JP2011109484A - Multi-lens camera apparatus and electronic information device - Google Patents
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Abstract
Description
本発明は、携帯電話装置などに内蔵するのに好適なレンズ全長が短い撮像レンズを持つ多眼カメラ装置および、この多眼カメラ装置を画像入力デバイスとして撮像部に用いた例えばデジタルビデオカメラおよびデジタルスチルカメラなどのデジタルカメラや、監視カメラなどの画像入力カメラ、スキャナ装置、ファクシミリ装置、テレビジョン電話装置、カメラ付き携帯電話装置などの電子情報機器に関する。 The present invention relates to a multi-lens camera device having an imaging lens with a short overall lens length suitable for being incorporated in a mobile phone device or the like, and a digital video camera and a digital camera, for example, using this multi-eye camera device as an image input device in an imaging unit The present invention relates to an electronic information device such as a digital camera such as a still camera, an image input camera such as a surveillance camera, a scanner device, a facsimile device, a television phone device, and a camera-equipped mobile phone device.
近年、ＣＣＤ（Ｃｈａｒｇｅ Ｃｏｕｐｌｅｄ Ｄｅｖｉｃｅ）およびＣＭＯＳ（Ｃｏｍｐｌｅｍｅｎｔａｒｙ Ｍｅｔａｌ Ｏｘｉｄｅ Ｓｅｍｉｃｏｎｄｕｃｔｏｒ）に代表される固体撮像素子を用いたデジタルスチルカメラの普及が急速に進み、多種多様なデジタルスチルカメラが開発されている。このデジタルスチルカメラの小型化は、固体撮像素子における技術の進歩と共に年々進んでいる。その中でも、携帯型情報端末や携帯電話装置などに搭載されるカメラは、その筐体における大きさの制限などにより、特に、小型化が求められている。 In recent years, digital still cameras using solid-state imaging devices represented by CCD (Charge Coupled Device) and CMOS (Complementary Metal Oxide Semiconductor) have been rapidly spreading, and various digital still cameras have been developed. Miniaturization of this digital still camera is progressing year by year with the advancement of technology in solid-state imaging devices. Among them, a camera mounted on a portable information terminal, a mobile phone device, or the like is particularly required to be miniaturized due to the size limitation of the housing.
カメラとして要求される画角が同一の場合、固体撮像素子の大きさ（撮像領域の対角長）によりレンズの光学長が制約を受ける。このレンズの光学長を短くするためには薄肉レンズや高屈折レンズ材料の採用などの方法が考えられるが、そのようなレンズの光学長を短くする方法には限界がある。
このため、固体撮像素子を分割し、その分割エリア毎にレンズを備えれば、分割した比率に応じてレンズの光学長の短縮化が可能となる。
When the angle of view required for the camera is the same, the optical length of the lens is restricted by the size of the solid-state imaging device (diagonal length of the imaging region). In order to shorten the optical length of this lens, methods such as the use of a thin lens or a high refractive lens material can be considered, but there is a limit to the method of shortening the optical length of such a lens.
For this reason, if the solid-state imaging device is divided and a lens is provided for each divided area, the optical length of the lens can be shortened according to the divided ratio.
特許文献１、２に記載された薄型カメラは、少なくとも３つのサブカメラを備えることにより薄型化を実現している。
The thin cameras described in
図５は、特許文献１、２に開示されている従来の多眼カメラ装置の概略構成例を示す斜視図である。図６は、図１の従来の多眼カメラ装置における撮像素子基板の概略構成例を示す斜視図である。図７は、図１の従来の従来の多眼カメラ装置における要部構成例を示す縦断面図である。
図５〜図７において、従来の多眼カメラ装置としての４眼式カメラ装置１００は、開口絞りアレイ１０２、レンズアレイ１０３、透明ガラス基板などの平面板１０４、遮光マスク１０５および撮像素子基板１０６をこの順次に積層したカメラモジュールである。
レンズアレイ１０２は、サブカメラ毎にサブレンズ１０２ａ、１０２ｂ、１０２ｃおよび１０２ｄのそれぞれを備えている。
撮像素子基板１０６は、遮光マスク１０５により、分割撮像領域１０６ａ、１０６ｂ、１０６ｃおよび１０６ｄに４分割されて互いに隔離されており、それぞれ単色のカラーフィルタを有している。分割撮像領域１０６ａおよび１０６ｂがＧ（緑）、分割撮像領域１０６ｃおよび１０６ｄがそれぞれＲ（赤）、Ｂ（青）となる。サブレンズ毎に集光された入射光は、それぞれが各色のカラーフィルタを、波長毎（色毎）に選択的に透過され、各サブレンズの直下に存在する分割撮像領域上に結像される。これらのサブレンズ１０２ａおよび１０２ｂはＧ（緑）、サブレンズ１０２ｃはＲ（赤）、サブレンズ１０２ｄはＢ（青）の入射光を結像する。さらに、遮光マスク１０５によって、互いに隣接するサブカメラへの迷光は遮断されることになる。
FIG. 5 is a perspective view showing a schematic configuration example of a conventional multi-lens camera device disclosed in
5 to 7, a four-
The
The image
各サブレンズサブレンズ１０２ａ、１０２ｂ、１０２ｃおよび１０２ｄが同じ仕様の場合、サブレンズ１０２ｃにより結像されるＲ（赤）の焦点面の位置は、サブレンズ１０２ａおよび１０２ｂにより結像されるＧ（緑）の焦点面の位置よりも長く、サブレンズ１０２ｄによる結像されるＢ（青）の焦点面の位置は、サブレンズ１０２ａおよび１０２ｂにより結像されるＧ（緑）の焦点面の位置よりも短い。 When each of the sub lenses 102a, 102b, 102c and 102d has the same specification, the position of the focal plane of R (red) formed by the sub lens 102c is G (green) formed by the sub lenses 102a and 102b. The position of the focal plane of B (blue) formed by the sub lens 102d is longer than the position of the focal plane of G (green) formed by the sub lenses 102a and 102b. short.
