JPH0341328A - Infrared image sensing optical apparatus - Google Patents
Infrared image sensing optical apparatusInfo
- Publication number
- JPH0341328A JPH0341328A JP1175691A JP17569189A JPH0341328A JP H0341328 A JPH0341328 A JP H0341328A JP 1175691 A JP1175691 A JP 1175691A JP 17569189 A JP17569189 A JP 17569189A JP H0341328 A JPH0341328 A JP H0341328A
- Authority
- JP
- Japan
- Prior art keywords
- detector
- imaging optical
- cold shield
- optical system
- exit pupil
- 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 125
- 210000001747 pupil Anatomy 0.000 claims abstract description 60
- 238000003384 imaging method Methods 0.000 claims abstract description 55
- 230000005855 radiation Effects 0.000 claims abstract description 19
- 238000003331 infrared imaging Methods 0.000 claims description 23
- 230000035945 sensitivity Effects 0.000 abstract description 13
- 238000001816 cooling Methods 0.000 abstract description 8
- 230000004907 flux Effects 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract 2
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 239000000758 substrate Substances 0.000 description 4
- 241000234479 Narcissus Species 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Radiation Pyrometers (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野コ 本発明は、赤外線撮像光学装置に関するものである。[Detailed description of the invention] [Industrial application fields] The present invention relates to an infrared imaging optical device.
［従来の技術］ 従来のこの種装置は、第９図に示す様な構造であった。[Conventional technology] A conventional device of this type had a structure as shown in FIG.
図において、対物レンズ１０２によって中間結像面に結
像された撮像対象の像はリレーレンズ１０３によって赤
外線検知器１０４の受光面に結像される。一般に赤外線
用の光電素子は禁制帯幅が狭く暗電流が流れやすいため
、検知器１０４はリレーレンズ１０３からの有効光束を
通過させるための開口部を有し周囲の物体からの放射光
（熱輻射）を遮蔽するコールドシールド１０５によって
囲まれ、８０に程度の温度に冷却さされている。このよ
うな構成の赤外線撮像光学装置において、リレーレンズ
１０３からの光束の光路を遮らず、かつ撮像対象以外の
物体から検知器１０４に入射する熱輻射を低減するには
、コールドシールド１０５開口部と撮像光学系の射出瞳
を合致させることが提案されている。In the figure, an image of the object formed on an intermediate image plane by an objective lens 102 is formed on a light receiving surface of an infrared detector 104 by a relay lens 103. In general, photoelectric elements for infrared light have a narrow forbidden band width, and dark current tends to flow easily. ) is surrounded by a cold shield 105 that shields it, and is cooled to a temperature of about 80°C. In the infrared imaging optical device having such a configuration, in order to not block the optical path of the light beam from the relay lens 103 and to reduce thermal radiation that enters the detector 104 from objects other than the object to be imaged, the cold shield 105 opening and It has been proposed to match the exit pupils of imaging optical systems.
［発明が解決しようとする課題］
シカシ、上記の如き従来技術においては、以下のような
問題点があった。[Problems to be Solved by the Invention] The conventional techniques described above have the following problems.
まず、コールドシールド開口部の検知器受光面からの高
さは射出瞳の位置に対応させなければならないため、コ
ールドシールドの小型化を図ることができず、冷却負荷
を軽減することができないという問題がある。特に検知
器の光電素子が二次元に多数配列されていて受光面積が
大きい場合には、射出瞳と結像面（受光面）との距離が
長くなるため、それに応じてコールドシールドも大型化
し冷却負荷が大きなものとなってしまう。First, the height of the cold shield opening from the detector light receiving surface must correspond to the position of the exit pupil, which makes it impossible to downsize the cold shield and reduce the cooling load. There is. In particular, when a large number of photoelectric elements in a detector are arranged in two dimensions and the light-receiving area is large, the distance between the exit pupil and the imaging surface (light-receiving surface) becomes longer, so the cold shield also becomes larger and cooled accordingly. This results in a heavy load.
また、コールドシールドの開口部の大きさは固定された
ものであるので、撮像光学系の開口絞りの大きさを変え
ると射出瞳とコールドシールド開口部の大きさが一致し
なくなるという問題点がある。即ち、開口絞りを絞った
場合、コールドシールド開口部より射出瞳の大きさが小
さくなり撮像対象以外の物体からの熱輻射が検知器に入
射してしまい、検知器の感度が低下してしまう。In addition, since the size of the cold shield aperture is fixed, there is a problem that if the size of the aperture stop of the imaging optical system is changed, the exit pupil and the cold shield aperture size will not match. . That is, when the aperture stop is stopped down, the size of the exit pupil is smaller than that of the cold shield aperture, and thermal radiation from objects other than the object to be imaged enters the detector, reducing the sensitivity of the detector.
更に、赤外線用の検知器は水分が受光面上に結露すると
感度が損なわれてしまう為、一般に検知器受光部を真空
中に保てる様に光学窓部材によって検知器の周囲（コー
ルドシールドの外側）を密閉することが多いが、断熱効
果の点から真空層はある程度厚くする必要があり、装置
が更に大型化してしまうという問題がある。Furthermore, infrared detectors lose their sensitivity if moisture condenses on the light-receiving surface, so generally an optical window is placed around the detector (outside the cold shield) to keep the detector light-receiving part in a vacuum. However, the vacuum layer needs to be thicker to some extent for insulation purposes, which poses the problem of further increasing the size of the device.
加えて、前述したようにコールドシールド開口部の位置
及び形状は固定されたものにせざるを得ない為、対物レ
ンズの倍率を変えると射出瞳とコールドシールド開口部
が合致しなくなり、検知器の感度が低下してしまうとい
う問題点もある。In addition, as mentioned above, the position and shape of the cold shield aperture must be fixed, so if the magnification of the objective lens is changed, the exit pupil and the cold shield aperture will no longer match, which will affect the sensitivity of the detector. There is also the problem that the value decreases.
本願発明は上記の問題点に鑑みてなされたものであり、
第１の発明（請求項１）は検知器の冷却効率の向上を図
ることができるとともに、検知器の感度を低下させずに
開口絞りの大きさを変えることができる赤外線撮像光学
装置を提供することを目的としたものである。The present invention has been made in view of the above problems,
The first invention (claim 1) provides an infrared imaging optical device that can improve the cooling efficiency of the detector and can change the size of the aperture stop without reducing the sensitivity of the detector. It is intended for this purpose.
