピン挿入穴１１とが位置合わせされ、ピン１２が挿入されることにより、撮像素子ユニット４は、鏡筒１の奥側端面に固定される。   Such an image sensor unit 4 is assembled in the camera body 2 with the surface of the flexible substrate 7 bonded to the end surface of the lens barrel 1 opposite to the lens 3 mounting position (hereinafter referred to as “back side”). Positioning holes 9 and 9 are formed in two places on the flexible substrate 7, and a protrusion 10 and a pin insertion hole 11 are formed on the back end face of the lens barrel 1. Then, one positioning hole 9 of the flexible substrate 7 is engaged with the projection 10 on the back end surface of the lens barrel 1, and the other positioning hole 9 of the flexible substrate 7 and the pin insertion hole 11 on the back end surface of the lens barrel 1 are engaged. Are aligned and the pin 12 is inserted, whereby the image pickup device unit 4 is fixed to the rear end surface of the lens barrel 1.

また、特許文献２には、図４に示すような撮像装置が開示されている。この撮像装置は、開口部１３を形成し、かつ、配線パターンをプリントしたフレキシブル基板１４、ＣＣＤやＣＭＯＳなどの撮像素子１５、ガラスなどの透光性部材１６、レンズ１７を内蔵した鏡筒１８などから構成され、前記撮像素子１５が開口部１３を塞ぐようにフレキシブル基板１４の裏面に実装され、透光性部材１６が開口部１３を塞ぐようにフレキシブル基板１４の表面に実装され、さらに、鏡筒１８の端面が透光性部材１６に固着されている。   Patent Document 2 discloses an imaging apparatus as shown in FIG. This imaging apparatus includes an opening 13 and a flexible substrate 14 on which a wiring pattern is printed, an imaging element 15 such as a CCD or CMOS, a translucent member 16 such as glass, a lens barrel 18 incorporating a lens 17 and the like. The imaging element 15 is mounted on the back surface of the flexible substrate 14 so as to close the opening 13, the translucent member 16 is mounted on the surface of the flexible substrate 14 so as to close the opening 13, and a mirror. An end surface of the cylinder 18 is fixed to the translucent member 16.

ただし、撮像素子１５の表面の受光部（不図示）と前記透光性部材１６の裏面とが開口部１３で対向し、撮像素子１５のバンプ電極とフレキシブル基板１４の配線パターンとが接続されるとともに、撮像素子１５と透光性部材１６とが接着剤１９によってフレキシブル基板１４に固定されている。そして、透光性部材１６の表面の３か所には凹形状などの接着剤配置領域２０が形成され、他方、鏡筒１８の端面の３か所には基準凸部２１が設けられている。そして、接着剤配置領域２０には接着剤１９が塗布された後、鏡筒１８の端面に設けられた基準凸部２１が透光性部材１６に形成された接着剤配置領域２０に位置し、接着剤１９が硬化することによって透光性部材１６と鏡筒１８とが固着される。   However, the light receiving portion (not shown) on the front surface of the image sensor 15 and the back surface of the translucent member 16 face each other at the opening 13 so that the bump electrodes of the image sensor 15 and the wiring pattern of the flexible substrate 14 are connected. At the same time, the imaging element 15 and the translucent member 16 are fixed to the flexible substrate 14 with an adhesive 19. An adhesive placement region 20 having a concave shape or the like is formed at three locations on the surface of the translucent member 16, while reference convex portions 21 are provided at three locations on the end surface of the lens barrel 18. . Then, after the adhesive 19 is applied to the adhesive placement region 20, the reference convex portion 21 provided on the end surface of the lens barrel 18 is located in the adhesive placement region 20 formed on the translucent member 16. The translucent member 16 and the lens barrel 18 are fixed by curing the adhesive 19.

そして、いずれの撮像装置にあっても、被写体像の光が鏡筒１，１８内のレンズ３，１７と透光性部材５，１６とを透過して撮像素子８，１５の表面の受光部（不図示）で受光され、撮像素子８，１５によって光電変換される。鏡筒１，１８の光軸と撮像素子８，１５の光軸（撮像素子の表面の垂線）とが一致していないと、実際の被写体像と異なるように光電変換され、記録および表示される画質が低下する。したがって、撮像装置は、鏡筒１，１８の光軸と撮像素子８，１５の光軸とが一致するように製造されている。
特開２００２−２１８２９３号公報（図５） 特開２００２−１５２６０６号公報（図２） In any imaging device, the light of the subject image is transmitted through the lenses 3 and 17 and the translucent members 5 and 16 in the lens barrels 1 and 18 and the light receiving portions on the surfaces of the imaging elements 8 and 15. The light is received by (not shown) and photoelectrically converted by the image sensors 8 and 15. If the optical axes of the lens barrels 1 and 18 and the optical axes of the image sensors 8 and 15 (perpendicular to the surface of the image sensor) do not coincide with each other, photoelectric conversion is performed so as to differ from the actual subject image, and recording and display are performed. The image quality is degraded. Therefore, the imaging device is manufactured so that the optical axes of the lens barrels 1 and 18 and the optical axes of the imaging elements 8 and 15 coincide.
JP 2002-218293 A (FIG. 5) JP 2002-152606 A (FIG. 2)

特許文献１に開示された撮像装置では、鏡筒１の奥側端面が鏡筒１の光軸と直角に形成されており、撮像素子８を実装したフレキシブル基板７が鏡筒１の奥側端面に接合して固定されることにより、撮像素子８の表面は鏡筒１の奥側端面と平行となり、撮像素子８の光軸と鏡筒１の光軸とが一致するようになっている。   In the imaging device disclosed in Patent Document 1, the back end surface of the lens barrel 1 is formed at right angles to the optical axis of the lens barrel 1, and the flexible substrate 7 on which the image sensor 8 is mounted is the back end surface of the lens barrel 1. The surface of the image sensor 8 is parallel to the back end face of the lens barrel 1 and the optical axis of the image sensor 8 and the optical axis of the lens barrel 1 coincide with each other.