通常、波長の異なる光線を入射したとき、レンズの焦点面の位置は異なる。特許文献１、２によれば、撮像レンズはアレイ形状を有しており、サブカメラ毎に異なるカラーフィルタを持つ構造が記載されている。
Normally, when light rays having different wavelengths are incident, the position of the focal plane of the lens is different. According to
上記従来の多眼カメラ装置では、レンズアレイ１０３のレンズ領域と、これに対応した撮像素子基板１０６の撮像領域との距離間隔を調整することにより、焦点面の位置にその撮像領域を配置することができるものの、従来の多眼カメラ装置１００の場合、レンズアレイ１０３のレンズはアレイ構造であり、撮像素子基板１０６は分割撮像領域であるため、各サブレンズ毎に分割撮像領域との距離間隔を調整することができない。
特許文献２に開示された上記従来の多眼カメラ装置では、各レンズは、これに対応するカラーフィルタを透過させる光の波長に対して光学特性が最良となるように設計したとの記載があるが、具体的な事例は示されていない。
In the conventional multi-lens camera device, the imaging region is arranged at the position of the focal plane by adjusting the distance between the lens region of the
In the conventional multi-lens camera device disclosed in
通常、アレイ構造のレンズの場合、レンズの成型はレプリカ法と呼ばれる成型を行う。これは、雄型のマスタ金型を一つ製作し、マスタ金型をレンズ配列位置上に転写することで雌型を作成する方法である。この転写方法では、切削、研磨などによる金属加工による金型作成のコストを抑えることができる。しかしながら、レンズはレンズアレイであることから、レンズ特性を個々の各色のカラーフィルタに合わせてレンズ領域と撮像領域との距離間隔を最適化することはできないという問題を有していた。 Usually, in the case of a lens having an array structure, the lens is molded by a so-called replica method. This is a method in which one male master mold is manufactured, and the master mold is transferred onto the lens arrangement position to create a female mold. With this transfer method, it is possible to reduce the cost of mold production by metal processing such as cutting and polishing. However, since the lens is a lens array, there has been a problem that the distance between the lens region and the imaging region cannot be optimized in accordance with the lens characteristics of each color filter.
本発明は、上記従来の問題を解決するもので、レンズ特性を個々の各色のカラーフィルタに合わせてレンズ領域と撮像領域との距離間隔を最適化して解像度を向上することができる多眼カメラ装置、この多眼カメラ装置を画像入力デバイスとして撮像部に用いた例えばカメラ付き携帯電話装置などの電子情報機器を提供することを目的とする。 The present invention solves the above-mentioned conventional problems, and a multi-lens camera apparatus capable of improving the resolution by optimizing the distance between the lens area and the imaging area by matching the lens characteristics with the color filters of the respective colors. An object of the present invention is to provide an electronic information device such as a mobile phone device with a camera using the multi-eye camera device as an image input device in an imaging unit.
なお、同一レンズにおいて入射する光線の色(波長)によって焦点面が変わる。これを色収差という。したがって、通常のベイヤー配列でカラーフィルタを持つセンサでは、色収差のバランスの取れた位置で焦点面調整される。各色毎に見たら必ずしもベスト焦点面では無い。多眼構造にして、カラーフィルタの違うセンサ毎にレンズを作れば、色収差の問題を回避できる。しかしながら、多眼は、レンズアレイの構造を取るため、レンズ毎に焦点を合わせられない。それを如何に回避するのかというところが、本発明の趣旨である。 Note that the focal plane changes depending on the color (wavelength) of light rays incident on the same lens. This is called chromatic aberration. Therefore, in a sensor having a color filter in a normal Bayer array, the focal plane is adjusted at a position where chromatic aberration is balanced. If it sees for every color, it is not necessarily the best focal plane. The chromatic aberration problem can be avoided by using a multi-lens structure and making a lens for each sensor with a different color filter. However, since the multiview lens has a lens array structure, it cannot focus on each lens. The purpose of the present invention is how to avoid it.
本発明の多眼カメラ装置は、複数の撮像領域と、該撮像領域毎に配設された各色のカラーフィルタと、該撮像領域毎に対応して各サブレンズが設けられたレンズアレイとが積層された多眼カメラ装置において、該レンズアレイの少なくとも２つのサブレンズの該撮像領域に対する焦点距離が互いに異なっているものであり、そのことにより上記目的が達成される。 The multi-lens camera device of the present invention includes a plurality of imaging regions, a color filter of each color arranged for each imaging region, and a lens array provided with each sub lens corresponding to each imaging region. In the multi-lens camera device, the focal lengths of the at least two sub-lenses of the lens array with respect to the imaging region are different from each other, thereby achieving the above object.