また、第２の発明（請求項３）は検知器の感度を低下さ
せずに装置の小型化を図ることができる赤外線撮像光学
装置を提供することを目的としたものである。Moreover, the second invention (claim 3) aims to provide an infrared imaging optical device that can be miniaturized without reducing the sensitivity of the detector.
さらに、第３の発明（請求項４）は対物レンズの倍率を
変えた場合でも高い冷却効率や感度を維持することがで
きる赤外線撮像光学装置を提供することを目的としたも
のである。Furthermore, the third invention (claim 4) aims to provide an infrared imaging optical device that can maintain high cooling efficiency and sensitivity even when the magnification of the objective lens is changed.
［課題を解決するための手段］
第１の発明の赤外線撮像光学装置は、対物レンズとリレ
ーレンズを有する撮像光学系と、該撮像光学系の最終結
像面の位置に受光面が一致するように配置された赤外線
検知器と、前記撮像光学系からの光束が通過する開口部
を有して前記検知器を囲むように配置され、前記検知器
周囲からの熱輻射を遮蔽するコールドシールドとを備え
た赤外線撮像光学装置てあって、前述した課題を達成す
るために前記コールドシールドの開口部か前記撮像光学
系の射出瞳あるいは射出瞳と共役な位置に合致するとと
もに、前記撮像光学系の開口絞りの像側の面が鏡面で構
成されたことを特徴とする赤外線撮像光学装置である。[Means for Solving the Problems] The infrared imaging optical device of the first invention includes an imaging optical system having an objective lens and a relay lens, and a light-receiving surface that is aligned with the position of the final imaging surface of the imaging optical system. an infrared detector disposed in the imaging optical system; and a cold shield disposed to surround the detector and having an opening through which a light flux from the imaging optical system passes, and shielding thermal radiation from around the detector. In order to achieve the above-mentioned object, there is provided an infrared imaging optical device equipped with an aperture of the cold shield that matches the exit pupil of the imaging optical system or a position conjugate to the exit pupil, and an aperture of the imaging optical system. This is an infrared imaging optical device characterized in that the image-side surface of the aperture is configured with a mirror surface.
第２の発明の赤外線撮像光学装置は、対物レンズとリレ
ーレンズを有する撮像光学系と、該撮像光学系の最終結
像面の位置に受光面が一致するように配置された赤外線
検知器と、該検知器の周囲を密閉する光学窓部材と、該
光学窓部材を支持する支持部材を有する赤外線撮像光学
装置であって、前述した課題を達成するために前記光学
窓部材が前記撮像光学系の射出瞳あるいは射出瞳と共役
な位置に合致するとともに、前記支持部月の検知器側の
面が鏡面で構成されたことを特徴とする赤外線撮像光学
装置である。An infrared imaging optical device according to a second aspect of the invention includes: an imaging optical system having an objective lens and a relay lens; an infrared detector disposed such that a light receiving surface coincides with a position of a final imaging surface of the imaging optical system; An infrared imaging optical device having an optical window member that seals the periphery of the detector and a support member that supports the optical window member, wherein the optical window member is connected to the imaging optical system in order to achieve the above-described object. The infrared imaging optical device is characterized in that the surface of the support portion on the detector side is formed of a mirror surface, which coincides with the exit pupil or a position conjugate with the exit pupil.
第３の発明の撮像光学装置は、対物レンズとリレーレン
ズを有する撮像光学系と、該撮像光学系の最終結像面の
位置に受光面が一致するように配置された赤外線検知器
と、前記撮像光学系からの光束が通過する開口部を有し
て前記検知器を囲むように配置され、前記検知器周囲か
らの熱輻射を遮蔽するコールドシールドとを備えた赤外
線撮像光学装置であって、前述した課題の達成のために
前記撮像光学系が、前記対物レンズを変倍した場合にあ
っても、射出瞳あるいは射出瞳と共役な位置が常に前記
コールドシールドの開口部に合致する変倍光学系で構成
されたことを特徴とする赤外線撮像光学装置である。An imaging optical device according to a third aspect of the invention includes: an imaging optical system having an objective lens and a relay lens; an infrared detector disposed such that a light receiving surface coincides with a position of a final image forming surface of the imaging optical system; An infrared imaging optical device comprising: a cold shield that has an opening through which a light beam from an imaging optical system passes and is arranged to surround the detector, and that shields thermal radiation from around the detector; In order to achieve the above-mentioned problem, the imaging optical system is a variable magnification optical system in which the exit pupil or a position conjugate to the exit pupil always matches the opening of the cold shield even when the objective lens is magnified. This is an infrared imaging optical device characterized by being configured as a system.
なお、本明細書において「射出瞳とコールドシールド開
口部（又は光学窓部材）が合致する」とは、「射出瞳と
開口部（又は光学窓部材）の位置が一致し、かつ大きさ
も等しい」ことを言い、以下「開口整合する」とも表現
する。In this specification, "the exit pupil and the cold shield opening (or the optical window member) match" means "the exit pupil and the opening (or the optical window member) match in position and are equal in size." This is also referred to as "aperture matching" hereinafter.
［作 用］
第１の発明においては、射出瞳とコールドシールドの開
口部が合致している（一般に光学設計において射出瞳の
位置及び大きさは所望の値とすることが可能であり、対
物レンズの設計によってコールドシールド開口部と光学
系全体の射出瞳を合致させることができる）とともに開
口絞りの像側の面が鏡面で構成されているので、コール
ドシールドの開口部形成面からの放射光は開口絞りの鏡
面で正反射され、コールドシールド開口部形成面に戻る
。即ち、周囲の常温物体からコールドシールド及び検知
器に入射する熱輻射が大幅に低減され、冷却されたコー
ルドシールド及び検知器自体の放射光が入射することに
なる（ナルシサス現象）ので冷却負荷が低減される。[Function] In the first invention, the exit pupil and the opening of the cold shield match (generally, in optical design, the position and size of the exit pupil can be set to desired values, and the objective lens (The design allows the cold shield aperture to match the exit pupil of the entire optical system) and the image-side surface of the aperture stop is made of a mirror surface, so the light emitted from the cold shield aperture forming surface is It is specularly reflected by the mirror surface of the aperture stop and returns to the cold shield aperture forming surface. In other words, the thermal radiation that enters the cold shield and detector from surrounding room-temperature objects is significantly reduced, and the cooled radiation from the cold shield and detector itself enters (Narcissus phenomenon), reducing the cooling load. be done.
