JP2010113191A - Infrared optical system - Google Patents

Infrared optical system Download PDF

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JP2010113191A
JP2010113191A JP2008286272A JP2008286272A JP2010113191A JP 2010113191 A JP2010113191 A JP 2010113191A JP 2008286272 A JP2008286272 A JP 2008286272A JP 2008286272 A JP2008286272 A JP 2008286272A JP 2010113191 A JP2010113191 A JP 2010113191A
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lens
infrared
object side
optical system
optical element
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Koji Tsubaki
浩二 椿
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Topcon Corp
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Topcon Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an infrared optical system that provides a favorable image and is suitable for a monitoring camera arranged under a severe environment, and to provide an infrared lens for sufficiently removing remaining chromatic aberration in an infrared region. <P>SOLUTION: The infrared optical system is used in a wavelength region of 3-14 &mu;m from infrared to far infrared. The infrared optical system includes two lenses, a first convex meniscus lens whose convex surface faces the object side and a second concave meniscus lens whose concave surface faces the object side, in this order from the object side. Both surfaces of at least one of the first lens and second lens are used as diffraction optical element surface. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、３μｍから１４μｍまでの赤外線から遠赤外線までの波長域で用いられる赤外線光学系に関し、例えば監視カメラ、赤外線カメラ、車載カメラ、携帯電話付きカメラなどに用いられる光学系に関する。   The present invention relates to an infrared optical system used in a wavelength range from 3 μm to 14 μm from infrared to far infrared, and relates to an optical system used for, for example, a surveillance camera, an infrared camera, an in-vehicle camera, and a camera with a mobile phone.

従来から、例えば特許文献１の請求項１に示すように、撮像素子の撮像面上に光学像を形成するための単焦点撮像レンズであって、物体側からこの順で配列された第１レンズ及び第２レンズを備え、第１レンズ及び第２レンズのうち少なくとも一方は正の光学的パワーを有するガラスレンズであり、且つ第１レンズ及び第２レンズを構成するレンズ面のうち少なくとも一つは回折面に構成されている単焦点撮像レンズが開示されている。同文献第７頁の段落番号００２９に示すように、回折面を２面以上導入してもよい旨が記載されている。更に、第１レンズの第２レンズ面、第２レンズの第１レンズ面にそれぞれ回折光学素子面を配置したレンズ系が開示されている。   2. Description of the Related Art Conventionally, for example, as shown in claim 1 of Patent Document 1, a single-focus imaging lens for forming an optical image on an imaging surface of an imaging device, which is a first lens arranged in this order from the object side And at least one of the first lens and the second lens is a glass lens having positive optical power, and at least one of the lens surfaces constituting the first lens and the second lens. A single focus imaging lens configured on a diffractive surface is disclosed. As indicated by paragraph number 0029 on page 7 of the document, it is described that two or more diffractive surfaces may be introduced. Furthermore, a lens system is disclosed in which diffractive optical element surfaces are arranged on the second lens surface of the first lens and the first lens surface of the second lens, respectively.

また、例えば特許文献２の公報第５頁段落番号００２０、図１に記載されているように、硫化亜鉛（ＺｎＳ）で形成された第１レンズの第２レンズ面に回折光学素子を配置した３群３枚の赤外線レンズが開示されている。   Further, as described in, for example, Patent Document 2, page 5, paragraph number 0020, FIG. 1, a diffractive optical element is arranged on the second lens surface of the first lens formed of zinc sulfide (ZnS) 3. A group of three infrared lenses are disclosed.