また、本発明の多眼カメラ装置は、複数の撮像領域と、該撮像領域毎に配設された各色のカラーフィルタと、該撮像領域毎に対応して各サブレンズが設けられたレンズアレイとが積層された多眼カメラ装置において、該レンズアレイのサブレンズはそれぞれ、該サブレンズに組み合わされる各色のカラーフィルタによって選択的に透過される波長光線の焦点面の位置が該撮像領域上で同一となるように構成されているであり、そのことにより上記目的が達成される。 The multi-lens camera device of the present invention includes a plurality of imaging regions, a color filter of each color arranged for each imaging region, and a lens array provided with each sub lens corresponding to each imaging region. In the multi-lens camera device in which the sub-lenses of the lens array are stacked, the focal plane positions of the wavelength rays selectively transmitted by the color filters of the respective colors combined with the sub-lenses are the same on the imaging region. Thus, the above object is achieved.
さらに、好ましくは、本発明の多眼カメラ装置におけるレンズアレイのサブレンズはそれぞれ、該サブレンズに組み合わされる各色のカラーフィルタによって選択的に透過される波長光線の焦点面の位置が前記撮像領域上で同一となるように構成されている。 Further preferably, in each of the sub-lenses of the lens array in the multi-lens camera device of the present invention, the position of the focal plane of the wavelength ray selectively transmitted by the color filter of each color combined with the sub-lens is on the imaging region. It is comprised so that it may become the same.
さらに、好ましくは、本発明の多眼カメラ装置におけるレンズアレイのサブレンズはそれぞれ、該サブレンズに対応したカラーフィルタの波長特性に合わせた焦点距離を有している。 Further preferably, each of the sub-lenses of the lens array in the multi-lens camera device of the present invention has a focal length that matches the wavelength characteristics of the color filter corresponding to the sub-lens.
さらに、好ましくは、本発明の多眼カメラ装置におけるサブレンズの被写体側レンズ面から前記撮像領域までの距離を、前記カラーフィルタの透過波長毎の焦点距離に合わせている。 Furthermore, it is preferable that the distance from the subject-side lens surface of the sub lens in the multi-lens camera device of the present invention to the imaging region is matched with the focal length for each transmission wavelength of the color filter.
さらに、好ましくは、本発明の多眼カメラ装置において、前記焦点距離または前記焦点面の位置は、前記レンズアレイのサブレンズ毎の厚みによって設定されている。 Further preferably, in the multi-lens camera device of the present invention, the focal length or the position of the focal plane is set by the thickness of each sub-lens of the lens array.
さらに、好ましくは、本発明の多眼カメラ装置におけるサブレンズの厚みを調整するのは、該サブレンズの被写体側のレンズ面および、該サブレンズの撮像領域側のレンズ面のうちの少なくともいずれかである。 Further preferably, the thickness of the sub lens in the multi-lens camera device of the present invention is adjusted by at least one of a lens surface on the subject side of the sub lens and a lens surface on the imaging region side of the sub lens. It is.
さらに、好ましくは、本発明の多眼カメラ装置におけるサブレンズの積層枚数が２枚の場合、前記焦点距離または前記焦点面の位置を調整するレンズは、第１レンズおよび第２レンズの少なくともいずれかである。 Still preferably, in a multi-lens camera device according to the present invention, when the number of stacked sub lenses is two, the lens for adjusting the focal length or the position of the focal plane is at least one of the first lens and the second lens. It is.
さらに、好ましくは、本発明の多眼カメラ装置におけるサブレンズの積層枚数が３枚の場合、前記焦点距離または前記焦点面の位置を調整するレンズは、第１レンズ、第２レンズおよび第３レンズのうちの少なくともいずれかである。 Still preferably, in a multi-lens camera device according to the present invention, when the number of laminated sub lenses is three, the lens for adjusting the focal length or the position of the focal plane is the first lens, the second lens, and the third lens. At least one of them.
さらに、好ましくは、本発明の多眼カメラ装置における焦点距離または前記焦点面の位置は、前記レンズアレイと前記撮像領域との間に透明平行板を備える場合に、該透明平行板の厚さにより調整されている。 Further preferably, the focal length or the position of the focal plane in the multi-lens camera device of the present invention depends on the thickness of the transparent parallel plate when a transparent parallel plate is provided between the lens array and the imaging region. It has been adjusted.
さらに、好ましくは、本発明の多眼カメラ装置におけるカラーフィルタはそれぞれ、Ｒ（赤）、Ｇ（緑）およびＢ（青）の各色をそれぞれ有している。 Further preferably, the color filters in the multi-lens camera device of the present invention respectively have R (red), G (green), and B (blue) colors.
さらに、好ましくは、本発明の多眼カメラ装置におけるカラーフィルタはそれぞれ、Ｃ（水色）、Ｍ（赤紫）、Ｙ（黄色）およびＧ（緑）の各色をそれぞれ有している。 Further preferably, the color filters in the multi-lens camera device of the present invention respectively have C (light blue), M (red purple), Y (yellow) and G (green) colors.