しかし、フレキシブル基板７は柔軟性を有しているため、撮像素子８をフレキシブル基板７に実装した後に、フレキシブル基板７を鏡筒１の奥側端面に固定すると、温度変化や外部からの振動・衝撃などによりフレキシブル基板７がわずかに撓むなど変形し、撮像素子８の表面が鏡筒１の奥側端面と平行にならず、撮像素子８の光軸と鏡筒１の光軸とが一致しなくなることが懸念される。   However, since the flexible substrate 7 has flexibility, when the flexible substrate 7 is fixed to the back end surface of the lens barrel 1 after mounting the imaging element 8 on the flexible substrate 7, temperature change and external vibration / The flexible substrate 7 is deformed, for example, slightly bent by an impact or the like, and the surface of the image sensor 8 is not parallel to the back end surface of the lens barrel 1, so that the optical axis of the image sensor 8 and the optical axis of the lens barrel 1 are equal. I am concerned that I will not do it.

また、特許文献２に開示された撮像装置では、フレキシブル基板１４の裏面に撮像素子１５が実装され、フレキシブル基板１４の表面に透光性部材１６が実装されることから、撮像素子１５と透光性部材１６とは平行に配置されている。したがって、鏡筒１８の端面が透光性部材１６と平行に固着されることにより、撮像素子１５の光軸と鏡筒１８の光軸は一致するようになっている。   Further, in the imaging device disclosed in Patent Document 2, the imaging element 15 is mounted on the back surface of the flexible substrate 14 and the translucent member 16 is mounted on the surface of the flexible substrate 14. The sex member 16 is arranged in parallel. Therefore, the end surface of the lens barrel 18 is fixed in parallel with the translucent member 16 so that the optical axis of the image pickup device 15 and the optical axis of the lens barrel 18 coincide with each other.

しかし、鏡筒１８は、透光性部材１６の表面に塗布された接着剤１９の表面張力によって所定の位置に配置され、接着剤１９が硬化することによって透光性部材１６に固着されるため、鏡筒１８の光軸と撮像素子１５の光軸とを一致させ、その後に接着剤１９を硬化させるという作業が別途必要となり、手間がかかり面倒である。   However, the lens barrel 18 is disposed at a predetermined position by the surface tension of the adhesive 19 applied to the surface of the translucent member 16, and is fixed to the translucent member 16 when the adhesive 19 is cured. The optical axis of the lens barrel 18 and the optical axis of the image pickup device 15 are made to coincide with each other, and then the adhesive 19 is cured, which is troublesome and cumbersome.

そこで、本発明は、撮像素子の光軸と鏡筒の光軸とが容易、かつ、確実に一致するように製造される撮像装置を提供することを課題とする。   Therefore, an object of the present invention is to provide an imaging device manufactured so that the optical axis of the imaging element and the optical axis of the lens barrel are easily and reliably matched.

本発明に係る撮像装置は、開口部を設けたフレキシブル基板と、表面に受光部を有する撮像素子と、入射光を前記撮像素子の受光部に結像するための光学系を内蔵しかつ該光学系における光軸に対して直角な端面を形成した筒状の鏡筒とを少なくとも備え、前記撮像素子の受光部が前記開口部と対向するように撮像素子がフレキシブル基板の一方の面に接続・固定され、前記鏡筒が前記開口部を囲むように鏡筒の端面がフレキシブル基板の他方の面に固定され、前記鏡筒の端面と前記撮像素子の表面とが少なくとも一部分においてフレキシブル基板を挟む状態となっている撮像装置であって、前記撮像素子は、前記開口部の一部分に隙間が設けられるように前記フレキシブル基板の一方の面に固定され、前記鏡筒の端面には、前記隙間から前記フレキシブル基板の一方の面に突出し前記撮像素子の側面に沿う形で位置する突出部が形成され、前記撮像素子が接着剤によって前記突出部に固定されていることを特徴としている。 An image pickup apparatus according to the present invention includes a flexible substrate having an opening, an image pickup element having a light receiving part on the surface, and an optical system for imaging incident light on the light receiving part of the image pickup element. comprising at least a cylindrical barrel forming a perpendicular end face with respect to the optical axis in the system, the image pickup device so that the light receiving portion is opposed to the opening of the front SL imaging device connected to the one surface of the flexible substrate The end surface of the lens barrel is fixed to the other surface of the flexible substrate so that the lens barrel surrounds the opening, and the end surface of the lens barrel and the surface of the imaging element sandwich the flexible substrate at least partially. an imaging device that has become a state, the imaging device is fixed to said one surface of the flexible substrate so that a gap is provided in a portion of the opening, the end face of the barrel, through the gap in front Protruding portions located in line with the side surface of projecting the image sensor is formed on one surface of the flexible substrate, wherein the imaging device is characterized in that it is secured to the protrusion by an adhesive.

