JP2565287B2 - Imaging device - Google Patents
Imaging deviceInfo
- Publication number
- JP2565287B2 JP2565287B2 JP5180549A JP18054993A JP2565287B2 JP 2565287 B2 JP2565287 B2 JP 2565287B2 JP 5180549 A JP5180549 A JP 5180549A JP 18054993 A JP18054993 A JP 18054993A JP 2565287 B2 JP2565287 B2 JP 2565287B2
- Authority
- JP
- Japan
- Prior art keywords
- focal plane
- light receiving
- image
- optical system
- light
- 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.)
- Expired - Lifetime
Links
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- Facsimile Heads (AREA)
- Facsimile Scanning Arrangements (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は航空機や人工衛星等に搭
載して地球探査等に利用する撮像装置に関し、特に集光
光学系により第１焦点面に結像される像をリレー光学系
により第２焦点面に結像し、この第２焦点面に一次元ア
レイセンサを配設している撮像装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus mounted on an aircraft, an artificial satellite or the like and used for earth exploration, etc., and particularly, an image formed on a first focal plane by a condensing optical system by a relay optical system. The present invention relates to an image pickup apparatus which forms an image on a second focal plane and arranges a one-dimensional array sensor on the second focal plane.
【０００２】[0002]
【従来の技術】従来のこの種の撮像装置は、図３に示す
ように、被写体の撮像光２０を第１焦点面に集光する集
光光学系２１と、第１焦点面に配設されるスリット板２
２と、第１焦点面に結像される像を再び第２焦点面に結
像するリレー光学系２３と、複数の受光素子２５を有し
第２焦点面に配設される一次元アレイセンサ２４とを備
えている。2. Description of the Related Art As shown in FIG. 3, a conventional imaging device of this type is provided with a condensing optical system 21 for condensing imaging light 20 of an object on a first focal plane and a first focal plane. Slit plate 2
2, a relay optical system 23 that again forms an image formed on the first focal plane on the second focal plane, and a one-dimensional array sensor having a plurality of light receiving elements 25 and arranged on the second focal plane. 24 and.
【０００３】一次元アレイセンサ２４は、図４（ｅ）に
示すように、複数の受光素子が密接して一列に配置され
ているセンサであり、図示しない駆動回路が各受光素子
を電気的に走査することにより、各受光素子から画像信
号を検出している。この一次元アレイセンサの受光素子
の配列方向に対して、被写体の結像が直角方向に移動し
ていくように撮像装置を航空機や人工衛星等に搭載すれ
ば、被写体の二次元画像を得ることができる。As shown in FIG. 4 (e), the one-dimensional array sensor 24 is a sensor in which a plurality of light receiving elements are closely arranged in a line, and a drive circuit (not shown) electrically connects each light receiving element. The image signal is detected from each light receiving element by scanning. A two-dimensional image of the subject can be obtained by installing an imaging device on an aircraft or artificial satellite so that the image formation of the subject moves in a direction perpendicular to the array direction of the light receiving elements of this one-dimensional array sensor. You can
【０００４】ところで、スリット板２２には、一次元ア
レイセンサ２４の受光素子列に対応して一本のスリット
２６を設けている。このスリット２６を設けることによ
って、光学系の収差により本来受光すべきではない撮像
光が一次元アレイセンサ２４の受光素子に入射して画質
を劣化させるのを防止している。By the way, the slit plate 22 is provided with one slit 26 corresponding to the light receiving element array of the one-dimensional array sensor 24. By providing the slit 26, it is possible to prevent the image pickup light which should not be received due to the aberration of the optical system from entering the light receiving element of the one-dimensional array sensor 24 and deteriorating the image quality.
【０００５】[0005]
【発明が解決しようとする課題】上述した従来の撮像装
置では、光学系の収差に起因する画質劣化を防止するた
めに、一本のスリットを有するスリット板を第１焦点面
に配設している。しかし、このスリットは長手方向に連
続して開いており、光学系の収差によって第１焦点面か
らの撮像光が長手方向に広がるので、一次元アレイセン
サの各受光素子には、本来入射すべきではない隣接受光
素子に対応する部分の入射光が漏込んでくる。このた
め、受光素子間の濃淡が不明確になり画質が劣化すると
いう問題点がある。In the above-mentioned conventional image pickup apparatus, a slit plate having one slit is arranged on the first focal plane in order to prevent image quality deterioration due to aberration of the optical system. There is. However, this slit is continuously opened in the longitudinal direction, and the imaging light from the first focal plane spreads in the longitudinal direction due to the aberration of the optical system. Therefore, it should be originally incident on each light receiving element of the one-dimensional array sensor. The incident light of the part corresponding to the adjacent light receiving element leaks in. For this reason, there is a problem that the shade between the light receiving elements becomes unclear and the image quality deteriorates.