さらに、好ましくは、本発明の多眼カメラ装置における複数の撮像領域は、被写体からの入射光を光電変換して撮像する複数の受光部が設けられた撮像領域から均等に分割されている。 Further, preferably, the plurality of imaging regions in the multi-lens camera device of the present invention are equally divided from the imaging region provided with a plurality of light receiving units that photoelectrically convert incident light from a subject to perform imaging.
さらに、好ましくは、本発明の多眼カメラ装置において、基板上に、被写体からの入射光を光電変換して撮像する複数の受光部が設けられた撮像領域が複数設けられている。 Furthermore, preferably, in the multi-lens camera device of the present invention, a plurality of imaging regions provided with a plurality of light receiving units that photoelectrically convert incident light from a subject and image them are provided on a substrate.
さらに、好ましくは、本発明の多眼カメラ装置における撮像領域は４つあり、これと同数の前記サブレンズおよび前記カラーフィルタを有している。 Further, preferably, the multi-view camera device of the present invention has four imaging regions, and the same number of the sub lenses and the color filters are provided.
本発明の電子情報機器は、本発明の上記多眼カメラ装置を画像入力デバイスとして撮像部に用いたものであり、そのことにより上記目的が達成される。 An electronic information device according to the present invention uses the multi-lens camera device according to the present invention as an image input device in an imaging unit, thereby achieving the above object.
上記構成により、以下、本発明の作用を説明する。 With the above configuration, the operation of the present invention will be described below.
カメラとして要求される画角が同一の場合、撮像領域の対角長によりレンズの光学長が制約を受ける。このため、レンズの光学長（焦点距離）を短くするために、撮像領域を分割し、その分割エリア毎にレンズを備えれば、分割した比率に応じてレンズの光学長（焦点距離）の短縮化が可能となってカメラの薄型化が可能となる。 When the angle of view required for the camera is the same, the optical length of the lens is restricted by the diagonal length of the imaging region. For this reason, in order to shorten the optical length (focal length) of the lens, if the imaging area is divided and a lens is provided for each divided area, the optical length (focal length) of the lens is shortened according to the divided ratio. The camera can be made thinner.
本発明においては、レンズアレイのサブレンズはそれぞれ、組み合わされる各色のカラーフィルタによって選択的に透過される波長光線の焦点面の位置が固体撮像素子の各撮像領域上で同一となるように構成されている。 In the present invention, each of the sub-lenses of the lens array is configured such that the position of the focal plane of the wavelength ray selectively transmitted by the color filters of the respective colors combined is the same on each imaging region of the solid-state imaging device. ing.
これによって、レンズ特性を個々の各色のカラーフィルタに合わせてレンズ領域と撮像領域との距離間隔（焦点距離）を最適化することが可能となる。これによって、カラーフィルタの色毎に、その色に応じた焦点距離の正確なレンズを作ることができて、色収差をなくして高解像度とすることが可能となる。したがって、高解像度と薄型化が両立した多眼カメラ装置を実現可能となる。 This makes it possible to optimize the distance between the lens area and the imaging area (focal length) by matching the lens characteristics with the color filters of each color. As a result, an accurate lens having a focal length corresponding to each color of the color filter can be made, and chromatic aberration can be eliminated to achieve a high resolution. Therefore, it is possible to realize a multi-lens camera device that achieves both high resolution and thinning.
以上により、本発明によれば、固体撮像素子が複数の撮像領域を有しており、各撮像領域のそれぞれに対応するように複数のサブレンズを備えると、全撮像領域に対応した一つのレンズに比べて複数のサブレンズの方がその焦点距離が短縮化されてカメラの薄型化を実現することができる。また、レンズ特性を個々の各色のカラーフィルタに合わせてレンズ領域と撮像領域との距離間隔（焦点距離）を最適化するため、色収差をなくして高解像度とすることができる。これによって、高解像度と薄型化の両立をした多眼カメラ装置を低コストで実現できる。 As described above, according to the present invention, when the solid-state imaging device has a plurality of imaging regions and includes a plurality of sub-lenses corresponding to the respective imaging regions, one lens corresponding to the entire imaging region is provided. Compared to the above, the plurality of sub-lenses have a shorter focal length, and the camera can be made thinner. In addition, since the distance between the lens region and the imaging region (focal length) is optimized by matching the lens characteristics with each color filter, it is possible to eliminate chromatic aberration and achieve high resolution. As a result, a multi-lens camera device that achieves both high resolution and thinning can be realized at low cost.
