JPH01235920A - Image forming optical system for solid-state image pickup element - Google Patents
Image forming optical system for solid-state image pickup elementInfo
- Publication number
- JPH01235920A JPH01235920A JP63061846A JP6184688A JPH01235920A JP H01235920 A JPH01235920 A JP H01235920A JP 63061846 A JP63061846 A JP 63061846A JP 6184688 A JP6184688 A JP 6184688A JP H01235920 A JPH01235920 A JP H01235920A
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- JP
- Japan
- Prior art keywords
- lens
- pass filter
- optical system
- low
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 45
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 238000003384 imaging method Methods 0.000 claims description 37
- 239000000463 material Substances 0.000 abstract description 2
- 239000011347 resin Substances 0.000 abstract description 2
- 229920005989 resin Polymers 0.000 abstract description 2
- 239000012780 transparent material Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 239000003086 colorant Substances 0.000 description 3
- 235000010724 Wisteria floribunda Nutrition 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
Landscapes
- Lenses (AREA)
- Color Television Image Signal Generators (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明はカメラ、とくに色分離フィルタを用いた固体撮
像素子のための結像光学系に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an imaging optical system for a camera, particularly a solid-state image sensor using a color separation filter.
背景技術
周知のようにカラー固体撮像素子には、色分離された映
像信号を出力するために、撮像セルアレイの表面に色分
離フィルタが配設されたものがある。色分離フィルタの
セグメント配列の空間周波数より高い周波数を有する絵
柄を表わす入射光によって再生画像に偽色が発生するの
を防ぐために、そのような高域画像の入射光を除去する
光学的低域通過フィルタを撮像素子の前方に配設する。BACKGROUND ART As is well known, some color solid-state imaging devices include color separation filters disposed on the surface of an imaging cell array in order to output color-separated video signals. In order to prevent false colors in the reproduced image caused by incident light representing a picture having a frequency higher than the spatial frequency of the segment array of the color separation filter, an optical low-pass filter removes such high-pass image incident light. A filter is placed in front of the image sensor.
・
たとえばビデオカメラなどの従来の結像光学系では、こ
の低域フィルタが撮像素子の直前に配量されている。こ
のため光学系レンズは、そのフランジパックを長くとり
、そこに低域フィルタを配設するように設計されていた
。したがってレンズ系は、たとえばレトロタイプのよう
に口径の大きな、しかもレンズ長の長いものを使用しな
ければならず、大型化していた。- In conventional imaging optical systems, such as video cameras, for example, this low-pass filter is placed just in front of the image sensor. For this reason, optical lenses were designed to have a long flange pack and a low-pass filter disposed there. Therefore, the lens system had to have a large aperture and a long lens length, such as a retro type, which resulted in an increase in size.
則□負
本発明はこのような従来技術の欠点を解消し、小型化さ
れた固体撮像素子用結像光学系を提供することを目的と
する。Rule □Negative An object of the present invention is to eliminate such drawbacks of the prior art and provide a compact imaging optical system for a solid-state imaging device.
発明の開示
本発明によれば、光学的低域通過フィルタをレンズ系の
前またはその代返に配設することにより、結像光学系に
バックフォーカスの短いレンズの使用を可能にしている
。そのため、従来と同じ明るさを得るためにはレンズ径
の小さいレンズを使用することができる。DISCLOSURE OF THE INVENTION According to the present invention, an optical low-pass filter is disposed before or in place of the lens system, thereby making it possible to use a lens with a short back focus in the imaging optical system. Therefore, in order to obtain the same brightness as before, a lens with a smaller lens diameter can be used.
本発明によれば、色分離フィルタが撮像セルアレイの上
に配設された゛カラー固体撮像素子の撮像セルアレイに
被写界の像を結像する固体撮像素子用結像光学系は、撮
像セルアレイの光軸上に配設され撮像セルアレイに像を
結像するレンズと、レンズに対してカラー固体撮像素子
とは反対の光軸上に配設され、被写界から入射する光の
うち色分離フィルタの色フィルタセグメント配列の空間
周波数より高い空間周波数を有する像の成分を除去する
光学フィルタとを有する。According to the present invention, an imaging optical system for a solid-state imaging device that forms an image of a field on an imaging cell array of a color solid-state imaging device, in which a color separation filter is disposed on an imaging cell array, A lens is arranged on the axis and forms an image on the imaging cell array, and a lens is arranged on the optical axis opposite to the color solid-state image sensor with respect to the lens. and an optical filter that removes components of the image having a spatial frequency higher than the spatial frequency of the color filter segment array.