また、例えば特許文献３では、硫化亜鉛（ＺｎＳ）をレンズ材料とし光学系を構成して、第１レンズの凹面側に回折光学素子を使用して色収差を補正している。
特開２００７−３３３８８３号公報 特開２００７−２４１０３２号公報 特開２００３−２９５０５２号公報 For example, in Patent Document 3, an optical system is configured using zinc sulfide (ZnS) as a lens material, and chromatic aberration is corrected by using a diffractive optical element on the concave surface side of the first lens.
JP 2007-333883 A JP 2007-244102 A JP 2003-295052 A

しかしながら、上述の特許文献１に記載の単焦点撮像レンズでは、回折光学素子面を２面以上配置するとはいえ、第１レンズの第２レンズ面、第２レンズの第１レンズ面にそれぞれ回折光学素子面が配置されているだけで、同一レンズの第１レンズ面、第２レンズ面に配置されておらず、単に一つのレンズの一レンズ面に回折光学素子を配置しただけでは、十分な色収差補正をすることができず、３μｍから１４μｍまでの赤外線から遠赤外線までの波長域に適した監視カメラなどの特殊なカメラに用いることができない。   However, in the above-described single-focus imaging lens described in Patent Document 1, although two or more diffractive optical element surfaces are arranged, diffractive optics are respectively provided on the second lens surface of the first lens and the first lens surface of the second lens. Only the element surfaces are arranged, not on the first lens surface and the second lens surface of the same lens, and it is sufficient to simply arrange the diffractive optical element on one lens surface of one lens. It cannot be corrected, and cannot be used for a special camera such as a surveillance camera suitable for a wavelength range from 3 μm to 14 μm of infrared rays to far infrared rays.

また、特許文献２では、回折光学素子を使用した光学系とはいえ、２枚構成では視野角を広げたり、フランジバックを長くしたりすることはできないことから、３枚構成になっている。   Further, in Patent Document 2, although it is an optical system using a diffractive optical element, the two-lens configuration has a three-lens configuration because the viewing angle cannot be increased and the flange back cannot be lengthened.

また、特許文献３のような従来の赤外光学系の設計では、屈折率の高く高価なＧｅまたはＺｎＳｅ、ＺｎＳのような材料を主に使用するが、色収差を補正するには、これらの材料を複数組み合わせて使用することが必要であった。   Moreover, in the design of the conventional infrared optical system as in Patent Document 3, a material such as Ge or ZnSe or ZnS having a high refractive index is mainly used, but these materials are used for correcting chromatic aberration. It was necessary to use multiple combinations.

そこで、本発明では、良好な画像を得ることができ、過酷な環境下に配置される監視カメラなどに適した赤外線光学系を提供することを目的とする。   Therefore, an object of the present invention is to provide an infrared optical system that can obtain a good image and is suitable for a surveillance camera or the like disposed in a harsh environment.

本発明の他の目的は、製造及び処理が容易なモールド成型が可能で安価に入手できる材料例えばカルコゲナイドガラスのみを使用し、赤外領域において在留色収差を十分に除去することのできる赤外線レンズを提供することである。   Another object of the present invention is to provide an infrared lens capable of sufficiently removing the chromatic aberration in the infrared region by using only a material that can be easily molded and processed and can be obtained at low cost, for example, chalcogenide glass. It is to be.

上記課題を解決するための本発明の解決手段を例示すると、特許請求の範囲の各請求項に記載のとおりである。   Examples of the solving means of the present invention for solving the above-described problems are as described in the claims.

とくに、本発明に係る赤外線光学系は、３μｍから１４μｍまでの赤外線から遠赤外線までの波長域で用いられ、物体側より順に、物体側に凸面を向けた凸メニスカスの第１レンズと、物体側に凹面を向けた凸メニスカスの第２レンズの２枚のレンズで構成され、第１レンズと第２レンズの少なくとも一方の両面を回折光学素子面としたことを特徴とする。   In particular, the infrared optical system according to the present invention is used in a wavelength region from infrared to far infrared from 3 μm to 14 μm, and in order from the object side, a first lens of a convex meniscus having a convex surface facing the object side, and an object side The second lens is composed of a convex meniscus second lens having a concave surface on the surface, and at least one of both surfaces of the first lens and the second lens is a diffractive optical element surface.