また、射出瞳とコールドシールド開口部が合致している
状態から開口絞りを絞ると射出瞳の大きさが開口部より
小さくなるが、その場合でも撮像対象以外から検知器に
入射する放射光は冷却された検知器（及び支持基板）自
体からの放射光であるので、実質的にコールドシールド
開口部が絞られたことと等価になる。In addition, if the exit pupil and cold shield aperture are aligned and the aperture diaphragm is narrowed down, the size of the exit pupil will become smaller than the aperture, but even in this case, the radiation that enters the detector from sources other than the object to be imaged will be cooled. Since the light is emitted from the detector (and supporting substrate) itself, it is essentially equivalent to narrowing down the cold shield opening.
第２の発明においては、射出瞳と合致する位置に光学窓
部材が配置されており、コールドシールドはこの先学窓
部材の内側に配置されることになる。即ち、コールドシ
ールド開口部は射出瞳と合致しないが、光学窓部材の支
持部材の検知器側の面が鏡面で構成されているので、リ
レーレンズからの有効光束以外に検知器に入射するのは
冷却されたコールドシールドからの放射光だけとなる。In the second invention, the optical window member is arranged at a position that matches the exit pupil, and the cold shield is arranged inside the optical window member. In other words, although the cold shield opening does not match the exit pupil, since the surface of the support member of the optical window member on the detector side is configured with a mirror surface, only the effective light flux from the relay lens enters the detector. The only radiation is from the cooled cold shield.
即ち、検知器の感度を低下させずにコールドシールド及
び光学窓部材を従来より小型化することができる。That is, the cold shield and the optical window member can be made smaller than before without reducing the sensitivity of the detector.
また、第３の発明については対物レンズの倍率を変える
と、それに伴って射出瞳の位置及び大きさが変わってし
まうが、後述する条件を満たすように開口絞りの位置及
び大きさを調整することによって変倍後においても開口
整合が実現できる。Regarding the third invention, when the magnification of the objective lens is changed, the position and size of the exit pupil change accordingly, but the position and size of the aperture stop should be adjusted so as to satisfy the conditions described below. Therefore, aperture matching can be achieved even after changing the magnification.
［実施例］
第１図は第１発明の実施例を示す光路図である。かかる
撮像光学装置の光学系は、対物レンズ２と、対物レンズ
２によって中間結像面に結像された像を赤外線検知器４
の受光面（図中点Ａ″〜点Ａ ”の領域）に結像するリ
レーレンズ３を備えており、検知器４はリレーレンズ３
からの有効光束を通過させるための開口部を有するとと
もに周囲の物体からの熱輻射を遮蔽するコールドシール
ド５で囲まれて８０に程度の温度に冷却されている。そ
して、撮像光学系の開口絞り１とコールドシールド５開
口部は共役な関係（即ち射出瞳と開口部が合致）となっ
ており、開口絞り１の検知器４側の面は鏡面で構成され
ている。[Embodiment] FIG. 1 is an optical path diagram showing an embodiment of the first invention. The optical system of such an imaging optical device includes an objective lens 2 and an infrared detector 4 that captures an image formed by the objective lens 2 on an intermediate imaging plane.
The detector 4 is equipped with a relay lens 3 that forms an image on the light-receiving surface (area from point A'' to point A'' in the figure).
It is cooled to a temperature of about 80° C. and is surrounded by a cold shield 5 that has an opening for passing the effective light beam from the object and blocks thermal radiation from surrounding objects. The aperture stop 1 of the imaging optical system and the aperture of the cold shield 5 have a conjugate relationship (that is, the exit pupil and the aperture match), and the surface of the aperture stop 1 on the detector 4 side is made of a mirror surface. There is.
このような構成の撮像光学装置において、コールドシー
ルド５開口部の端点Ａから角α内に放射される光（検知
器４受光面点Ａ′〜点Ａ ”からの放射光）はすべて開
口絞り１の開口部端点Ｂで正反射されて点Ａに戻ってく
る。同様にして、コルドシールト５の開口部形成面（受
光面からの高さｈ）からの放射光はすべてコールドシー
ルド５に戻る。即ち、第１図に示された構成をとれば、
冷却された検知器４及びコールドシールド５自体の放射
光が開口絞り１の鏡面で反射されて検知器４及びコール
ドシールド５に入射することになり、周囲の常温物体か
ら検知器に入射する熱輻射が低減される。このため、検
知器４の比検出感度Ｄ″ （Ｄ＊ ＝＝ ＡＩ／２
（Δｆ）”２ ／ （ＮＰＥ）［ｃｍ−Ｈｚ”２−
Ｗ−’コ ：ここにＮＥＰは雑音等価電力−Ｊ−Ａ／
（Ｓ ／Ｎ ） ［ｗ］ 、 Ｊは入射光束の単位面積
当りのエネルギー［Ｗ／ｃｍ２］ 、 Ｓは信号出力電
圧［Ｖ］ 、 Ｎは雑音電圧［Ｖ］、Ａは素子の有効面
積［Ｃｍ２］Δｆは測定する赤外線の帯域幅［Ｈ４Ｆ）
が向上する。In the imaging optical device having such a configuration, all the light emitted within the angle α from the end point A of the aperture of the cold shield 5 (the emitted light from the light-receiving surface points A' to A' of the detector 4) is transmitted through the aperture stop 1. It is specularly reflected at the opening end point B and returns to point A. Similarly, all the emitted light from the opening forming surface (height h from the light receiving surface) of the cold shield 5 returns to the cold shield 5. , if we take the configuration shown in Figure 1,
The emitted light from the cooled detector 4 and cold shield 5 itself is reflected by the mirror surface of the aperture diaphragm 1 and enters the detector 4 and cold shield 5, and thermal radiation from surrounding room-temperature objects enters the detector. is reduced. Therefore, the specific detection sensitivity of the detector 4 D'' (D* == AI/2
(Δf)”2 / (NPE) [cm-Hz”2-
W-'co: Here, NEP is the noise equivalent power -J-A/
(S/N) [w], J is the energy per unit area of the incident light flux [W/cm2], S is the signal output voltage [V], N is the noise voltage [V], and A is the effective area of the element [Cm2]. ]Δf is the bandwidth of the infrared ray to be measured [H4F)
will improve.