実施例の説明
次に添付図面を参照して本発明による同体撮像素子用結
像光学系の実施例を詳細に説明する。DESCRIPTION OF EMBODIMENTS Next, embodiments of an imaging optical system for a solid-body imaging device according to the present invention will be described in detail with reference to the accompanying drawings.
第１図を参照すると、カラー固体撮像素子１０を有する
カメラの結像光学系に本発明を適用した実施例が示され
ている。カラー固体撮像素子１０は、たとえばＣＯＤな
どの電荷転送テバイスであり、その撮像セルアレイ１２
の表面には色分離フィルタ１４が配設されている。色分
離フィルタ１４は、撮像セルアレイ１２の各撮像セルに
向う光を３分解色に分離するように配列された多数の色
フィルタセグメントを有する。同図は、これらの構成を
表示の便宜上、いくぶん誇張して概念的に示している。Referring to FIG. 1, an embodiment in which the present invention is applied to an imaging optical system of a camera having a color solid-state image sensor 10 is shown. The color solid-state image sensor 10 is a charge transfer device such as a COD, and its image sensor array 12
A color separation filter 14 is disposed on the surface of. The color separation filter 14 has a large number of color filter segments arranged to separate the light directed toward each imaging cell of the imaging cell array 12 into three separated colors. The figure conceptually shows these configurations in a somewhat exaggerated manner for convenience of display.
撮像セルアレイ１２の前方には、アレイ１２の主光軸１
８−ヒに本実施例では約１．５倍の倍率を有するズーム
レンズ１８が配設されている。レンズ１８は、本実施例
では前レンズ群２０と後レンズ群２２の２群のレンズか
らなる凹凸型ズームレンズである。その原理的構成を”
第３図に示すように、前レンズ群２０が光軸１６方向Ａ
に前後に可動であり、後レンズ群２２が光軸１６方向Ｂ
に前後に可動し、ズーム機能を実現している。第１図に
示すレンズ位置が広角端状態、第２図に示すレンズ位置
が望遠端状態である。以降の図において、第１図に示す
構成要素と同様の要素は同じ参照符号で示されている。In front of the imaging cell array 12, there is a main optical axis 1 of the array 12.
In this embodiment, a zoom lens 18 having a magnification of approximately 1.5 times is disposed at 8-H. In this embodiment, the lens 18 is a concave-convex zoom lens consisting of two lens groups: a front lens group 20 and a rear lens group 22. Its basic structure
As shown in FIG. 3, the front lens group 20 is
The rear lens group 22 is movable back and forth in the direction B of the optical axis 16.
It can move forward and backward to provide a zoom function. The lens position shown in FIG. 1 is the wide-angle end state, and the lens position shown in FIG. 2 is the telephoto end state. In the following figures, elements similar to those shown in FIG. 1 are designated with the same reference numerals.
前レンズ群２０の前方の光軸１６上には、絞り２４が、
さらにその前方には光学的低域通過フィルタ２６が配設
されている。低域フィルタ２６はたとえば、屈折率の異
なる透明材料の微小粒子をやはり透明な樹脂材料の平板
内に分散させたものが使用される。低域フィルタ２８は
、光軸１６上を被写界からこれに入射する入射光のうち
色分離フィルタ１２のセグメント配列の空間周波数より
実質的に高い空間周波数を有する絵柄の成分を除去する
。本実施例では、ズームレンズの前にフ→イルタ２８を
配置しており、焦点距離の変化に伴って除去すべき周波
数の成分は結像側で変化する。しかし本実施例の場合、
低倍率であり、実用上問題ない。これによって、そのよ
うな空間的に高域の絵柄を表わす入射光により固体撮像
素子１０からの再生画像に偽色が発生するのを防ぐ。On the optical axis 16 in front of the front lens group 20, an aperture 24 is provided.