以下に、本発明の多眼カメラ装置の実施形態１として、４眼式カメラ装置の場合を説明し、この４眼式カメラ装置を画像入力デバイスとして撮像部に用いた例えばカメラ付き携帯電話装置などの電子情報機器の実施形態２について、図面を参照しながら詳細に説明する。
Hereinafter, as a first embodiment of the multi-lens camera apparatus of the present invention, a case of a four-lens camera apparatus will be described, and for example, a camera-equipped mobile phone apparatus using the four-lens camera apparatus as an image input device in an
（実施形態１）
図１は、本発明の実施形態１における多眼カメラ装置の要部構成例を示す縦断面図である。図２は、図１の多眼カメラ装置の概略構成例を示す斜視図である。図３は、図１の撮像素子基板の概略構成例を示す斜視図である。
(Embodiment 1)
FIG. 1 is a longitudinal cross-sectional view showing an exemplary configuration of a main part of a multi-lens camera device according to
図１〜図３において、多眼カメラ装置としての４眼式カメラ装置１は、カメラモジュールであり、入射光絞り用の開口部が等間隔に４つ形成された開口絞りアレイ２と、４つの開口部にそれぞれ対応してレンズ領域が形成されたレンズアレイ３と、透明ガラス基板で構成される平面板４と、４つの開口部および４つのレンズ領域にそれぞれ対応して配置された各撮像領域の周囲に配設された遮光マスク５と、４つの撮像領域に分割して配設された撮像素子基板６とを有している。
1 to 3, a four-
レンズアレイ３は、被写体からの入射光を光電変換して撮像する４つのサブカメラ毎にレンズ領域としてのサブレンズ３ａ、３ｂ、３ｃおよび３ｄが互いに等間隔に、平面視で仮想正方形の４角位置にそれぞれ配置されている。
The
撮像素子基板６は、４つの撮像領域６ａ、６ｂ、６ｃおよび６ｄに均等に分割されている。分割撮像領域６ａ、６ｂ、６ｃおよび６ｄのそれぞれ毎にレンズを備えれば、分割した比率に応じてレンズの光学長（焦点距離）の短縮化が可能となってカメラ装置の薄型化が可能となる。これによって、高解像度と薄型化が両立した４眼式カメラ装置１を実現することができる。
The image
撮像素子基板６の各撮像領域６ａ、６ｂ、６ｃおよび６ｄの上方にそれぞれ単色のカラーフィルタ（図示せず）を有している。例えば撮像領域６ａおよび６ｂはＧ（緑）、撮像領域６ｃおよび６ｄはこの順にＲ（赤）、Ｂ（青）の単色のカラーフィルタが配置されている。サブレンズ３ａ、３ｂ、３ｃおよび３ｄのそれぞれ毎に集光された入射光は、それぞれが各色のカラーフィルタによって、各色の特定波長毎に選択的に透過され、各サブレンズ３ａ、３ｂ、３ｃおよび３ｄのそれぞれの直下に存在する撮像素子基板６の分割撮像領域６ａ、６ｂ、６ｃおよび６ｄ上にそれぞれ結像されるようになっている。即ち、サブレンズ３ａおよび３ｂはＧ（緑）の入射光を分割撮像領域６ａ、６ｂに集光して結像し、サブレンズ３ｃはＲ（赤）、サブレンズ３ｄはＢ（青）の各入射光を分割撮像領域６ｃ、６ｄに集光して結像する。
Monochromatic color filters (not shown) are provided above the
撮像素子基板６の各撮像領域６ａ、６ｂ、６ｃおよび６ｄの周囲にそれぞれ配置された遮光マスク５により、４つの撮像領域６ａ、６ｂ、６ｃおよび６ｄが光学的に隔離されて、遮光マスク５によって隣接する各色のサブカメラへの迷光が遮断されて画質を向上させることができる。
The four
ここで、本発明の特徴構成について詳細に説明する。 Here, the characteristic configuration of the present invention will be described in detail.
レンズアレイ３のサブレンズ３ａ、３ｂ、３ｃおよび３ｄはそれぞれ、これに組み合わされる各色のカラーフィルタによって選択的に透過される波長光線の焦点面の位置が撮像素子基板６の各撮像領域６ａ、６ｂ、６ｃおよび６ｄ上でそれぞれ同一となるように構成されている。より具体的には、各サブレンズ３ａおよび３ｂの第１レンズ面に対して、サブレンズ３ｃの第１レンズ面は高く（より被写体寄り）、サブレンズ３ｄの第１レンズ面は低く（より撮像領域寄り）なっている。
The sub-lenses 3a, 3b, 3c, and 3d of the
この場合、レンズアレイ３のサブレンズ３ａ、３ｂ、３ｃおよび３ｄはそれぞれ、各サブレンズに対応した各色のカラーフィルタの波長特性に合わせたレンズ焦点距離を有している。例えばサブレンズ３ａ、３ｂ、３ｃおよび３ｄの被写体側レンズ面（上側レンズ面）から、対応する撮像素子基板６の撮像領域６ａ、６ｂ、６ｃおよび６ｄのそれぞれまでの距離を、入射光が通過するカラーフィルタの波長毎のレンズ焦点距離に合わせて最適化している。このレンズ焦点距離は、レンズアレイ３のサブレンズ３ａ、３ｂ、３ｃおよび３ｄのそれぞれ毎の厚みによって最適化かされている。図１の場合は、サブレンズ３ａの厚みと、サブレンズ３ｃの厚みとの差が厚みｔだけ高くなっている。
In this case, each of the
各サブレンズ３ａ、３ｂ、３ｃおよび３ｄのレンズ面（レンズ領域）の形状を同じくしてレンズ厚みで焦点面を位置調整する効果は、レンズアレイ３を製作する工法上も有利である。レンズアレイ３のレンズ面は、一つのマスタ型（雄型）を所定ピッチで順送りで転写し、アレイ金型（雌型）を製作し、成型を行う。なお、例えばマスタ型（雄型）をアレイで製作することは通常困難である。各サブレンズの面形状が異なる場合はこの工法でアレイ金型を製作することができない。
The effect of adjusting the focal plane with the lens thickness by making the lens surfaces (lens regions) of the sub-lenses 3a, 3b, 3c, and 3d the same is advantageous in terms of the manufacturing method of the