好ましくは、第１レンズと第２レンズが、いずれもカルコゲナイドレンズ材料で形成されている。   Preferably, both the first lens and the second lens are made of a chalcogenide lens material.

好ましくは、第１レンズと第２レンズが、同じ赤外透過材料で形成されている。   Preferably, the first lens and the second lens are formed of the same infrared transmitting material.

好ましくは、以下の条件式（１）を満たす：
１．２ ＜ ｆ１／ｆ ＜ ２．０・・・条件式（１）
但し、
ｆ：全系の焦点距離、
ｆ１：対物レンズの焦点距離。 Preferably, the following conditional expression (1) is satisfied:
1.2 <f1 / f <2.0 Conditional expression (1)
However,
f: focal length of the entire system,
f1: Focal length of the objective lens.

良好な画像を得ることができ、過酷な環境下に配置される監視カメラなどに適した赤外線光学系を提供することができる。   A good image can be obtained, and an infrared optical system suitable for a surveillance camera or the like placed in a harsh environment can be provided.

本発明は、赤外線光学系のレンズ系の構成を改良したものである。   The present invention is an improvement in the configuration of a lens system of an infrared optical system.

本発明の１つの実施形態によれば、物体側より順に、物体側に凸面を向けた凸メニスカスの第１レンズと、物体側に凹面を向けた凸メニスカスの第２レンズの最小枚数２群２枚で構成する。更に、第１レンズと第２レンズの少なくとも一方の両面を回折光学素子面とする。   According to one embodiment of the present invention, in order from the object side, a minimum number of two groups 2 of a first lens having a convex meniscus having a convex surface facing the object side and a second lens having a convex meniscus having a concave surface facing the object side. Consists of sheets. Furthermore, at least one of both surfaces of the first lens and the second lens is a diffractive optical element surface.

本発明の別の実施形態によれば、第１レンズと第２レンズが、いずれもカルコゲナイドレンズ材料で形成されている。   According to another embodiment of the present invention, both the first lens and the second lens are made of a chalcogenide lens material.

本発明の更に別の実施形態によれば、第１レンズと第２レンズが、同じ赤外透過材料で形成されている
本発明の更に別の実施形態によれば、以下の条件式（１）が満たされている：
１．２ ＜ ｆ１／ｆ ＜ ２．０・・・条件式（１）、
但し、
ｆ：全系の焦点距離、
ｆ１：対物レンズの焦点距離。 According to still another embodiment of the present invention, the first lens and the second lens are formed of the same infrared transmitting material. According to still another embodiment of the present invention, the following conditional expression (1) Is satisfied:
1.2 <f1 / f <2.0 Conditional expression (1),
However,
f: focal length of the entire system,
f1: Focal length of the objective lens.

一般的に使用されるゲルマニウムは、希少金属の結晶材で非常に高価であり、研磨や切削にて形状を加工しているのが現状である。カルコゲナイドガラスは、ゲルマニウム、アンチモン、セレン等を主成分とするガラスで、結晶材に比較して安価であり、モールド成型が可能であるガラス材である。   Generally used germanium is a rare metal crystal material, which is very expensive, and is currently processed in shape by polishing or cutting. Chalcogenide glass is a glass material mainly composed of germanium, antimony, selenium, etc., and is cheaper than a crystal material and can be molded.

また、条件式（１）を満足することにより、視野内の諸収差がバランスよく補正され、かつコンパクトで明るい構成にし易くなる。   Further, by satisfying conditional expression (1), various aberrations in the field of view can be corrected in a balanced manner, and a compact and bright configuration can be easily obtained.

また、第２レンズに回折面（回折光学素子面）を設けることにより、倍率色収差およびコマ収差、非点収差を補正することが可能となり、広角視野内での諸収差がバランス良く補正でき、フランジバックを長くすることが可能になる。   Further, by providing the second lens with a diffractive surface (a diffractive optical element surface), it becomes possible to correct lateral chromatic aberration, coma aberration, and astigmatism, and to correct various aberrations in a wide-angle visual field in a balanced manner. It is possible to lengthen the back.