Furthermore, an optical low-pass filter 26 is arranged in front of it. The low-pass filter 26 is, for example, one in which fine particles of transparent materials having different refractive indexes are dispersed within a flat plate of a transparent resin material. The low-pass filter 28 removes image components having a spatial frequency substantially higher than the spatial frequency of the segment array of the color separation filter 12 from among the incident light incident on the optical axis 16 from the object field. In this embodiment, a filter 28 is placed in front of the zoom lens, and the frequency component to be removed changes on the imaging side as the focal length changes. However, in the case of this example,
The magnification is low and poses no practical problems. This prevents false colors from occurring in the reproduced image from the solid-state image sensor 10 due to the incident light representing such spatially high-frequency patterns.
本実施例は、レンズ１８の前方部分では被写界から入射
する入射光が実質的に平行光であることに看目し、低域
フィルタ２６をレンズ１８の前方に配設している。これ
によりレンズ１８には、従来のように低域フィルタ２６
の配設のための空間を形成する必要がなく、したがって
レンズ１８は、フランジバックの短いものを使用するこ
とが可能になる。In this embodiment, the low-pass filter 26 is disposed in front of the lens 18 in view of the fact that in the front part of the lens 18, the incident light from the object field is substantially parallel light. As a result, the lens 18 is equipped with a low-pass filter 26 as in the conventional case.
Therefore, it is possible to use a lens 18 with a short flange back.
そのため、従来と同し明るさを得るためにはレンズ径の
小さいレンズを使用することができる。Therefore, in order to obtain the same brightness as before, a lens with a smaller lens diameter can be used.
低域フィルタ２６は本来、撮像素子１０の撮像セルの配
列に対して光軸１６について回転方向の位置的整合を精
密にとる必要がある。しかし本実施例では、低域フィル
タ２６がレンズ１８の前方に配設されているため、その
調整作業を行ないやすく、また高精度の取付は装置を必
要としない。たとえば、撮像素子１０から出力される映
像信号を映像モニタに再生してその再生画像を見ながら
この作業を行なうことができる。The low-pass filter 26 originally needs to be precisely aligned in the rotational direction with respect to the optical axis 16 with respect to the array of imaging cells of the imaging device 10. However, in this embodiment, since the low-pass filter 26 is disposed in front of the lens 18, its adjustment work is easy to perform, and high-precision mounting does not require any equipment. For example, this work can be performed while reproducing the video signal output from the image sensor 10 on a video monitor and viewing the reproduced image.
比較のために従来の結像光学系の例を第６図に示す。こ
の従来例では、撮像素子１０の光軸１６上に撮像セルア
レイ１２から被写界に向って、低域通過フィルタ２６、
絞り２４、ズームレンズ５０がこの順に配列されている
。レンズ５０は約１．５倍のズーム機能を有し、その後
レンズ群５２が光軸１６方向Ａに前後に可動であり、こ
れによってズーム機能を実現している。この従来例では
、低域フィルタ２６が撮像素子１０の直前に配置されて
いるため、レンズ５０は、そのフランジパックを長くと
るように設計されている。したがってレンズ５０は、大
口径で焦点距離の長いものを使用しなければならず、光
学系全体がこれによって大型化する。For comparison, an example of a conventional imaging optical system is shown in FIG. In this conventional example, a low-pass filter 26,
The aperture 24 and the zoom lens 50 are arranged in this order. The lens 50 has a zoom function of approximately 1.5 times, and thereafter the lens group 52 is movable back and forth in the direction A of the optical axis 16, thereby realizing the zoom function. In this conventional example, since the low-pass filter 26 is placed just in front of the image sensor 10, the lens 50 is designed to have a long flange pack. Therefore, the lens 50 must have a large aperture and a long focal length, which increases the size of the entire optical system.
第１図に示す本発明の実施例にて、これと同じ明るさお
よびズーム倍率の仕様を実現した場合の設計値例を第１
表に示す。この例は、明るさＦが３．５．広角端焦点距
離ｆＷが１９．８９５ｍｍ、望遠端焦点圧＠ｆＴが２８
．８８ｍ１１１のズームレンズで、第１図に示すように
５枚のレンズ１８の１０面と低域通過フィルタ２６の２
面とで構成されている。絞り２４は第２面と第３面との
間、または第８面と第９面との間に配置される。その有
限距離における収差図を第４図および第５図に示す。第
４図はレンズ位置が広角端状態の場合、第５図はルンズ
位置が望遠端状態の場合である。In the embodiment of the present invention shown in FIG. 1, the design value example when realizing the same specifications of brightness and zoom magnification is shown in the first example.