この撮像装置によれば、撮像素子と鏡筒の端面とがフレキシブル基板を両面から挟む状態となっており、フレキシブル基板の両面が平行に形成されているため、撮像素子と鏡筒の端面とは平行となる。そして、鏡筒の端面が鏡筒の光軸に対して直角に形成されていることから、フレキシブル基板の柔軟性に影響されず、撮像素子の光軸と鏡筒の光軸とを容易、かつ、確実に一致させることができる。なお、撮像素子が開口部を塞ぐようにフレキシブル基板の一方の面に固定され、鏡筒が開口部を囲むように鏡筒の端面がフレキシブル基板の他の面に固定されるため、撮像素子の受光部と鏡筒に内蔵されたレンズとが対向する。   According to this imaging apparatus, since the imaging element and the end surface of the lens barrel sandwich the flexible substrate from both sides, and both surfaces of the flexible substrate are formed in parallel, the imaging element and the end surface of the lens barrel are Parallel. And since the end surface of the lens barrel is formed at right angles to the optical axis of the lens barrel, the optical axis of the imaging element and the optical axis of the lens barrel can be easily and without being affected by the flexibility of the flexible substrate, and Can be matched, surely. Note that the image sensor is fixed to one surface of the flexible substrate so as to close the opening, and the end surface of the lens barrel is fixed to the other surface of the flexible substrate so that the lens tube surrounds the opening. The light receiving unit and the lens built in the lens barrel face each other.

また、フレキシブル基板の開口部の一部分に撮像素子によって塞がれない隙間が設けられ、この隙間から鏡筒の端面に突設された突出部がフレキシブル基板の一方の面へ突出し、撮像素子の側面に沿う形で位置する状態となる。この突出部と撮像素子とが接着剤によって固定されることにより、撮像素子がフレキシブル基板から外れないように固定される。
 In addition, a gap that is not blocked by the image sensor is provided in a part of the opening of the flexible substrate, and a projecting portion that projects from the gap to the end surface of the lens barrel projects to one surface of the flexible substrate, and the side surface of the image sensor It will be in the state located in the form along. By fixing the protrusion and the image sensor with an adhesive, the image sensor is fixed so as not to be detached from the flexible substrate.

また、前記撮像装置において、前記鏡筒内には透光性部材が設置されていてもよい。   In the imaging apparatus, a translucent member may be installed in the lens barrel.

この撮像装置によれば、必要に応じて適宜透光性部材を設置することができる。なお、透光性部材としては、例えばガラス板などの他、赤外線カットフィルタやバンドパスフィルタなどの光学フィルタを採用することができる。透光性部材の配置位置は、例えば、レンズとフレキシブル基板との間に設置することが考えられる。   According to this imaging apparatus, a translucent member can be appropriately installed as necessary. In addition, as a translucent member, optical filters, such as an infrared cut filter and a band pass filter, other than a glass plate etc. are employable, for example. For example, the translucent member may be disposed between the lens and the flexible substrate.

また、前記と異なる本発明に係る撮像装置は、開口部を設けたフレキシブル基板と、表面に受光部を有し前記開口部よりも大きな撮像素子と、前記開口部よりも大きく、かつ、正面と背面とが平行に形成された透光性部材と、入射光を前記撮像素子の受光部に結像するための光学系を内蔵しかつ該光学系における光軸に対して直角な端面を形成した筒状の鏡筒とを少なくとも備える撮像装置であって、前記撮像素子の受光部が前記開口部と対向するとともに前記撮像素子が前記開口部を塞ぐように撮像素子がフレキシブル基板の一方の面に接続・固定され、前記透光性部材の背面が前記開口部を塞ぐように透光性部材がフレキシブル基板の他方の面に固定され、前記鏡筒の端面が前記透光性部材の正面の周縁部に接合するとともに前記鏡筒が前記透光性部材を囲むようにフレキシブル基板の他方の面に固定され、前記透光性部材の背面と前記撮像素子の表面とが少なくとも一部分においてフレキシブル基板を挟む状態となっていることを特徴としている。   Further, an imaging apparatus according to the present invention different from the above includes a flexible substrate provided with an opening, a light receiving unit on the surface, an imaging element larger than the opening, a larger than the opening, and a front surface. A translucent member formed in parallel with the back surface and an optical system for imaging incident light on the light receiving portion of the image sensor, and an end surface perpendicular to the optical axis in the optical system was formed. An imaging apparatus including at least a cylindrical barrel, wherein the imaging element is disposed on one surface of the flexible substrate so that a light receiving portion of the imaging element faces the opening and the imaging element closes the opening. Connected and fixed, the translucent member is fixed to the other surface of the flexible substrate so that the back surface of the translucent member closes the opening, and the end surface of the barrel is the peripheral edge of the front surface of the translucent member And the lens barrel The light-transmitting member is fixed to the other surface of the flexible substrate so as to surround the light-transmitting member, and the back surface of the light-transmitting member and the surface of the imaging element are in a state of sandwiching the flexible substrate at least partially. Yes.

この撮像装置によれば、撮像素子と透光性部材とがフレキシブル基板を両面から挟む状態となっており、フレキシブル基板の両面が平行に形成されているため、撮像素子と透光性部材の背面とは平行に配置される。また、透光性部材の正面と背面とが平行に形成されているため、透光性部材の周縁部に接合した鏡筒の端面と撮像素子とも平行となる。そして、鏡筒の端面が鏡筒の光軸に対して直角に形成されていることから、フレキシブル基板の柔軟性に影響されず、撮像素子の光軸と鏡筒の光軸とを容易、かつ、確実に一致させることができる。そして、撮像素子の受光部の周辺がフレキシブル基板の一方の面と接合するため、フレキシブル基板が遮光部材として作用し、光の乱反射が抑えられ、撮像素子は被写体像の光のみ受光することができるようになる。なお、鏡筒の端面が透光性部材と接合し、フレキシブル基板から離隔していても、鏡筒はフレキシブル基板に接着剤等により固定されることにより、フレキシブル基板から外れにくいようになっている。   According to this imaging apparatus, the imaging element and the translucent member are in a state of sandwiching the flexible substrate from both sides, and both sides of the flexible substrate are formed in parallel. Are arranged in parallel. Moreover, since the front surface and the back surface of the translucent member are formed in parallel, the end surface of the lens barrel joined to the peripheral edge of the translucent member and the image sensor are also in parallel. And since the end surface of the lens barrel is formed at right angles to the optical axis of the lens barrel, the optical axis of the imaging element and the optical axis of the lens barrel can be easily and without being affected by the flexibility of the flexible substrate, and Can be matched, surely. Since the periphery of the light receiving portion of the image sensor is joined to one surface of the flexible substrate, the flexible substrate acts as a light shielding member, suppressing light irregular reflection, and the image sensor can receive only the light of the subject image. It becomes like this. In addition, even if the end surface of the lens barrel is joined to the translucent member and separated from the flexible substrate, the lens barrel is fixed to the flexible substrate with an adhesive or the like so that it is difficult to come off the flexible substrate. .