また、第２レンズに回折光学素子を使用することにより、Ｆ値１．０でかつ片側視野角１４°以上、ＦＢ／ｆ０．６以上を確保することが可能である。   Further, by using a diffractive optical element for the second lens, it is possible to ensure an F value of 1.0, a one-side viewing angle of 14 ° or more, and FB / f of 0.6 or more.

図１は、実施例１の光路図である。図２は、実施例１の収差図である。   FIG. 1 is an optical path diagram of the first embodiment. FIG. 2 is an aberration diagram of Example 1. FIG.

本実施例１において、回折光学素子面（回折面）は、光路差関数Ψ（ｈ）の係数がつけられた第２レンズＬ２の第２面である。また、第１レンズＬ１の第２面、第２レンズＬ２の第１面は非球面である。   In Example 1, the diffractive optical element surface (diffractive surface) is the second surface of the second lens L2 to which the coefficient of the optical path difference function Ψ (h) is attached. The second surface of the first lens L1 and the first surface of the second lens L2 are aspheric.

実施例１の赤外線光学系１のレンズ系の構成は、下記のとおりである。   The configuration of the lens system of the infrared optical system 1 of Example 1 is as follows.

物体側Ｐより順に、物体側Ｐに凸面（Ｓ１）を向けた凸メニスカスの第１レンズＬ１と、物体側Ｐに凹面（Ｓ３）を向けた凸メニスカスの第２レンズＬ２の最小枚数２群２枚で構成する。   In order from the object side P, a minimum number 2 group 2 of a convex meniscus first lens L1 having a convex surface (S1) facing the object side P and a convex meniscus second lens L2 having a concave surface (S3) facing the object side P. Consists of sheets.

第１レンズＬ１と第２レンズＬ２は、いずれもカルコゲナイドレンズ材料で形成されている。   The first lens L1 and the second lens L2 are both made of a chalcogenide lens material.

ｆ＝１８．２２ｍｍ、口径比Ｆ／１．０、画角２ω＝２８°
ｆ１＝２５．００ｍｍ
１＜ｆ１／ｆ＝１．３７
０．５＜ＦＢ／ｆ＝０．７１

Figure 2010113191
Figure 2010113191
Figure 2010113191
 f = 18.22 mm, aperture ratio F / 1.0, angle of view 2ω = 28 °
f1 = 25.00mm
1 <f1 / f = 1.37
0.5 <FB / f = 0.71
Figure 2010113191
Figure 2010113191
Figure 2010113191

非球面係数
面番号Ｓ２

Figure 2010113191
Aspheric coefficient surface number S2
Figure 2010113191

面番号Ｓ３

Figure 2010113191
Surface number S3
Figure 2010113191

面番号Ｓ４

Figure 2010113191
Figure 2010113191
Figure 2010113191
 Surface number S4
Figure 2010113191
Figure 2010113191
Figure 2010113191

面番号Ｓ４

Figure 2010113191
Surface number S4
Figure 2010113191

なお、回折光学素子面（回折面）は、第２レンズＬ２の第２面に限定されず、その第２レンズＬ２の第１面に設けてもよい。すなわち、そのレンズの一方の面に回折光学素子面を設けた場合に、その裏面に回折光学素子面を設置しても、光学特性は変わらず、良好な画像を得ることができ、過酷な環境にも耐えうる耐久性を備えている。 The diffractive optical element surface (diffractive surface) is not limited to the second surface of the second lens L2, and may be provided on the first surface of the second lens L2. In other words, when a diffractive optical element surface is provided on one surface of the lens, even if a diffractive optical element surface is provided on the rear surface, the optical characteristics do not change, and a good image can be obtained, which is a harsh environment. Durable enough to withstand.

図３は、実施例２の光路図である。図４は、実施例２の収差図である。   FIG. 3 is an optical path diagram of the second embodiment. FIG. 4 is an aberration diagram of Example 2.