【０００６】例えば、図４（ａ）に示すように、一次元
アレイセンサの各受光素子に対応して黒線と白線とが交
互に配列しているテストパターンを撮像した場合、第１
焦点面の結像を光度を縦軸にして表示すれば、集光光学
系の収差により図４（ｂ）のように境界が少しぼけて結
像する。更に、第２焦点面では、リレー光学系の収差に
より図４（ｃ）のように更に境界がぼけて結像する。従
って、第２焦点面に配設された一次元アレイセンサの各
受光素子の出力は、図４（ｄ）に示すように、レベル変
化が少なくなり、濃淡が不明瞭な画質の劣化した画像信
号となる。For example, as shown in FIG. 4A, when a test pattern in which black lines and white lines are alternately arranged corresponding to each light receiving element of the one-dimensional array sensor is imaged,
If the image formation on the focal plane is displayed with the luminosity as the vertical axis, the image is formed with the boundary slightly blurred as shown in FIG. 4B due to the aberration of the condensing optical system. Further, on the second focal plane, due to the aberration of the relay optical system, the boundary is further blurred as shown in FIG. Therefore, as shown in FIG. 4D, the output of each light receiving element of the one-dimensional array sensor arranged on the second focal plane has a small level change, and the image signal with deteriorated image quality in which the gradation is unclear Becomes
【０００７】本発明の目的は、光学系の収差に起因する
画質劣化を低減できる撮像装置を提供することにある。An object of the present invention is to provide an image pickup apparatus capable of reducing image quality deterioration caused by aberration of an optical system.
【０００８】[0008]
【課題を解決するための手段】本発明の撮像装置は、被
写体からの光を第１焦点面に集光する第１の集光手段
と、前記第１焦点面に結像される像を再び第２焦点面に
結像する第２の集光手段と、複数の受光素子が配置され
前記第２焦点面に配設される受光センサと、この受光セ
ンサの前記複数の受光素子にそれぞれ対応して開けられ
た複数の***を有し前記第１焦点面に配設されるマスク
板とを備える。また、前記マスク板は、等間隔かつ互い
違いに前後２列に配置される前記複数の***を有してい
る。SUMMARY OF THE INVENTION An image pickup apparatus of the present invention includes a first condensing means for condensing light from a subject on a first focal plane and an image formed on the first focal plane again. It corresponds to the second light-collecting means for forming an image on the second focal plane, the light-receiving sensor in which a plurality of light-receiving elements are arranged and arranged in the second focal plane, and the plurality of light-receiving elements of the light-receiving sensor. A mask plate having a plurality of small holes formed in the first focal plane. Further, the mask plate has the plurality of small holes which are arranged in two rows in front and back at equal intervals and alternately.
【０００９】[0009]
【実施例】次に本発明について図面を参照して説明す
る。The present invention will be described below with reference to the drawings.
【００１０】本発明の撮像装置の光学系は、図１に示す
ように、被写体の撮像光１０を第１焦点面に集光する集
光光学系１１と、第１焦点面に配設されるマスク板１２
と、第１焦点面に結像される像を再び第２焦点面に結像
するリレー光学系１３と、複数の受光素子１５を有し第
２焦点面に配設される一次元アレイセンサ１４とを備え
ている。As shown in FIG. 1, the optical system of the image pickup apparatus of the present invention is arranged on the first focal plane and a condensing optical system 11 for condensing the image pickup light 10 of the object on the first focal plane. Mask plate 12
A relay optical system 13 for forming an image formed on the first focal plane again on the second focal plane; and a one-dimensional array sensor 14 having a plurality of light receiving elements 15 and arranged on the second focal plane. It has and.