また、前記撮像装置において、前記フレキシブル基板には、係合穴が２か所以上形成され、前記鏡筒の端面には、前記係合穴と係合する突起が設けられていてもよい。   In the imaging apparatus, two or more engagement holes may be formed in the flexible substrate, and a protrusion that engages with the engagement hole may be provided on an end surface of the barrel.

この撮像装置によれば、フレキシブル基板に設けられた係合穴と鏡筒の端面に設けられた突起とが係合することにより、鏡筒がフレキシブル基板の所定の位置に容易、かつ、正確に位置決めされ、固定することができる。   According to this imaging apparatus, the engagement hole provided in the flexible substrate and the protrusion provided on the end surface of the lens barrel engage with each other, so that the lens barrel can be easily and accurately positioned at a predetermined position on the flexible substrate. Can be positioned and fixed.

本発明によれば、撮像素子と鏡筒とがフレキシブル基板を挟み、あるいは、撮像素子と鏡筒とが透光性部材を介してフレキシブル基板を挟む状態で固定されるため、撮像素子と鏡筒の端面とが平行になり、フレキシブル基板の柔軟性に影響されず、撮像素子の光軸と鏡筒の光軸とを容易、かつ、確実に一致させることができる。したがって、撮像装置の生産性が向上し、この撮像装置を備えた電子カメラのコストダウンを図ることができる。   According to the present invention, since the imaging device and the lens barrel sandwich the flexible substrate, or the imaging device and the lens barrel are fixed with the flexible substrate sandwiched via the translucent member, the imaging device and the lens barrel are fixed. Therefore, the optical axis of the imaging element and the optical axis of the lens barrel can be easily and reliably matched without being affected by the flexibility of the flexible substrate. Accordingly, the productivity of the imaging device is improved, and the cost of an electronic camera equipped with this imaging device can be reduced.

さらに、撮像素子の光軸と鏡筒の光軸とを確実に一致させることができるため、鏡筒内のレンズを透過した被写体像の光は、撮像素子によって正確に光電変換され、画像データが高品質に記録媒体に記録され、また、表示部に映し出されるようになる。   Furthermore, since the optical axis of the image sensor and the optical axis of the lens barrel can be reliably matched, the light of the subject image transmitted through the lens in the lens barrel is accurately photoelectrically converted by the image sensor, and the image data is It is recorded on the recording medium with high quality and is displayed on the display unit.

（実施の形態１）
本発明に係る撮像装置の第１の実施形態について図１を参照しながら説明する。第１の実施形態における撮像装置は、図１に示すように、フレキシブル基板２２と撮像素子２３と鏡筒２４とが備えられている。 (Embodiment 1)
A first embodiment of an imaging apparatus according to the present invention will be described with reference to FIG. As shown in FIG. 1, the imaging apparatus according to the first embodiment includes a flexible substrate 22, an imaging element 23, and a lens barrel 24.

フレキシブル基板２２は、配線パターン（図示せず）がプリントされ、そして１か所に四角形状の開口部２５が形成されている。そして、この開口部２５よりも大きな四角形状の開口部２６を有する四角形状の補強板２７がフレキシブル基板２２の一方の面（以下、「裏面」という。）２８に貼り合わされている。補強板２７は、ポリイミドやポリエステルなどによって成形され、フレキシブル基板２２の開口部２５の周囲に貼り合わされることにより、この部分のフレキシブル基板２２を補強している。   The flexible substrate 22 is printed with a wiring pattern (not shown), and a rectangular opening 25 is formed at one place. A rectangular reinforcing plate 27 having a rectangular opening 26 larger than the opening 25 is bonded to one surface (hereinafter referred to as “back surface”) 28 of the flexible substrate 22. The reinforcing plate 27 is formed of polyimide, polyester, or the like, and is bonded around the opening 25 of the flexible substrate 22 to reinforce this portion of the flexible substrate 22.

そして、フレキシブル基板２２の開口部２５の幅は、一方が補強板２７の開口部２６の幅と同じとされ、他方が補強板２７の開口部２６の幅より短くされている。このようにフレキシブル基板２２の開口部２５の他方の幅が補強板２７の開口部２６の幅よりも短くされることにより、この部分のフレキシブル基板２２の裏面２８が補強板２７の開口部２６内で露出する。   The width of the opening 25 of the flexible substrate 22 is the same as the width of the opening 26 of the reinforcing plate 27 and the other is shorter than the width of the opening 26 of the reinforcing plate 27. Thus, the other width of the opening 25 of the flexible substrate 22 is made shorter than the width of the opening 26 of the reinforcing plate 27, so that the back surface 28 of this portion of the flexible substrate 22 is within the opening 26 of the reinforcing plate 27. Exposed.

そして、フレキシブル基板２２と補強板２７とが重なり合っている部分の所定の２か所に係合穴２９，２９が形成されている。ただし、係合穴２９は、配線パターンの邪魔にならなければ、任意の場所に３か所以上形成してもよい。   Engagement holes 29 and 29 are formed at two predetermined locations where the flexible substrate 22 and the reinforcing plate 27 overlap. However, three or more engagement holes 29 may be formed at arbitrary locations as long as they do not interfere with the wiring pattern.