このとき、各サブレンズ３ａ、３ｂ、３ｃおよび３ｄのレンズ面形状と同じ形状のマスタ型（雄型）を用いて、各サブレンズ３ａ、３ｂ、３ｃおよび３ｄのレンズ厚さの違いをどのようにして作製するのかについては、マスタ型（雄型）を用いて透明レンズ樹脂材料にレンズ面形状を作るときのストローク寸法を制御すればよい。
At this time, by using a master type (male type) having the same shape as the lens surface shape of each of the
以上により、本実施形態１によれば、固体撮像素子としての撮像素子基板６が４つの撮像領域６ａ、６ｂ、６ｃおよび６ｄを有しており、各撮像領域６ａ、６ｂ、６ｃおよび６ｄのそれぞれに対応するように各サブレンズ３ａ、３ｂ、３ｃおよび３ｄを備えると、全撮像領域に対応した一つの大きなレンズに比べて複数のサブレンズの方がその焦点距離が短縮化されてカメラの薄型化を実現することができる。また、レンズアレイ３のサブレンズ３ａ、３ｂ、３ｃおよび３ｄはそれぞれ、これに組み合わされる各色のカラーフィルタによって選択的に透過される波長光線の焦点面の位置が撮像素子基板６の各撮像領域６ａ、６ｂ、６ｃおよび６ｄ上で同一となるように構成されている。これによって、レンズ特性を個々の各色のカラーフィルタに合わせてサブレンズ３ａ、３ｂ、３ｃおよび３ｄと、これに対応する撮像領域６ａ、６ｂ、６ｃおよび６ｄとの距離間隔（焦点距離）を最適化することができて、カラーフィルタの色毎に、その色に応じた焦点距離の正確なレンズを作ることができて、色収差をなくして高解像度とすることができる。したがって、高解像度と薄型化が両立した４眼式カメラ装置１を実現することができる。
As described above, according to the first embodiment, the
本実施形態１の効果は、薄型化に限るわけでなく、撮像素子基板６への光線入射角度を小さくする（テレセントリック性）必要があるときにも有効である。
The effect of the first embodiment is not limited to thinning, but is also effective when the light incident angle on the
なお、本発明の具体的な実施形態１を示したが、本発明は、先に示した上記実施形態１の具体的形状および数値などに限定されるものではなく、所望の光学特性を得るために、各パラメータを適宜変更することができることは言うまでもないことである。
In addition, although
なお、本実施形態１では、レンズアレイ３のサブレンズ３ａ、３ｂ、３ｃおよび３ｄの厚みを調整するのは、サブレンズ３ａ、３ｂ、３ｃおよび３ｄの被写体側のレンズ面（上側のレンズ面）で行ったが、これに限らず、サブレンズ３ａ、３ｂ、３ｃおよび３ｄの撮像領域側のレンズ面（下側のレンズ面）で、サブレンズ３ａ、３ｂ、３ｃおよび３ｄの厚みを調整してもよい。要するに、サブレンズ３ａ、３ｂ、３ｃおよび３ｄの厚みを調整するのは、サブレンズの被写体側のレンズ面であっても、撮像素子基板６側のレンズ面であってもよい。
In the first embodiment, the thickness of the
また、本実施形態１では、特に説明しなかったが、サブレンズ３ａ、３ｂ、３ｃおよび３ｄの積層枚数が２枚の場合にも、焦点面の位置を調整するサブレンズ３ａ、３ｂ、３ｃおよび３ｄは、第１レンズおよび第２レンズのうちの少なくともいずれかであればよい。また、本実施形態１では、特に説明しなかったが、サブレンズ３ａ、３ｂ、３ｃおよび３ｄの積層枚数が３枚の場合にも、焦点面の位置を調整するサブレンズ３ａ、３ｂ、３ｃおよび３ｄは、第１レンズ、第２レンズおよび第３レンズのうちの少なくともいずれかであればよい。
Although not particularly described in the first embodiment, the sub-lenses 3a, 3b, 3c for adjusting the position of the focal plane and the sub-lenses 3a, 3b, 3c, and 3d are adjusted even when the number of the sub-lenses 3a, 3b, 3c, and 3d is two. 3d may be at least one of the first lens and the second lens. Although not particularly described in the first embodiment, the
さらに、本実施形態１では、特に説明しなかったが、サブレンズ３ａ、３ｂ、３ｃおよび３ｄのそれぞれから、撮像素子基板６の撮像領域６ａ、６ｂ、６ｃおよび６ｄのそれぞれまでのレンズ焦点距離は、レンズアレイ３と撮像素子基板６との間に設けられた透明ガラス基板などの平行板４の厚さにより全体的に調整することも可能とである。即ち、レンズアレイ３と撮像素子基板６の間に撮像素子保護ガラスなどの平行板４を備える場合、上記焦点面の位置を調整するものが平行板４であってもよい。
Furthermore, although not specifically described in the first embodiment, the lens focal lengths from the
さらに、本実施形態１では、特に説明しなかったが、撮像素子基板６に設けたカラーフィルタの各色は、Ｒ（赤）、Ｇ（緑）およびＢ（青）の各色に限るものではなく、例えばＣ（水色）、Ｍ（赤紫）Ｙ、（黄色）およびＧ（緑）の各色としてもよい。
Furthermore, although not specifically described in the first embodiment, the colors of the color filters provided on the
さらに、本実施形態１では、複数の撮像領域を持つ撮像素子基板６として、一つの撮像素子基板６の撮像領域を複数（ここでは４つ）に分割した場合について説明したが、これに限らず、例えば一枚の基板上に複数の撮像素子（複数の撮像領域）を実装しており、各サブレンズに対して個々の撮像素子（個々の撮像領域）との間隔（焦点距離）が調整されるようにすることができる。この場合も本発明は有効である。即ち、撮像素子基板６の複数の撮像領域（ここでは４つの撮像領域）として、基板上に、被写体からの入射光を光電変換して撮像する複数の受光部が設けられた撮像領域が複数設けられていてもよい。