また、本実施例では中間結像面に視野絞り６を設けて視
野絞り６の検知器側の面も鏡面で構成しているので、検
知器４の非受光面の端点Ｃ（−！Ａ°°）と視野絞り６
の開口部端点りも共役関係にあり、点Ｃから放射された
光も視野絞り６の鏡面で反射され点Ｃに戻ることになる
。即ち、検知器４非受光面からの放射光も検知器４（非
受光面）に戻ることになるので、冷却効率の向上を図る
ことができる。この際、撮像光学系がテレセントリック
系であれば、検知器４からの放射光がより効率良く開口
絞り１及び視野絞り６の鏡面で反射されることになる。In addition, in this embodiment, the field stop 6 is provided on the intermediate imaging plane, and the surface of the field stop 6 on the detector side is also made of a mirror surface, so the end point C (-!A° °) and field aperture 6
The end points of the aperture are also in a conjugate relationship, and the light emitted from point C is also reflected by the mirror surface of field stop 6 and returns to point C. That is, since the emitted light from the non-light-receiving surface of the detector 4 also returns to the detector 4 (non-light-receiving surface), the cooling efficiency can be improved. At this time, if the imaging optical system is a telecentric system, the emitted light from the detector 4 will be more efficiently reflected by the mirror surfaces of the aperture stop 1 and the field stop 6.
次に第２図は、第１発明の別の実施例を示す光路図であ
る。本実施例の撮像光学装置は、基本的な構成は第１図
に示された実施例と同様であるが、中間結像面に視野絞
りが設けられておらず、開口絞り２１の開口部の大きさ
が可変になっている。かかる撮像光学装置において、開
口絞り２１を図の様に絞った場合、射出瞳の大きさは図
中点Ｅ〜点Ｆで示される大きさとなる。このとき射出瞳
の大きさはコールドシールド５開口部の大きさはより小
さくなるが、角γ及び角γ′内の光束は開口絞り２１の
鏡面で反射されて、同じ光路を通って検知器４受光面の
光軸上の点に戻る。Next, FIG. 2 is an optical path diagram showing another embodiment of the first invention. The basic configuration of the imaging optical device of this embodiment is the same as that of the embodiment shown in FIG. The size is variable. In such an imaging optical device, when the aperture stop 21 is stopped as shown in the figure, the size of the exit pupil becomes the size shown by points E to F in the figure. At this time, the size of the exit pupil is smaller than the size of the aperture of the cold shield 5, but the light beams within angles γ and γ' are reflected by the mirror surface of the aperture stop 21 and pass through the same optical path to the detector 4. Return to the point on the optical axis of the light receiving surface.
また、射出瞳の端点Ｅから角β内に発せられる光束（検
知器の受光面と周辺の非受光部を含む点Ｅ°〜点Ｅ ”
内から発せられた光束）は開口絞り２１の端点Ｂ′で反
射されてそのまま検知器４の点Ｅ′〜点Ｅ ”内に戻っ
てくる。コールドシールド５開口部の端点Ａについても
同様に開口絞り２１の鏡面て反射され、点Ａ°〜点Ａ
”の領域に戻る。Also, the light flux emitted within the angle β from the end point E of the exit pupil (point E° to point E including the light-receiving surface of the detector and the surrounding non-light-receiving area)
The light flux emitted from the inside is reflected at the end point B' of the aperture diaphragm 21 and returns directly to the point E' to point E'' of the detector 4. Similarly, the end point A of the cold shield 5 opening is It is reflected by the mirror surface of the diaphragm 21, and from point A° to point A
” Return to the realm of “.
即ち、第２図に示されたような構成をとれば、開口絞り
２１を絞ることによってコールドシールド５開口部の大
きさより射出瞳が小さくなっても撮像対象以外から検知
器４に入射するのは冷却された検知器４及びコールドシ
ールド５自体からの放射光であるので、実質的にコール
ドシールド５の開口部が絞られたのと等価である。That is, if the configuration shown in FIG. 2 is adopted, even if the exit pupil becomes smaller than the size of the opening of the cold shield 5 by narrowing down the aperture diaphragm 21, no light will enter the detector 4 from other than the object to be imaged. Since the light is emitted from the cooled detector 4 and the cold shield 5 itself, it is substantially equivalent to the opening of the cold shield 5 being narrowed down.
次に、第２の発明の実施例を第３図を用いて説明する。Next, an embodiment of the second invention will be described using FIG. 3.
本゛実施例による撮像光学装置の光学系は対物レンズ３
２と、対物レンズ３２によって中間結像面３２ａに結像
された像を赤外線検知器３４の受光面に結像するリレー
レンズ３３を備えており、検知器３４はリレーレンズ３
３からの有効光束を通過させるための開口部を有すると
ともに周囲の物体からの熱輻射を遮蔽するコールドシー
ルド３５で囲まれて８０に程度の温度に冷却されている
。コールドシールド３５の外側は赤外線を透過する光学
窓部材７ａとこの窓部材の支持部材７ｂで密閉されてお
り、検知器３４は真空中に配置されている。The optical system of the imaging optical device according to this embodiment is an objective lens 3.
2, and a relay lens 33 for forming an image formed on an intermediate image forming surface 32a by an objective lens 32 on a light receiving surface of an infrared detector 34,
It is surrounded by a cold shield 35 which has an aperture for passing the effective light beam from 3 and which blocks thermal radiation from surrounding objects, and is cooled to a temperature of about 80°C. The outside of the cold shield 35 is sealed with an optical window member 7a that transmits infrared rays and a support member 7b for this window member, and the detector 34 is placed in a vacuum.