そして、撮像素子２３は、一方の面（以下、「表面」という。）４７にＣＣＤやＣＭＯＳなどからなる受光部３１を備え、長方形状に形成されている。この撮像素子２３の短辺は、前記フレキシブル基板２２と補強板２７の両開口部２５，２６の幅よりも短くされ、そして、撮像素子２３の長辺は、前記フレキシブル基板２２の開口部２５の他方の幅よりも長く、かつ、補強板２７の開口部２６の他方の幅よりも短くされている。撮像素子２３がこのようなサイズとされることにより、開口部２５，２６に一対の隙間３０，３０が設けられるとともに、撮像素子２３が開口部２５，２６を塞ぎ、そして、撮像素子２３の表面４７上の対向する両短辺に形成されたバンプ電極と、露出しているフレキシブル基板２２の裏面２８にプリントされた配線パターンとが接続される。   The image pickup device 23 includes a light receiving portion 31 made of a CCD, a CMOS, or the like on one surface (hereinafter referred to as “surface”) 47 and is formed in a rectangular shape. The short side of the image sensor 23 is shorter than the widths of the openings 25 and 26 of the flexible substrate 22 and the reinforcing plate 27, and the long side of the image sensor 23 is the opening 25 of the flexible substrate 22. It is longer than the other width and shorter than the other width of the opening 26 of the reinforcing plate 27. With the image sensor 23 having such a size, a pair of gaps 30 and 30 are provided in the openings 25 and 26, the image sensor 23 closes the openings 25 and 26, and the surface of the image sensor 23. The bump electrodes formed on both short sides facing each other on 47 are connected to the wiring pattern printed on the exposed back surface 28 of the flexible substrate 22.

この接続は、一旦、撮像素子２３を平坦な部材（不図示）に押さえ付けてバンプ電極の先端の高さを均等にしてから行うことにより、フレキシブル基板２２の裏面２８と撮像素子２３とが平行に配置されるようになる。   This connection is made after the image pickup device 23 is once pressed against a flat member (not shown) and the heights of the bump electrodes are made uniform, so that the back surface 28 of the flexible substrate 22 and the image pickup device 23 are parallel to each other. Will be placed in.

そして、フレキシブル基板２２の他方の面（以下、「表面」という。）３２には鏡筒２４が固定される。鏡筒２４は、フレキシブル基板２２の開口部２５を囲むように表面３２に固定される固定部３３と、レンズ３４を内蔵する円筒状のレンズホルダ３５とを結合した構成とされている。   The lens barrel 24 is fixed to the other surface (hereinafter referred to as “surface”) 32 of the flexible substrate 22. The lens barrel 24 has a configuration in which a fixing portion 33 fixed to the surface 32 so as to surround the opening portion 25 of the flexible substrate 22 and a cylindrical lens holder 35 containing a lens 34 are combined.

固定部３３がフレキシブル基板２２の表面３２と接合する端面３６は、鏡筒２４の光軸に対して直角に形成されている。この端面３６には、前記フレキシブル基板２２と補強板２７とに形成された係合穴２９，２９に係合する一対の突起３７，３７が突設されている。さらに、鏡筒２４の端面３６には、鏡筒２４の内周側に向けて突出する長方形枠状の鍔部３８が形成されている。   An end face 36 where the fixing portion 33 is joined to the surface 32 of the flexible substrate 22 is formed at right angles to the optical axis of the lens barrel 24. On the end surface 36, a pair of projections 37, 37 are provided so as to engage with engagement holes 29, 29 formed in the flexible substrate 22 and the reinforcing plate 27. Furthermore, a rectangular frame-shaped flange portion 38 that protrudes toward the inner peripheral side of the lens barrel 24 is formed on the end surface 36 of the lens barrel 24.

この鍔部３８の外面には、前記撮像素子２３の短辺よりも広い間隔で、前記隙間３０，３０から突出する一対の凸状の突出部３９，３９が設けられている。そして、鍔部３８の内面には、わずかに低くなった段差部が形成され、この段差部に長方形状の光学フィルタ４０の外周部が嵌め込まれる。光学フィルタ４０は、赤外線カットフィルタやバンドパスフィルタなどが使用されるが、防塵用に透明なガラス板を貼り付けるようにしてもよいし、省略してもよい。   On the outer surface of the flange portion 38, a pair of convex projecting portions 39, 39 projecting from the gaps 30, 30 are provided at intervals wider than the short side of the image sensor 23. Then, a slightly lowered step portion is formed on the inner surface of the flange portion 38, and the outer peripheral portion of the rectangular optical filter 40 is fitted into this step portion. As the optical filter 40, an infrared cut filter, a bandpass filter, or the like is used, but a transparent glass plate may be attached for dust prevention or may be omitted.

一方、鏡筒２４の固定部３３の先端側は、内面に雌ネジを形成した円筒状に形成されている。そして、この雌ネジと螺合する雄ネジがレンズホルダ３５の外面に形成されている。レンズホルダ３５内には、レンズ３４が保持されており、さらに、レンズホルダ３５の先端部には、レンズ３４に入射する光量を調整する絞り４１が形成されている。そして、レンズ３４を透過した撮像光が撮像素子２３の受光部３１で結像するように、レンズホルダ３５の基端部が固定部３３内周に螺合され、位置合わせされる。   On the other hand, the distal end side of the fixing portion 33 of the lens barrel 24 is formed in a cylindrical shape with an internal thread formed on the inner surface. A male screw that engages with the female screw is formed on the outer surface of the lens holder 35. A lens 34 is held in the lens holder 35, and a stop 41 for adjusting the amount of light incident on the lens 34 is formed at the tip of the lens holder 35. Then, the base end portion of the lens holder 35 is screwed to the inner periphery of the fixing portion 33 so that the imaging light transmitted through the lens 34 is imaged by the light receiving portion 31 of the imaging device 23 and is aligned.