【００１１】一次元アレイセンサ１４は、図２（ｇ）に
示すように、複数の受光素子が等間隔かつ互い違いに前
後２列に配置されているセンサであり、図示しない駆動
回路が各受光素子列を電気的に走査することにより、各
受光素子から画像信号を検出する。また、この撮像装置
を搭載した航空機や人工衛星等の移動方向と受光素子列
の配列方向とを直交させることにより、被写体の結像が
一次元アレイセンサの受光素子列に対して直角方向に移
動していくので、各受光素子列から読出した信号を合成
することにより被写体の二次元画像を得ることができ
る。As shown in FIG. 2 (g), the one-dimensional array sensor 14 is a sensor in which a plurality of light receiving elements are arranged at equal intervals and staggered in two rows in the front and rear. An image signal is detected from each light receiving element by electrically scanning the column. Also, by making the moving direction of an aircraft or artificial satellite equipped with this imaging device orthogonal to the array direction of the light receiving element array, the image formation of the subject moves in the direction perpendicular to the light receiving element array of the one-dimensional array sensor. Therefore, a two-dimensional image of the subject can be obtained by synthesizing the signals read from the respective light receiving element arrays.
【００１２】ところで、マスク板１２には、一次元アレ
イセンサ１４の各受光素子１５にそれぞれ対応するよう
に複数の***１６が開けられている。すなわち、一次元
アレイセンサ１４の各受光素子１５の配置とマスク板１
２の各***１６の配置は同一であり、リレー光学系１３
で生じる収差による影響が低減できるように設定してい
る。By the way, a plurality of small holes 16 are formed in the mask plate 12 so as to correspond to the respective light receiving elements 15 of the one-dimensional array sensor 14. That is, the arrangement of each light receiving element 15 of the one-dimensional array sensor 14 and the mask plate 1
The arrangement of the small holes 16 of 2 is the same, and the relay optical system 13
The setting is made so that the influence of the aberration caused in 1 can be reduced.
【００１３】例えば、図２（ａ）に示すように、一次元
アレイセンサ１４の各受光素子１５に対応して黒線と白
線とが交互に配列しているテストパターンを撮像した場
合、第１焦点面における結像の光度を縦軸にして表示す
れば、集光光学系１１の収差により図２（ｂ）のように
境界が少しぼけて結像する。この第１焦点面の結像は、
マスク板１２およびリレー光学系１３を通過して第２焦
点面に結像する。For example, as shown in FIG. 2A, when a test pattern in which black lines and white lines are alternately arranged corresponding to each light receiving element 15 of the one-dimensional array sensor 14 is imaged, If the luminous intensity of the image on the focal plane is displayed on the vertical axis, the image is formed with a slightly blurred boundary as shown in FIG. 2B due to the aberration of the condensing optical system 11. The image formation of this first focal plane is
An image is formed on the second focal plane through the mask plate 12 and the relay optical system 13.
【００１４】ここで、第１焦点面に配設されるマスク板
１２の***は、図２（ｃ）に示すように、等間隔に前後
２列に配置されているので、第２焦点面に配設される一
次元アレイセンサ１４の受光素子の前列側に対応する結
像は、図２（ｄ）に示すようになり、一方、受光素子の
後列側に対応する結像は、図２（ｅ）に示すようにな
る。すなわち、隣接受光素子に対応する部分の入射光
が、一次元アレイセンサの各受光素子に漏込んでくるの
を抑えることができる。従って、一次元アレイセンサの
受光素子の出力は、図２（ｆ）に示すように、濃淡が明
瞭な画像信号となり、光学系の収差に起因する画質劣化
を低減できる。Here, since the small holes of the mask plate 12 arranged on the first focal plane are arranged in two rows in front and back at equal intervals, as shown in FIG. The image formation corresponding to the front row side of the light receiving elements of the arranged one-dimensional array sensor 14 is as shown in FIG. 2D, while the image formation corresponding to the rear row side of the light receiving elements is shown in FIG. e). That is, it is possible to prevent the incident light of the portion corresponding to the adjacent light receiving element from leaking into each light receiving element of the one-dimensional array sensor. Therefore, the output of the light receiving element of the one-dimensional array sensor becomes an image signal with a clear gradation, as shown in FIG. 2F, and image quality deterioration due to aberration of the optical system can be reduced.