Shown in the table. In this example, the brightness F is 3.5. Wide-angle end focal length fW is 19.895mm, telephoto end focal pressure @fT is 28
．． As shown in FIG.
It consists of a surface. The aperture 24 is arranged between the second and third surfaces or between the eighth and ninth surfaces. Aberration diagrams at the finite distance are shown in FIGS. 4 and 5. FIG. 4 shows a case where the lens position is at the wide-angle end, and FIG. 5 shows a case where the lens position is at the telephoto end.
これらかられかるように本実施例では、光学的低域通過
フィルタ２６がレンズ系２０のアフォーカル部、たとえ
ば前方に配設されているので、結像光学系にフランジバ
ックの短いレンズが使用できる。そのため、従来と同し
明るさではかなり小口第１表
３ Ｂ、８８３ ２．５また
は１．０
４ ８７．７＋８１．７５ １．６４３２８ ４７
．’８５ −１８．４４７ ０．３４
８ ８．８！３７’１．３Ｅｌ １．８０５１Ｂ
２５．’５７ １５．９７４ １．８２
８ −９．３２８ ］’、３？ １．７２
４３．７９ −３７．４５８ ７．Ｅ１４４〜２
８２
１０ −１０．２，４９ １．７７ １．５８１４４
４０．８１１ −７．８９９ １．０６
１２ −６４．１０３ ０．８０ ＋、８０５００
．３８．６Ｅ」
このように本発明によれば、光学的低域通過フィルタが
レンズ系のアフォーカル部に配設されているので、たと
えば望遠型などのフランジパンクの短いレンズを結像光
学系に使用でき、また光学的低域通過フィルタも形状の
小さいものを使用することができる。また、射出瞳が長
くなり、カラーシェーディングの影響が小さい。したが
って結像光学系全体が従来より小型化、軽量化される。As can be seen from the above, in this embodiment, the optical low-pass filter 26 is disposed in the afocal part of the lens system 20, for example, in the front, so that a lens with a short flange back can be used in the imaging optical system. . Therefore, with the same brightness as before, it is quite small.
．． '85 -18.447 0.34 8 8.8!37'1.3El 1.8051B
25. '57 15.974 1.82 8 -9.328 ]', 3? 1.72
43.79 -37.458 7. E144-2
82 10 -10.2,49 1.77 1.58144
40.811 -7.899 1.06 12 -64.103 0.80 +, 80500
．． 38.6E'' According to the present invention, the optical low-pass filter is disposed in the afocal part of the lens system, so a short flange puncture lens such as a telephoto lens can be used in the imaging optical system. It is also possible to use a small-sized optical low-pass filter. In addition, the exit pupil is longer and the influence of color shading is smaller. Therefore, the entire imaging optical system can be made smaller and lighter than before.
第１図および第２図は、カラー固体撮像素子を有するカ
メラの結像光学系に本発明を適用した実施例を示す説明
図であり、第１図はレンズ位置が広角端状態の場合、第
２図はレンズ位置が望遠端状態の場合を示し、
゛
第３図は、第１図および第２図に示す実施例の原理的構
成示す説明図、
第４図および第５図は、第６図に示す従来例と同じ明る
さおよびズーム倍率の仕様を本発明を適用して実現した
場合の設計例の有限距離における収差図を示し、第４図
はレンズ位置が広角端状態の場合、第５図はレンズ位置
が望遠端状態の場合であり、
第６図は従来の固体撮像素子カメラの結像光学系の例を
示す第１図と同様の図である。
主要部分の符号の説明
１０、、、カラー固体撮像素子
１２、、、撮像セルアレイ
１Ｂ、、、レンズ
２Ｂ、、、光学的低域通過フィルタ
特許出願人 冨士写真フィルム株式会社富士写真光機株
式会社
代 理 人 番数 孝雄
先山 隆夫1 and 2 are explanatory diagrams showing an embodiment in which the present invention is applied to an imaging optical system of a camera having a color solid-state image sensor. Figure 2 shows the lens position at the telephoto end.