ただし、この位置合わせは、鏡筒２４をフレキシブル基板２２の裏面２８に固定した後に行われる。すなわち、鏡筒２４の突起３７，３７がフレキシブル基板２２と補強板２７に形成された係合穴２９，２９と係合するように、鏡筒２４の端面３６をフレキシブル基板２２の表面３２に接合する。このとき、鏡筒２４の突出部３９，３９が隙間３０，３０からフレキシブル基板２２の裏面２８に突出し、フレキシブル基板２２の裏面２８に接続・固定された撮像素子２３を両側面から挟む状態となる。そして、撮像素子２３を接着剤４２によって鏡筒２４の突出部３９，３９に固定する。さらに、鏡筒２４の固定部３３の外周も接着剤４２によってフレキシブル基板２２の表面３２に固定する。   However, this alignment is performed after the lens barrel 24 is fixed to the back surface 28 of the flexible substrate 22. That is, the end surface 36 of the lens barrel 24 is joined to the surface 32 of the flexible substrate 22 so that the projections 37 and 37 of the lens barrel 24 engage with the engagement holes 29 and 29 formed in the flexible substrate 22 and the reinforcing plate 27. To do. At this time, the protruding portions 39 and 39 of the lens barrel 24 protrude from the gaps 30 and 30 to the back surface 28 of the flexible substrate 22, and the imaging element 23 connected and fixed to the back surface 28 of the flexible substrate 22 is sandwiched from both sides. . Then, the image pickup device 23 is fixed to the protruding portions 39 and 39 of the lens barrel 24 with an adhesive 42. Further, the outer periphery of the fixing portion 33 of the lens barrel 24 is also fixed to the surface 32 of the flexible substrate 22 by the adhesive 42.

このようにフレキシブル基板２２の裏面２８と表面３２とに撮像素子２３と鏡筒２４とをそれぞれ固定した撮像装置は、撮像素子２３の表面４７と鏡筒２４の端面３６とがフレキシブル基板２２を挟む状態となる。フレキシブル基板２２の裏面２８と表面３２とは、平行であるため、撮像素子２３の表面と鏡筒２４の端面３６とは平行に対向する。このように、この撮像装置は、鏡筒２４の端面３６が光軸に対して直角に形成されているため、撮像素子２３の光軸と鏡筒２４の光軸とを容易、かつ、確実に一致させて製造することができる。
（実施の形態２）
本発明に係る撮像装置の第２の実施形態について図２を参照しながら説明する。第２の実施形態に係る撮像装置は、図２に示すように、フレキシブル基板２２と撮像素子２３と鏡筒２４と透光性部材４３とが備えられている。 As described above, in the imaging apparatus in which the imaging device 23 and the lens barrel 24 are fixed to the back surface 28 and the front surface 32 of the flexible substrate 22, the surface 47 of the imaging device 23 and the end surface 36 of the lens barrel 24 sandwich the flexible substrate 22. It becomes a state. Since the back surface 28 and the front surface 32 of the flexible substrate 22 are parallel to each other, the front surface of the imaging device 23 and the end surface 36 of the lens barrel 24 face each other in parallel. Thus, in this imaging apparatus, since the end surface 36 of the lens barrel 24 is formed at right angles to the optical axis, the optical axis of the imaging device 23 and the optical axis of the lens barrel 24 can be easily and reliably established. Can be made to match.
(Embodiment 2)
A second embodiment of the imaging apparatus according to the present invention will be described with reference to FIG. As shown in FIG. 2, the imaging apparatus according to the second embodiment includes a flexible substrate 22, an imaging element 23, a lens barrel 24, and a translucent member 43.

フレキシブル基板２２は、第１の実施形態と同じであり、開口部２５を形成した部分の裏面２８に補強板２７が貼り合わされ、係合穴２９，２９が形成されている。ただし、第２の実施形態においては、第１の実施形態と異なり、補強板２７の開口部２６の幅は、フレキシブル基板２２の開口部２５の幅よりも全て大きく、フレキシブル基板２２の裏面が開口部２５で四辺とも露出するようになっている。   The flexible substrate 22 is the same as that of the first embodiment, and a reinforcing plate 27 is bonded to the back surface 28 of the portion where the opening 25 is formed, and engagement holes 29 and 29 are formed. However, in the second embodiment, unlike the first embodiment, the width of the opening 26 of the reinforcing plate 27 is all larger than the width of the opening 25 of the flexible substrate 22, and the back surface of the flexible substrate 22 is open. All four sides are exposed at the portion 25.

また、撮像素子２３も第１の実施形態と同じであり、表面４７にバンプ電極が形成されている。ただし、第２の実施形態にあっては、撮像素子２３はフレキシブル基板２２の開口部２５を完全に塞ぎ、隙間３０が設けられないようにフレキシブル基板２２の裏面２８に接続・固定されている。フレキシブル基板２２の裏面２８は、開口部２５の四辺で露出しており、撮像素子２３は表面４７の四辺にバンプ電極が形成されている。   The image sensor 23 is also the same as that of the first embodiment, and a bump electrode is formed on the surface 47. However, in the second embodiment, the image sensor 23 is connected and fixed to the back surface 28 of the flexible substrate 22 so as to completely close the opening 25 of the flexible substrate 22 and not to provide the gap 30. The back surface 28 of the flexible substrate 22 is exposed at the four sides of the opening 25, and the image sensor 23 has bump electrodes formed on the four sides of the surface 47.