【００１５】[0015]
【発明の効果】以上説明したように本発明によれば、集
光光学系が第１焦点面に結像する像をリレー光学系によ
り第２焦点面に結像し、この第２焦点面に複数の受光素
子が配列した一次元アレイセンサを配設する撮像装置に
おいて、一次元アレイセンサの複数の受光素子を等間隔
に前後２列に配列し、また、第１焦点面には一次元アレ
イセンサの各受光素子にそれぞれ対応して開けられた複
数の***を有するマスク板を配設することにより、一次
元アレイセンサの各受光素子に、隣接受光素子に対応す
る部分の入射光が漏込んでくるのを抑えることができる
ので、従来のようなスリット板を使用した場合に比べ
て、光学系の収差の影響を更に低減して濃淡が明瞭な画
像信号を得ることができる。As described above, according to the present invention, the image formed by the focusing optical system on the first focal plane is formed on the second focal plane by the relay optical system, and the image is formed on the second focal plane. In an imaging device having a one-dimensional array sensor in which a plurality of light-receiving elements are arranged, a plurality of light-receiving elements of the one-dimensional array sensor are arranged at equal intervals in front and rear two rows, and a one-dimensional array is provided on a first focal plane. By arranging a mask plate having a plurality of small holes opened corresponding to each light receiving element of the sensor, incident light of a portion corresponding to an adjacent light receiving element leaks into each light receiving element of the one-dimensional array sensor. Since it can be prevented from coming out, it is possible to further reduce the influence of the aberration of the optical system and obtain an image signal having a clear contrast, as compared with the case of using a conventional slit plate.
【図１】本発明の一実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.
【図２】本実施例の動作を説明するための図である。FIG. 2 is a diagram for explaining the operation of this embodiment.
【図３】従来の撮像装置の光学系の一例を示す図であ
る。FIG. 3 is a diagram showing an example of an optical system of a conventional image pickup apparatus.
【図４】従来の撮像装置の動作を説明するための図であ
る。FIG. 4 is a diagram for explaining the operation of the conventional imaging device.
１１ 集光光学系 １２ マスク板 １３ リレー光学系 １４ 一次元アレイセンサ １５ 受光素子 １６ *** 11 Condensing optical system 12 Mask plate 13 Relay optical system 14 One-dimensional array sensor 15 Light receiving element 16 Small hole
Claims (2)
第１の集光手段と、前記第１焦点面に結像される像を再
び第２焦点面に結像する第２の集光手段と、複数の受光
素子が配置され前記第２焦点面に配設される受光センサ
と、この受光センサの前記複数の受光素子にそれぞれ対
応して開けられた複数の***を有し前記第１焦点面に配
設されるマスク板とを備えることを特徴とする撮像装
置。1. A first condensing means for condensing light from an object on a first focal plane, and a second condensing means for forming an image formed on the first focal plane on the second focal plane again. The light collecting means, a light receiving sensor having a plurality of light receiving elements arranged on the second focal plane, and a plurality of small holes formed corresponding to the plurality of light receiving elements of the light receiving sensor are provided. An image pickup apparatus comprising: a mask plate disposed on a first focal plane.
前後２列に配置される前記複数の***を有していること
を特徴とする請求項１記載の撮像装置。2. The image pickup device according to claim 1, wherein the mask plate has the plurality of small holes arranged in two rows in the front and rear rows at equal intervals and in a staggered manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5180549A JP2565287B2 (en) | 1993-07-22 | 1993-07-22 | Imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5180549A JP2565287B2 (en) | 1993-07-22 | 1993-07-22 | Imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0738722A JPH0738722A (en) | 1995-02-07 |
| JP2565287B2 true JP2565287B2 (en) | 1996-12-18 |
Family
ID=16085225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5180549A Expired - Lifetime JP2565287B2 (en) | 1993-07-22 | 1993-07-22 | Imaging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2565287B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5835228A (en) * | 1996-01-19 | 1998-11-10 | Dainippon Screen Mfg. Co., Ltd. | Image pickup apparatus, density measuring optical system and scanning optical microscope |
-
1993
- 1993-07-22 JP JP5180549A patent/JP2565287B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0738722A (en) | 1995-02-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960813 |