゛Figure 3 is an explanatory diagram showing the basic configuration of the embodiment shown in Figures 1 and 2. Figures 4 and 5 are the same brightness and zoom magnification specifications as the conventional example shown in Figure 6. 4 shows aberration diagrams at a finite distance of a design example when realized by applying the present invention, FIG. 4 shows the case where the lens position is at the wide-angle end state, and FIG. 5 shows the case where the lens position is at the telephoto end state, FIG. 6 is a diagram similar to FIG. 1, showing an example of an imaging optical system of a conventional solid-state image sensor camera. Explanation of symbols for main parts 10, Color solid-state image sensor 12, Imaging cell array 1B, Lens 2B, Optical low-pass filter Patent applicant Fuji Photo Film Co., Ltd. Fuji Photo Koki Co., Ltd. Number of persons Takao Sakiyama Takao
Claims (1)
ー固体撮像素子の該撮像セルアレイに被写界の像を結像
する固体撮像素子用結像光学系において、該結像光学系
は、 前記撮像セルアレイの光軸上に配設され、該撮像セルア
レイに前記像を結像するレンズと、該レンズに対して前
記カラー固体撮像素子とは反対の前記光軸上に配設され
、前記被写界から入射する光のうち前記色分離フィルタ
の色フィルタセグメント配列の空間周波数より高い空間
周波数を有する前記像の成分を除去する光学フィルタと
を有することを特徴とする固体撮像素子用結像光学系。[Scope of Claims] An imaging optical system for a solid-state imaging device that forms an image of a field on an imaging cell array of a color solid-state imaging device in which a color separation filter is disposed on the imaging cell array. The optical system includes a lens that is disposed on the optical axis of the imaging cell array and forms the image on the imaging cell array, and a lens that is disposed on the optical axis opposite to the color solid-state image sensor with respect to the lens. and an optical filter that removes a component of the image having a spatial frequency higher than a spatial frequency of a color filter segment array of the color separation filter from among the light incident from the object field. Imaging optical system for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63061846A JP2716041B2 (en) | 1988-03-17 | 1988-03-17 | Imaging optical system for solid-state imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63061846A JP2716041B2 (en) | 1988-03-17 | 1988-03-17 | Imaging optical system for solid-state imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01235920A true JPH01235920A (en) | 1989-09-20 |
| JP2716041B2 JP2716041B2 (en) | 1998-02-18 |
Family
ID=13182862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63061846A Expired - Fee Related JP2716041B2 (en) | 1988-03-17 | 1988-03-17 | Imaging optical system for solid-state imaging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2716041B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010197665A (en) * | 2009-02-25 | 2010-09-09 | Olympus Corp | Image pickup optical system and image pickup apparatus using the same |
| JP2012002846A (en) * | 2010-06-14 | 2012-01-05 | Olympus Corp | Imaging optical system and imaging device using the same |
| JP2013101402A (en) * | 2013-02-20 | 2013-05-23 | Olympus Corp | Imaging optical system and imaging apparatus including the same |
| JP2013109374A (en) * | 2013-02-20 | 2013-06-06 | Olympus Corp | Imaging optical system and imaging apparatus with the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62278519A (en) * | 1986-05-26 | 1987-12-03 | Sony Corp | Lens |
-
1988
- 1988-03-17 JP JP63061846A patent/JP2716041B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62278519A (en) * | 1986-05-26 | 1987-12-03 | Sony Corp | Lens |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010197665A (en) * | 2009-02-25 | 2010-09-09 | Olympus Corp | Image pickup optical system and image pickup apparatus using the same |
| US8441743B2 (en) | 2009-02-25 | 2013-05-14 | Olympus Corporation | Image pickup optical system and image pickup apparatus using the same |
| US8508836B2 (en) | 2009-02-25 | 2013-08-13 | Olympus Corporation | Image pickup optical system and image pickup apparatus using the same |
| US8976462B2 (en) | 2009-02-25 | 2015-03-10 | Olympus Corporation | Image pickup optical system and image pickup apparatus using the same |
| JP2012002846A (en) * | 2010-06-14 | 2012-01-05 | Olympus Corp | Imaging optical system and imaging device using the same |
| JP2013101402A (en) * | 2013-02-20 | 2013-05-23 | Olympus Corp | Imaging optical system and imaging apparatus including the same |
| JP2013109374A (en) * | 2013-02-20 | 2013-06-06 | Olympus Corp | Imaging optical system and imaging apparatus with the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2716041B2 (en) | 1998-02-18 |
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