Furthermore, in the first embodiment, as the
なお、上記実施形態１では、４眼式カメラ装置１を用いて説明したが、４眼式カメラ装置１に限るものではなく、２眼式でも３眼式でもよく、５眼式以上のカメラ装置であってもよい。
In the first embodiment, the description has been made using the four-
（実施形態２）
図４は、本発明の実施形態２として、本発明の実施形態１の４眼式カメラ装置１を撮像部に用いた電子情報機器の概略構成例を示すブロック図である。
(Embodiment 2)
FIG. 4 is a block diagram illustrating a schematic configuration example of an electronic information device using the four-
図４において、本実施形態２の電子情報機器９０は、上記実施形態１の４眼式カメラ装置１からの撮像信号を所定の信号処理をしてカラー画像信号を得る固体撮像装置９１と、この固体撮像装置９１からのカラー画像信号を記録用に所定の信号処理した後にデータ記録可能とする記録メディアなどのメモリ部９２と、この固体撮像装置９１からのカラー画像信号を表示用に所定の信号処理した後に液晶表示画面などの表示画面上に表示可能とする液晶表示装置などの表示手段９３と、この固体撮像装置９１からのカラー画像信号を通信用に所定の信号処理をした後に通信処理可能とする送受信装置などの通信手段９４と、この固体撮像装置９１からのカラー画像信号を印刷用に所定の印刷信号処理をした後に印刷処理可能とするプリンタなどの画像出力手段９５とを有している。なお、この電子情報機器９０として、これに限らず、固体撮像装置９１の他に、メモリ部９２と、表示手段９３と、通信手段９４と、プリンタなどの画像出力手段９５とのうちの少なくともいずれかを有していてもよい。
In FIG. 4, an
この電子情報機器９０としては、前述したように例えばデジタルビデオカメラ、デジタルスチルカメラなどのデジタルカメラや、監視カメラ、ドアホンカメラ、車載用後方監視カメラなどの車載用カメラおよびテレビジョン電話用カメラなどの画像入力カメラ、スキャナ装置、ファクシミリ装置、カメラ付きパーソナルコンピュータ、カメラ付き携帯電話装置および携帯端末装置（ＰＤＡ）などの画像入力デバイスを有した電子機器が考えられる。
As described above, the
したがって、本実施形態２によれば、この固体撮像装置９１からのカラー画像信号に基づいて、これを表示画面上に良好に表示したり、これを紙面にて画像出力手段９５により良好にプリントアウト（印刷）したり、これを通信データとして有線または無線にて良好に通信したり、これをメモリ部９２に所定のデータ圧縮処理を行って良好に記憶したり、各種データ処理を良好に行うことができる。
Therefore, according to the second embodiment, on the basis of the color image signal from the solid-
なお、本実施形態１では、４つの撮像領域６ａ、６ｂ、６ｃおよび６ｄを持つ撮像素子基板６と、撮像領域６ａ、６ｂ、６ｃおよび６ｄのそれぞれに配設された所定色配列のカラーフィルタ（図示せず）と、撮像領域６ａ、６ｂ、６ｃおよび６ｄのそれぞれに対応して各サブレンズ３ａ、３ｂ、３ｃおよび３ｄが設けられたレンズアレイ３とを備えた４眼式カメラ装置１において、レンズアレイ３のサブレンズ３ａ、３ｂ、３ｃおよび３ｄはそれぞれ、各サブレンズ３ａ、３ｂ、３ｃおよび３ｄのそれぞれに組み合わされる各色のカラーフィルタ（図示せず）によって選択的に透過される波長光線の焦点面の位置が撮像素子基板６の各撮像領域６ａ、６ｂ、６ｃおよび６ｄ上で同一となるように構成されている場合について説明したが、これに限らず、レンズアレイ３の少なくとも２つのサブレンズの撮像領域に対する焦点距離が互いに異なっている場合にも、カラーフィルタの色に応じた焦点距離の正確なサブレンズを作ることができて、色収差をなくして高解像度とすることができる。したがって、レンズ特性を個々の各色のカラーフィルタに合わせてレンズ領域と撮像領域との距離間隔を最適化して解像度を向上する本発明の目的を達成することができる。
In the first embodiment, the image
以上のように、本発明の好ましい実施形態１、２を用いて本発明を例示してきたが、本発明は、この実施形態１、２に限定して解釈されるべきものではない。本発明は、特許請求の範囲によってのみその範囲が解釈されるべきであることが理解される。当業者は、本発明の具体的な好ましい実施形態１、２の記載から、本発明の記載および技術常識に基づいて等価な範囲を実施することができることが理解される。本明細書において引用した特許、特許出願および文献は、その内容自体が具体的に本明細書に記載されているのと同様にその内容が本明細書に対する参考として援用されるべきであることが理解される。
As mentioned above, although this invention was illustrated using
本発明は、携帯電話装置などに内蔵するのに好適なレンズ全長が短い撮像レンズを持つ多眼カメラ装置および、この多眼カメラ装置を画像入力デバイスとして撮像部に用いた例えばデジタルビデオカメラおよびデジタルスチルカメラなどのデジタルカメラや、監視カメラなどの画像入力カメラ、スキャナ装置、ファクシミリ装置、テレビジョン電話装置、カメラ付き携帯電話装置などの電子情報機器の分野において、固体撮像素子が複数の撮像領域を有しており、各撮像領域のそれぞれに対応するように複数のサブレンズを備えると、全撮像領域に対応した一つのレンズに比べて複数のサブレンズの方がその焦点距離が短縮化されてカメラの薄型化を実現することができる。また、レンズ特性を個々の各色のカラーフィルタに合わせてレンズ領域と撮像領域との距離間隔（焦点距離）を最適化するため、色収差をなくして高解像度とすることができる。これによって、高解像度と薄型化の両立をした多眼カメラ装置を低コストで実現できる。このようにして、本発明に係る多眼カメラ装置は、デジタルスチルカメラなどの撮像機器に好適に用いることができる。また、携帯用途に適した小型の撮像機器に対して特に好適に用いることができる。具体的には、携帯型情報端末や携帯電話装置などに搭載されるデジタルカメラなどを挙げることができる。 