また、支持部材７ｂの検知器３４側の面は鏡面て構成さ
れており、光学窓部材７ａの端部（支持部材７ｂとの接
続部分）は耐圧性の点からテーバ加工されている。そし
て、光学窓部４４’ ７ ａの検知器３４側の面と撮像
光学系の開口絞り３１か共役な関係（即ち射出瞳と光学
窓部材７ａが合致）となっている。検知器３４とともに
真空中に配置されているコールドシールド３５の開口部
形成面の高さは射出瞳の位置より低くなっており、開口
部口径はリレーレンズ３３からの有効光束の光路を遮ら
ないように射出瞳より大きくなっている。また、本実施
例ではコールドシールド３５の外表面は黒体（反射率−
！零、放射率！１００％）て構成されている。Further, the surface of the support member 7b on the side of the detector 34 is mirror-finished, and the end portion of the optical window member 7a (the connection portion with the support member 7b) is tapered for pressure resistance. The surface of the optical window portion 44' 7a on the detector 34 side and the aperture stop 31 of the imaging optical system are in a conjugate relationship (that is, the exit pupil and the optical window member 7a match). The height of the aperture forming surface of the cold shield 35 placed in a vacuum together with the detector 34 is lower than the exit pupil position, and the aperture diameter is set so as not to block the optical path of the effective light beam from the relay lens 33. is larger than the exit pupil. In addition, in this embodiment, the outer surface of the cold shield 35 is a black body (reflectance -
! Zero, emissivity! 100%).
このような構成の撮像光学装置の光軸を含む断面におい
て、光軸上の受光点Ｇ、射出瞳の端点Ｈコールドシール
ド３５開口部の端点■で規定される角δ内から点Ｇに入
射する熱輻射は、全て冷却器（図示せず）によって冷却
された検知器３４受光部及びコールドシールド３５から
発せられることになる。例えば、コールドシールド３５
の外表面の点Ｊからの放射光は図に示される如く光学窓
部材７ａの鏡面て反射されて検知器３４受光面上の点Ｇ
に入射する。また、受光部の端点Ｋに関しても３点Ｈ，
に、Ｉで規定される角Ｃ内から入射する熱輻射について
同様の状況が成立し、コールドシールド３５からの放射
光が入射することになる。光軸を含まない断面について
も同様である。このため、光学窓部材７ａによって規定
されるＦ値（Ｆ＝ｆ／Ｄ 、ｆは光学系の焦点距離、Ｄ
は入射瞳の直径）と、コールドシールド３５によって規
定されるＦ値が実質的に一致することになる。In a cross section including the optical axis of the imaging optical device having such a configuration, light enters point G from within the angle δ defined by the light receiving point G on the optical axis, the end point H of the exit pupil, and the end point ■ of the cold shield 35 opening. Thermal radiation is emitted from the light receiving portion of the detector 34 and the cold shield 35, which are all cooled by a cooler (not shown). For example, Cold Shield 35
The emitted light from the point J on the outer surface of the optical window member 7a is reflected by the mirror surface of the optical window member 7a, as shown in the figure, and reaches the point G on the light receiving surface of the detector 34.
incident on . Also, regarding the end point K of the light receiving part, there are three points H,
A similar situation holds true for thermal radiation that enters from within the angle C defined by I, and radiation from the cold shield 35 enters. The same applies to a cross section that does not include the optical axis. Therefore, the F value defined by the optical window member 7a (F=f/D, f is the focal length of the optical system, D
(diameter of the entrance pupil) and the F value defined by the cold shield 35 substantially match.
即ち、第３図に示された撮像光学系においては、射出瞳
と合致するように配置された光学窓部材７ａの支持部７
ｂの検知器側の面を鏡面で構成されているので、射出瞳
と開口部とが合致するように配置されたコールドシール
ドの代替としての機能を支持部７ｂの内面（鏡面）が果
たしていることになり、従来に比較してコールドシール
ド３５及び光学窓部材７ａ、支持部材７ｂを小型化する
ことができ、それによって冷却負荷を低減することもで
きる。更に、光学窓部材７ａ及びその支持部材７ｂを小
型化できることは機械的強度（耐圧）の点でも有利であ
る。That is, in the imaging optical system shown in FIG. 3, the support portion 7 of the optical window member 7a is arranged to match the exit pupil.
Since the detector side surface of support part 7b is made of a mirror surface, the inner surface (mirror surface) of support part 7b functions as a substitute for a cold shield arranged so that the exit pupil and the opening match. As a result, the cold shield 35, the optical window member 7a, and the support member 7b can be made smaller than in the past, and the cooling load can thereby be reduced. Furthermore, being able to downsize the optical window member 7a and its support member 7b is advantageous in terms of mechanical strength (pressure resistance).
なお、コールドシールド３５の外表面は冷却されたコー
ルドシールド３５自体の放射光を検知器３４に入射させ
る上では本実施例のように黒体で構成することが好まし
いか、コールドシールド３５外表面の放射率１反射率に
ついては特に限定されるものではない。コールドシール
ド３５外表面が鏡面である場合には、検知器３４の支持
基板８（第３図では基板８はコールドシールド３５内に
配置されているが、支持部材７ａの底部が基板８によっ
て閉止された構造をとることもある）等からの放射光が
コールドシールド３５の外表面及び支持部材７ｂの鏡面
で反射されて検知器３４に入射する。The outer surface of the cold shield 35 is preferably made of a black body as in this embodiment in order to allow the emitted light of the cooled cold shield 35 itself to enter the detector 34, or the outer surface of the cold shield 35 is preferably made of a black body as in this embodiment. There are no particular limitations on the emissivity and reflectance. When the outer surface of the cold shield 35 is a mirror surface, the support substrate 8 of the detector 34 (in FIG. 3, the substrate 8 is placed inside the cold shield 35, but the bottom of the support member 7a is closed by the substrate 8) The emitted light is reflected by the outer surface of the cold shield 35 and the mirror surface of the support member 7b and enters the detector 34.
また、上記の実施例では検知器３４及びコールドシール
ド３５が真空中に配置されているが、不活性ガス等を封
入する場合でも同様に適応できることは言うまでもない
。Further, in the above embodiment, the detector 34 and the cold shield 35 are placed in a vacuum, but it goes without saying that the same can be applied to the case where the detector 34 and the cold shield 35 are filled with inert gas or the like.
更に、第３図に示された実施例ては光学窓部材７ａの内
側（検知器側）の面と射出瞳を合致させたが、外側の面
と射出瞳を合致させ、光学窓部材７ａの外表面の位置に
検知器３４側の面を鏡面で構成した絞りを配置すれば、
この絞りによって第２図で説明した実施例と同様に検知
器の感度を低下させることなく光学系のＦ値を変化させ
ることかできる。Furthermore, in the embodiment shown in FIG. 3, the inner surface (detector side) of the optical window member 7a matches the exit pupil, but the outer surface and the exit pupil match, and the optical window member 7a If a diaphragm with a mirror surface on the side facing the detector 34 is placed on the outer surface,
With this diaphragm, the F value of the optical system can be changed without reducing the sensitivity of the detector, similar to the embodiment described in FIG. 2.