また、透光性部材４３は、正面４４と背面４５とが平行に形成されており、前記フレキシブル基板２２の開口部２５を完全に塞ぎ、撮像素子２３と対向するようにフレキシブル基板２２の表面３２に固定される。この透光性部材４３は、接着剤４２によってフレキシブル基板２２の表面３２に固定される。   The translucent member 43 has a front surface 44 and a back surface 45 formed in parallel, completely covers the opening 25 of the flexible substrate 22, and faces the image pickup device 23. Fixed to. The translucent member 43 is fixed to the surface 32 of the flexible substrate 22 by an adhesive 42.

そして、撮像素子２３の受光部３１は、フレキシブル基板２２によって遮光され、被写体像の光のみ受光するようにされている。なお、遮光性を高めるため、フレキシブル基板２２の少なくとも開口部２５周辺は遮光性に優れた材質で成形することが好ましい。   The light receiving unit 31 of the image sensor 23 is shielded by the flexible substrate 22 and receives only the light of the subject image. In order to improve the light shielding property, it is preferable to form at least the periphery of the opening 25 of the flexible substrate 22 with a material having an excellent light shielding property.

そして、鏡筒２４は第１の実施形態と異なり、固定部３３の端面３６に一対の突出部３９，３９が設けられず、透光性部材４３の厚さよりも薄い枠状の突出部４６が設けられ、さらに段差部のない鍔部３８が形成される。   Unlike the first embodiment, the lens barrel 24 is not provided with a pair of projecting portions 39, 39 on the end surface 36 of the fixed portion 33, and has a frame-shaped projecting portion 46 thinner than the thickness of the translucent member 43. A collar portion 38 that is provided and has no stepped portion is formed.

その他、鏡筒２４は、固定部３３の端面３６に突起３７，３７が形成され、固定部３３の先端側に雌ネジが形成され、レンズホルダ３５の外面に雄ネジが形成され、両ネジが螺合することにより、固定部３３とレンズホルダ３５とが一体化されるなど第１の実施形態と同じ構成とされている。   In addition, the lens barrel 24 has protrusions 37 and 37 formed on the end surface 36 of the fixing portion 33, a female screw is formed on the distal end side of the fixing portion 33, a male screw is formed on the outer surface of the lens holder 35, and both screws are The fixing portion 33 and the lens holder 35 are integrated by screwing, and the same configuration as that of the first embodiment is adopted.

そして、鏡筒２４の端面３６に設けられた突起３７，３７がフレキシブル基板２２と補強板２７に形成された係合穴２９，２９と係合するように、鏡筒２４の固定部３３が透光性部材４３を覆うと、鏡筒２４の端面３６と透光性部材４３の正面４４の周辺部とが重なり合う。鏡筒２４の端面３６に設けられた枠状の突出部４６が透光性部材４３の厚さよりも低く設けられていることから、この突出部４６がフレキシブル基板２２の表面３２からわずかに離隔して、鏡筒２４の端面３６と透光性部材４３の正面４４の周辺部とは、密着した状態となる。そして、離隔している鏡筒２４の突出部４６とフレキシブル基板２２の表面３２とは接着剤４２によって固定される。さらに、撮像素子２３とフレキシブル基板２２とは接着剤４２によって固定され、バンプ接続による固定を補強している。   The fixing portion 33 of the lens barrel 24 is transparent so that the projections 37 provided on the end surface 36 of the lens barrel 24 engage with the engagement holes 29 29 formed in the flexible substrate 22 and the reinforcing plate 27. When the optical member 43 is covered, the end surface 36 of the lens barrel 24 and the peripheral portion of the front surface 44 of the translucent member 43 overlap each other. Since the frame-like protrusion 46 provided on the end surface 36 of the lens barrel 24 is provided lower than the thickness of the translucent member 43, the protrusion 46 is slightly separated from the surface 32 of the flexible substrate 22. Thus, the end surface 36 of the lens barrel 24 and the peripheral portion of the front surface 44 of the translucent member 43 are in close contact with each other. The protruding portion 46 of the lens barrel 24 and the surface 32 of the flexible substrate 22 that are separated from each other are fixed by an adhesive 42. Furthermore, the image pickup device 23 and the flexible substrate 22 are fixed by an adhesive 42 to reinforce fixing by bump connection.

このように、鏡筒２４の端面３６と透光性部材４３の周辺部とが密着した状態に重なり合うことにより、鏡筒２４の端面３６と撮像素子２３とが平行になる。そして、鏡筒２４の端面３６が鏡筒２４の光軸に対して直角に形成されていることから、この撮像装置は、鏡筒２４の光軸と撮像素子２３の光軸とを容易、かつ、確実に一致させて製造することができる。   As described above, the end face 36 of the lens barrel 24 and the peripheral portion of the translucent member 43 overlap each other so that the end face 36 of the lens barrel 24 and the image pickup device 23 become parallel. Since the end face 36 of the lens barrel 24 is formed at right angles to the optical axis of the lens barrel 24, this imaging device can easily align the optical axis of the lens barrel 24 and the optical axis of the image sensor 23, and It can be manufactured in a consistent manner.

このように第１および第２の実施形態における撮像装置では、フレキシブル基板２２の柔軟性の影響を受けることなく、鏡筒２４の光軸と撮像素子２３の光軸とを一致させることができる。したがって、撮像素子２３は実際の被写体像の光を正確に光電変換することができ、高画質で記録媒体に記録し、表示部に映し出すことができる。   As described above, in the imaging devices according to the first and second embodiments, the optical axis of the lens barrel 24 and the optical axis of the imaging element 23 can be matched without being affected by the flexibility of the flexible substrate 22. Therefore, the image sensor 23 can accurately photoelectrically convert light of an actual subject image, record it on a recording medium with high image quality, and display it on a display unit.