The present invention relates to a multi-lens camera device having an imaging lens with a short overall lens length suitable for being incorporated in a mobile phone device or the like, and a digital video camera and a digital camera, for example, using this multi-eye camera device as an image input device in an imaging unit In the field of electronic information equipment such as digital cameras such as still cameras, image input cameras such as surveillance cameras, scanner devices, facsimile devices, television telephone devices, and mobile phone devices with cameras, solid-state image sensors have multiple imaging areas. If a plurality of sub lenses are provided to correspond to each imaging region, the focal length of the plurality of sub lenses is shortened compared to one lens corresponding to the entire imaging region. The camera can be thinned. In addition, since the distance between the lens region and the imaging region (focal length) is optimized by matching the lens characteristics with each color filter, it is possible to eliminate chromatic aberration and achieve high resolution. As a result, a multi-lens camera device that achieves both high resolution and thinning can be realized at low cost. Thus, the multi-lens camera device according to the present invention can be suitably used for an imaging device such as a digital still camera. Further, it can be particularly preferably used for a small imaging device suitable for portable use. Specifically, a digital camera mounted on a portable information terminal, a mobile phone device, or the like can be given.
１ ４眼式カメラ装置（多眼カメラ装置）
２ 開口絞りアレイ
３ レンズアレイ
３ａ、３ｂ、３ｃ、３ｄ サブレンズ
４ 平面板
５ 遮光マスク
６ 撮像素子基板（固体撮像素子）
６ａ、６ｂ、６ｃ、６ｄ 分割撮像領域
７ａ サブレンズ６ａにより結像される光線
７ｃ サブレンズ６ｃにより結像される光線
９０ 電子情報機器
９１ 固体撮像装置
９２ メモリ部
９３ 表示手段
９４ 通信手段
９５ 画像出力手段
1 4-eye camera device (multi-eye camera device)
2
6a, 6b, 6c, 6d Divided
Claims (16)
該レンズアレイの少なくとも２つのサブレンズの該撮像領域に対する焦点距離が互いに異なっている多眼カメラ装置。 In a multi-lens camera device in which a plurality of imaging regions, a color filter of each color arranged for each imaging region, and a lens array provided with each sub lens corresponding to each imaging region are stacked,
A multi-lens camera device in which focal lengths of the at least two sub-lenses of the lens array with respect to the imaging region are different from each other.
該レンズアレイのサブレンズはそれぞれ、該サブレンズに組み合わされる各色のカラーフィルタによって選択的に透過される波長光線の焦点面の位置が該撮像領域上で同一となるように構成されている多眼カメラ装置。 In a multi-lens camera device in which a plurality of imaging regions, a color filter of each color arranged for each imaging region, and a lens array provided with each sub lens corresponding to each imaging region are stacked,
Each of the sub-lenses of the lens array is configured so that the focal plane positions of the wavelength rays selectively transmitted by the color filters of the respective colors combined with the sub-lens are the same on the imaging region. Camera device.
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