次に、第３の発明の実施例について第４図及び第５図を
用いて説明する。Next, an embodiment of the third invention will be described using FIGS. 4 and 5.
まず、第４図を参照して射出瞳とコールドシールド開口
部を合致させるための条件について説明する。第４図に
示された撮像光学装置の構成は第１図に示した実施例の
構成と基本的に同様である。図において、対物レンズ２
を単レンズとして主点から開口絞り１までの距離をＳ、
対物レンズ２の焦点距離をｆｌ、リレーレンズ３主点か
ら中間結像面までの距離をａ、最終結像面（検知器４受
光面）までの距離をす、リレーレンズ３の焦点距離をｆ
２．コールドシールド５開口部の高さをり、射出瞳位置
（リレーレンズ主点からの距離）をＸ、射出瞳の径をφ
、ｌ５ｆＩ口絞り径をＤとする。First, conditions for matching the exit pupil with the cold shield opening will be explained with reference to FIG. The configuration of the imaging optical device shown in FIG. 4 is basically the same as the configuration of the embodiment shown in FIG. In the figure, objective lens 2
Assuming that is a single lens, the distance from the principal point to the aperture stop 1 is S,
The focal length of the objective lens 2 is fl, the distance from the principal point of the relay lens 3 to the intermediate imaging plane is a, the distance to the final imaging plane (detector 4 light receiving surface) is f, the focal length of the relay lens 3 is f
2. Calculate the height of the cold shield 5 opening, set the exit pupil position (distance from the relay lens principal point) to X, and set the diameter of the exit pupil to φ.
, l5fI aperture diameter is assumed to be D.
そして、入射瞳と共役な位置をＸ”、入射瞳の径をｐｏ
とすると、光軸方向には
１ １ １
ｘ＝ｂ−ｈ
（４）
が成立し、
光軸と直角方向には
Ｄ’＝Ｄｘ’／５
（５）
φ−Ｄ
Ｘ／（ｆｌ
）
（６）
が成立する。Then, the position conjugate to the entrance pupil is X'', and the diameter of the entrance pupil is po.
Then, 1 1 1 x=b-h (4) holds in the optical axis direction, and D'=Dx'/5 (5) φ-DX/(fl) (6 ) holds true.
（１）
〜（４）
を解く
と
ｓ−ｆ、＋［（ｂ
ｆ２） （ｈ
（ｂ
ｆ２Ｎ／（ｈｆ２”）］ｆ＋’
（７）
更に（５）
（６）を解くと、
ｆｌ１Ｏ−（ｈ／φ） Ｘ ｆ２／ｂ−ｆ２−（ｈ−
φ） ｘ （ａ／ｂ） （８）従って、リレーレ
ンズ３が固定で、対物レンズ２を交換することによって
画角を変える場合、（７）式で決定される位置に開口絞
り１を置くと同時に、（８）式で決定される開口の大き
さを設定すれば（即ち、一定のＦ値を設定すれば）、常
に射出瞳とコールドシールド５開口部が合致することに
なる。Solving (1) to (4) gives s−f, +[(b f2) (h (b f2N/(hf2”))]f+' (7) Furthermore, solving (5) and (6), fl1O−( h/φ) X f2/b-f2-(h-
φ) x (a/b) (8) Therefore, when the relay lens 3 is fixed and the angle of view is changed by replacing the objective lens 2, if the aperture stop 1 is placed at the position determined by equation (7), then At the same time, if the aperture size determined by equation (8) is set (that is, if a constant F value is set), the exit pupil and the cold shield 5 aperture always match.
第５図は、第４図の撮像光学装置において対物０ レンズの焦点距離を変えた場合を示す光路図である。FIG. 5 shows the objective 0 in the imaging optical device of FIG. FIG. 4 is an optical path diagram showing a case where the focal length of a lens is changed.
このとき、
開口絞り
１の中間結像面からの距
＠Ｉ１．は
角−ｓ’＋ｆ、°−［（ｂ−ｔ２） （ｈ（ｂ
ｆ２））／（ｈｆ２”）］Ｌ’＋２ｆ＋（９）
となり、
（９）
式を、
ｆｌをｔと書きなおし、
Ｆ （ｔ）
と
すると、
Ｆ （ｔ）−ｐｔ２＋２ｔ−ｐ （ｔ＋１／ｐ） ２１
／ｐ
（１０）
但し、
ｐ・（ｂ−ｆ２）（ｈ−（ｂ
ｆ２） ）／ （ｈｆ２）
となる。At this time, the distance from the intermediate imaging plane of the aperture stop 1 @I1. becomes the angle -s'+f, °-[(b-t2) (h(b f2))/(hf2'')]L'+2f+(9), and in equation (9), rewriting fl as t, F (t), then F (t)-pt2+2t-p (t+1/p) 21
/p (10) However, p・(b-f2)(h-(b f2) )/(hf2).
従って、
対物レンズの倍率を変えた場合の開口
絞り５
１の移動量を対物レンズ５
２の焦点距離に
比例した値とするための条件は
ｐ ” （ｔ）−ｏ 、 即ち、ｐ＝Ｑを解いて、ｈ
＝ｂ ｆ２ （Ｓ＝ｆ＋ ＞
（１１）となる。Therefore, the condition for making the amount of movement of the aperture stop 51 proportional to the focal length of the objective lens 52 when the magnification of the objective lens is changed is p''(t)-o, that is, p=Q. Solve, h
=b f2 (S=f+ >
(11).
即ち、開口絞り５１の位置を対物レンズ５２の前側焦点
位置に一致させ対物レンズ５２を射出側テレセントリッ
クとすれば射出瞳をコールドシールド５の開口部に合致
させることができる。That is, by aligning the position of the aperture stop 51 with the front focal position of the objective lens 52 and making the objective lens 52 telecentric on the exit side, the exit pupil can be aligned with the opening of the cold shield 5.
また、対物レンズの倍率を２段階に変倍（１＝ｆ３．ｆ
４）する場合には、
ｆ３”ｆ４ １
を満たせば、Ｆ（ｆ３）・Ｆ （ｆ、＋）−２ｆ３ｆ４
／（ｆ３’Ｌ）が成立し、変倍しても射出瞳位置が等し
くなる。In addition, the magnification of the objective lens can be changed in two stages (1=f3.f
4) If f3”f4 1 is satisfied, then F(f3)・F (f, +)−2f3f4
/(f3'L) holds true, and the exit pupil position remains the same even if the magnification is changed.