なお、本発明は、前記実施形態１，２に限定することなく、特許請求の範囲に記載した技術的事項の範囲内において種々変更することができる。例えば、フレキシブル基板２２が必要十分な強度を有しているときは、補強板２７をフレキシブル基板２２の裏面２８に張り合わせないようにしてもよい。また、実施形態２で説明したような遮光性に優れたフレキシブル基板２２を実施形態１においても採用することができる。そして、フレキシブル基板２２の裏面２８と表面３２は、便宜的に使用した表現であり、使用状態により、一方の面が表面となり、他方の面が裏面となることもある。   The present invention is not limited to the first and second embodiments, and can be variously modified within the scope of the technical matters described in the claims. For example, when the flexible substrate 22 has a necessary and sufficient strength, the reinforcing plate 27 may not be attached to the back surface 28 of the flexible substrate 22. Further, the flexible substrate 22 having excellent light shielding properties as described in the second embodiment can also be used in the first embodiment. And the back surface 28 and the front surface 32 of the flexible substrate 22 are expressions used for convenience, and depending on the state of use, one surface may be the front surface and the other surface may be the back surface.

本発明に係る撮像装置は、撮像素子の光軸と鏡筒の光軸とを容易、かつ、確実に一致させて製造され、携帯電話機や情報端末機などに備えられるコンパクトな電子カメラに有用である。   The image pickup apparatus according to the present invention is manufactured for the optical axis of the image pickup device and the optical axis of the lens barrel easily and reliably, and is useful for a compact electronic camera provided in a mobile phone, an information terminal, or the like. is there.

本発明に係る撮像素子の第１の実施形態であり、（ａ）は正面断面図、（ｂ）は側面断面図、（ｃ）は底面図BRIEF DESCRIPTION OF THE DRAWINGS It is 1st Embodiment of the image pick-up element based on this invention, (a) is front sectional drawing, (b) is side sectional drawing, (c) is a bottom view. 本発明に係る撮像素子の第２の実施形態であり、（ａ）は正面断面図、（ｂ）は底面図It is 2nd Embodiment of the image pick-up element based on this invention, (a) is front sectional drawing, (b) is a bottom view. 従来の撮像素子の一部断面平面図Partial sectional plan view of a conventional image sensor 図３と異なる従来の撮像素子の正面断面図Front sectional view of a conventional imaging device different from FIG.

符号の説明Explanation of symbols

２２ フレキシブル基板
２３ 撮像素子
２４ 鏡筒
２５ 開口部
２８ 一方の面（裏面）
２９ 係合穴
３０ 隙間
３１ 受光部
３２ 他方の面（表面）
３６ 端面
３７ 突起
３９ 突出部
４０ 光学フィルタ
４２ 接着剤
４３ 透光性部材
４４ 正面
４５ 背面

22 Flexible substrate 23 Image sensor 24 Lens barrel 25 Opening 28 One surface (back surface)
29 Engagement hole 30 Clearance 31 Light receiving part 32 The other surface (front surface)
36 End face 37 Projection 39 Projection 40 Optical filter 42 Adhesive 43 Translucent member 44 Front 45 Back

Claims (3)

開口部を設けたフレキシブル基板と、表面に受光部を有する撮像素子と、入射光を前記撮像素子の受光部に結像するための光学系を内蔵しかつ該光学系における光軸に対して直角な端面を形成した筒状の鏡筒とを少なくとも備え、前記撮像素子の受光部が前記開口部と対向するように撮像素子がフレキシブル基板の一方の面に接続・固定され、前記鏡筒が前記開口部を囲むように鏡筒の端面がフレキシブル基板の他方の面に固定され、前記鏡筒の端面と前記撮像素子の表面とが少なくとも一部分においてフレキシブル基板を挟む状態となっている撮像装置であって、前記撮像素子は、前記開口部の一部分に隙間が設けられるように前記フレキシブル基板の一方の面に固定され、前記鏡筒の端面には、前記隙間から前記フレキシブル基板の一方の面に突出し前記撮像素子の側面に沿う形で位置する突出部が形成され、前記撮像素子が接着剤によって前記突出部に固定されていることを特徴とする請求項１に記載の撮像装置。 A flexible substrate provided with an opening, an image pickup device having a light receiving portion on the surface, and an optical system for imaging incident light on the light receiving portion of the image pickup device are built in and perpendicular to the optical axis in the optical system. such end face at least with the a cylindrical barrel forming a imaging element as the light receiving portion is opposed to the opening of the front SL imaging device is connected and fixed to one surface of the flexible substrate, wherein the barrel the end surface of the lens barrel so as to surround the opening portion is fixed on the other surface of the flexible substrate, and the end surface and the surface of the imaging element of the barrel in the imaging apparatus that has become a state of sandwiching the flexible substrate at least in part The imaging element is fixed to one surface of the flexible substrate so that a gap is provided in a part of the opening, and one end of the flexible substrate is connected to the end surface of the barrel from the gap. Surface protrusions located in line with the side surface of projecting the image sensor is formed on the image pickup apparatus according to claim 1, wherein the imaging device is characterized in that it is fixed to the projecting portion by an adhesive. 前記鏡筒内には透光性部材が設置されてい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 a translucent member is installed in the lens barrel. 前記フレキシブル基板には、係合穴が２か所以上形成され、前記鏡筒の端面には、前記係合穴と係合する突起が設けられていることを特徴とする請求項１または請求項２に記載の撮像装置。 Wherein the flexible substrate, an engaging hole is formed above two, the end face of the barrel, according to claim 1 or claim, characterized in that projections to be engaged with the engagement hole is provided The imaging apparatus according to 2 .
JP2004091481A 2004-03-26 2004-03-26 Imaging device Expired - Fee Related JP4360244B2 (en)

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