ｆ３＋ｆ４
＝ｆ’
と置き、
（１２）式をｈについて解く
ｈ−（ｂ−ｆ２）２／（（ｂ−ｆ２）＋ｆ２’／ｆ（１
３）
となる。Set f3+f4 = f' and solve equation (12) for h as h-(b-f2)2/((b-f2)+f2'/f(1
3) It becomes.
即ち、コールドシールド５開口部をこの位置に配せば、
２段階に変倍する場合に入射瞳の大きさを変えるたけて
射出瞳とコールドシールド開口部を合致させることがで
きる。That is, if the opening of the cold shield 5 is placed at this position,
When changing the magnification in two steps, the exit pupil and the cold shield opening can be matched by changing the size of the entrance pupil.
更に、この条件は、対物レンズの焦点距離をｆ３〜ｆ４
に連続的に変えた場合の、開口絞り位置Ｆ （ｔ）の変
化量が最少の場合でもある。また、２段階変倍時に対物
レンズ主点からの入射瞳位置を等しくする場合もＦ （
ｔ）＝ｐｔ２＋ｔに関して同様に考えれば良い。Furthermore, this condition sets the focal length of the objective lens to f3 to f4.
This is also the case in which the amount of change in the aperture stop position F (t) is the smallest when the aperture stop position F (t) is continuously changed. Also, when the entrance pupil position from the objective lens principal point is made equal during two-step magnification change, F (
t)=pt2+t can be considered in the same way.
なお、上記の説明では射出瞳とコールドシールド開口部
を合致させることについて述べたが、上述した条件は第
２の発明において射出瞳と光学窓部材を合致させる場合
にも適応されることは言うまでもない。また、上記の説
明ては対物レンズを単レンズとしたが２段レンズ、３段
レンズ等多段３
レンズについても同様に開口整合のための解が存在する
。Note that although the above explanation has been about matching the exit pupil with the cold shield opening, it goes without saying that the above-mentioned conditions also apply when matching the exit pupil with the optical window member in the second invention. . Further, in the above explanation, the objective lens is a single lens, but solutions for aperture matching also exist for multi-stage three lenses such as a two-stage lens and a three-stage lens.
更に、第４図に示された構成の撮像光学装置において第
６図に示されるように中間結像面に焦点鏡９を挿入する
場合、焦点鏡９のマスク部分１０を鏡面で構成すれば、
ナルシサス現象を利用して（マスク部分１０の鏡面で検
知器からの放射光が反射され検知器に戻る）焦点鏡を得
ることができる。また、鏡面（マスク部分１０）以外で
の反射光が検知器に入射することが問題となる場合には
、第７図のようにくさび型の部材を２枚貼りあわせて平
行平面板１１とし、貼り合せ面に焦点鏡９を形成して焦
点鏡９が中間結像面に位置するように平行平面板１１を
光軸ＡＸｋ：対して傾けて挿入すればよい。このように
すれば、マスク１０以外ての反射光が検知器に入射する
のを回避できる。Furthermore, when the focusing mirror 9 is inserted into the intermediate imaging plane as shown in FIG. 6 in the imaging optical device having the configuration shown in FIG. 4, if the mask portion 10 of the focusing mirror 9 is configured with a mirror surface,
A focusing mirror can be obtained using the Narcissus phenomenon (emitted light from the detector is reflected by the mirror surface of the mask portion 10 and returned to the detector). In addition, if it is a problem that light reflected from surfaces other than the mirror surface (mask portion 10) enters the detector, two wedge-shaped members are pasted together to form a parallel plane plate 11 as shown in FIG. A focusing mirror 9 may be formed on the bonding surface, and the plane-parallel plate 11 may be inserted at an angle with respect to the optical axis AXk so that the focusing mirror 9 is located on the intermediate image plane. In this way, reflected light other than from the mask 10 can be prevented from entering the detector.
また、第８図に示された様に平行平面板１２を光軸ＡＸ
に対して傾けて挿入し、平行平面板１２を光軸を回転軸
として回転させれば等価的に検知 ４
器の画素の数あるいは一画素の大きさを増すことができ
るが、平行平面板１２を中間結像面２ａの位置に配置す
ることによって光学系の収差を最少とすることができる
。In addition, as shown in FIG. 8, the parallel plane plate 12 is aligned with the optical axis AX.
The number of pixels or the size of one pixel can be equivalently increased by inserting the parallel plane plate 12 at an angle to the plane and rotating the plane parallel plate 12 around the optical axis. By arranging the lens at the intermediate imaging plane 2a, the aberration of the optical system can be minimized.
［発明の効果コ
以上のように、第１の発明においては射出瞳ととコール
ドシールド開口部が合致し、かつ開口絞りの像側が鏡面
で構成されているので、ナルシサス現象を利用して等価
的にコールドシールド開口部の大きさを変えることが可
能となる。このため、開口絞りを絞って光学系のＦ値を
大きくさせるとともに、コールドシールドによって規定
されるＦ値と光学系のＦ値と合致させて、検知器の感度
（Ｄ＊）を高めることができる。[Effects of the Invention] As described above, in the first invention, the exit pupil and the cold shield aperture match, and the image side of the aperture stop is configured with a mirror surface. It becomes possible to change the size of the cold shield opening. Therefore, the sensitivity (D*) of the detector can be increased by narrowing down the aperture diaphragm to increase the F-number of the optical system and by matching the F-number defined by the cold shield with the F-number of the optical system. .
また、第２の発明においては射出瞳と光学窓部材が合致
し、かつ光学窓部材の支持部が鏡面で構成されているの
で、検知器の感度を低下させることなく検知器の周囲に
配置される光学窓部材及びその支持部材とコールドシー
ルドの大きさを従来に比較して小型化することができる
。In addition, in the second invention, the exit pupil and the optical window member match, and the support portion of the optical window member is made of a mirror surface, so that it can be placed around the detector without reducing the sensitivity of the detector. The size of the optical window member, its support member, and cold shield can be reduced in size compared to conventional ones.
更に、第３の発明においては対物レンズの倍率が変わる
場合にも常に射出瞳とコールドシールド開口部が合致す
るので、冷却効率及び検出感度を維持しなから画角を変
えることができる。Furthermore, in the third invention, even when the magnification of the objective lens changes, the exit pupil and the cold shield aperture always match, so the angle of view can be changed without maintaining cooling efficiency and detection sensitivity.
第１図は第１発明の詳細な説明するための光路図、第２
図は第１発明の別の実施例を説明するための光路図、第
３図は第２発明の詳細な説明するための光路図、第４図
及び第５図は第３発明を説明するための光路図、第６図
及び第７図は焦点鏡の挿入側説明する光路図、第８図は
平行平面板の挿入例を説明する光路図、第９図は従来例
を説明するための光路図である。
［主要部分の符号の説明］
１．２１．３１・・・開口絞り
２．３２・・・・・・・・・・・・対物レンズ３３３・
・・・・・・・・・・・リレーレンズ４．３４・・・・
・・・・・・・・検知器５．３５・・・・・・・・・・
・・コールドシールド６・・・・・・・・・・・・・・
・・・・・・・視野絞り７FIG. 1 is an optical path diagram for detailed explanation of the first invention, and FIG.
The figure is an optical path diagram for explaining another embodiment of the first invention, FIG. 3 is an optical path diagram for explaining the second invention in detail, and FIGS. 4 and 5 are for explaining the third invention. , FIG. 6 and FIG. 7 are optical path diagrams explaining the insertion side of the focusing mirror, FIG. 8 is an optical path diagram explaining an example of inserting a parallel plane plate, and FIG. 9 is an optical path diagram explaining a conventional example. It is a diagram. [Explanation of symbols of main parts] 1.21.31... Aperture diaphragm 2.32... Objective lens 333.
・・・・・・・・・Relay lens 4.34・・・・
・・・・・・・・・Detector 5.35・・・・・・・・・
・・Cold Shield 6・・・・・・・・・・・・・・・
・・・・・・Field aperture 7
Claims (5)
、該撮像光学系の最終結像面の位置に受光面が一致する
ように配置された赤外線検知器と、前記撮像光学系から
の光束が通過する開口部を有して前記検知器を囲むよう
に配置され、前記検知器周囲からの熱輻射を遮蔽するコ
ールドシールドとを備えた赤外線撮像装置において、 前記コールドシールドの開口部が前記撮像光学系の射出
瞳あるいは射出瞳と共役な位置に合致するとともに、前
記撮像光学系の開口絞りの像側の面が鏡面で構成された
ことを特徴とする赤外線撮像光学装置。(1) An imaging optical system having an objective lens and a relay lens, an infrared detector arranged so that its light-receiving surface coincides with the position of the final imaging plane of the imaging optical system, and a light beam from the imaging optical system. In an infrared imaging device, the infrared imaging device includes a cold shield that is arranged to surround the detector and has an opening through which it passes, and that blocks thermal radiation from around the detector, wherein the opening of the cold shield is arranged so as to surround the detector, and the opening of the cold shield is arranged so as to surround the detector, and the cold shield has an opening that allows the imaging optics to pass through the cold shield. An infrared imaging optical device, characterized in that the image-side surface of the aperture stop of the imaging optical system is formed of a mirror surface, which coincides with an exit pupil of the system or a position conjugate with the exit pupil.
に配置された視野絞りを有し、かつ該視野絞りの像側の
面が鏡面で構成されたことを特徴とする請求項１記載の
赤外線撮像光学装置。(2) A field stop disposed on an intermediate image forming plane on which an image by the objective lens is formed, and an image-side surface of the field stop is formed of a mirror surface. The infrared imaging optical device described.
、該撮像光学系の最終結像面の位置に受光面が一致する
ように配置された赤外線検知器と、該検知器の周囲を密
閉する光学窓部材と、該光学窓部材を支持する支持部材
を有する赤外線撮像光学装置において、 前記光学窓部材が前記撮像光学系の射出瞳あるいは射出
瞳と共役な位置に合致するとともに、前記支持部材の検
知器側の面が鏡面で構成されたことを特徴とする赤外線
撮像光学装置。(3) An imaging optical system having an objective lens and a relay lens, an infrared detector arranged so that its light-receiving surface coincides with the position of the final imaging plane of the imaging optical system, and the area around the detector sealed. In an infrared imaging optical device having an optical window member and a support member that supports the optical window member, the optical window member matches the exit pupil of the imaging optical system or a position conjugate with the exit pupil, and the support member An infrared imaging optical device characterized in that a surface on the detector side is configured with a mirror surface.
、該撮像光学系の最終結像面の位置に受光面が一致する
ように配置された赤外線検知器と、前記撮像光学系から
の光束が通過する開口部を有して前記検知器を囲むよう
に配置され、前記検知器周囲からの熱輻射を遮蔽するコ
ールドシールドとを備えた赤外線撮像光学装置において
、 前記撮像光学系が、前記対物レンズを変倍した場合にあ
っても、射出瞳あるいは射出瞳と共役な位置が常に前記
コールドシールドの開口部に合致する変倍光学系である
ことを特徴とする赤外線撮像光学装置。(4) an imaging optical system having an objective lens and a relay lens; an infrared detector arranged so that its light receiving surface coincides with the position of the final image forming surface of the imaging optical system; and a light beam from the imaging optical system. In the infrared imaging optical device, the imaging optical system includes a cold shield that is arranged to surround the detector and has an opening through which it passes, and that blocks thermal radiation from around the detector, wherein the imaging optical system is configured to 1. An infrared imaging optical device characterized by having a variable magnification optical system in which an exit pupil or a position conjugate to the exit pupil always matches the opening of the cold shield even when the magnification of the infrared imaging optical system is changed.
特徴とする請求項４記載の赤外線撮像光学装置。(5) The infrared imaging optical device according to claim 4, wherein the objective lens is telecentric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1175691A JP2691226B2 (en) | 1989-07-10 | 1989-07-10 | Infrared imaging optics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1175691A JP2691226B2 (en) | 1989-07-10 | 1989-07-10 | Infrared imaging optics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0341328A true JPH0341328A (en) | 1991-02-21 |
| JP2691226B2 JP2691226B2 (en) | 1997-12-17 |
Family
ID=16000557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1175691A Expired - Fee Related JP2691226B2 (en) | 1989-07-10 | 1989-07-10 | Infrared imaging optics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2691226B2 (en) |
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Also Published As
| Publication number | Publication date |
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| JP2691226B2 (en) | 1997-12-17 |
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