本実施例２において、回折光学素子面（回折面）は、光路差関数Ψ（ｈ）の係数がつけられた第４面、すなわち第２レンズＬ２の第２面である。また、第１レンズＬ１の第２面、第２レンズＬ２の第１面および第２レンズＬ２の第２面は非球面である。   In Example 2, the diffractive optical element surface (diffractive surface) is the fourth surface to which the coefficient of the optical path difference function Ψ (h) is attached, that is, the second surface of the second lens L2. The second surface of the first lens L1, the first surface of the second lens L2, and the second surface of the second lens L2 are aspheric.

実施例２の赤外線光学系１１のレンズ系の構成は、下記のとおりである。   The configuration of the lens system of the infrared optical system 11 of Example 2 is as follows.

物体側Ｐより順に、物体側Ｐに凸面（Ｓ１１）を向けた凸メニスカスの第１レンズＬ１１と、物体側Ｐに凹面（Ｓ１３）を向けた凸メニスカスの第２レンズＬ１２の最小枚数２群２枚で構成する。   In order from the object side P, the first lens L11 having a convex meniscus having a convex surface (S11) facing the object side P and the second lens group 2 of the second lens L12 having a convex meniscus having a concave surface (S13) facing the object side P Consists of sheets.

第１レンズＬ１１と第２レンズＬ１２は、いずれもカルコゲナイドレンズ材料で形成されている。   Both the first lens L11 and the second lens L12 are made of a chalcogenide lens material.

ｆ＝１８．２２ｍｍ、口径比Ｆ／１．０、画角２ω＝２８°
ｆ１＝１８．００ｍｍ
１＜ｆ１／ｆ＝０．９９

Figure 2010113191
Figure 2010113191
Figure 2010113191
 f = 18.22 mm, aperture ratio F / 1.0, angle of view 2ω = 28 °
f1 = 18.00mm
1 <f1 / f = 0.99
Figure 2010113191
Figure 2010113191
Figure 2010113191

非球面係数
面番号Ｓ１２

Figure 2010113191
Aspheric coefficient surface number S12
Figure 2010113191

面番号Ｓ１３

Figure 2010113191
Surface number S13
Figure 2010113191

面番号Ｓ１４

Figure 2010113191
Figure 2010113191
Figure 2010113191
 Surface number S14
Figure 2010113191
Figure 2010113191
Figure 2010113191

面番号Ｓ１４

Figure 2010113191
Surface number S14
Figure 2010113191

なお、回折光学素子面（回折面）は、第２レンズＬ２の第２面に限定されず、その第２レンズＬ２の第１面に設けてもよい。すなわち、そのレンズの一方の面に回折光学素子面を設けた場合に、その裏面にも回折光学素子面を設置しても、光学特性は変わらず、良好な画像を得ることができ、過酷な環境にも耐えうる耐久性を備えている。 The diffractive optical element surface (diffractive surface) is not limited to the second surface of the second lens L2, and may be provided on the first surface of the second lens L2. That is, when a diffractive optical element surface is provided on one surface of the lens, even if a diffractive optical element surface is provided on the rear surface, the optical characteristics are not changed, and a good image can be obtained. Durable enough to withstand the environment.

図５は、実施例３の光路図である。図６は、実施例３の収差図である。   FIG. 5 is an optical path diagram of the third embodiment. FIG. 6 is an aberration diagram of Example 3.

本実施例３において、回折光学素子面（回折面）は、光路差関数Ψ（ｈ）の係数がつけられた第２レンズＬ２の第１面である。また、第１レンズＬ１の第２面、第２レンズＬ２の第１面および第２レンズＬ２の第２面は非球面である。   In Example 3, the diffractive optical element surface (diffractive surface) is the first surface of the second lens L2 to which the coefficient of the optical path difference function Ψ (h) is attached. The second surface of the first lens L1, the first surface of the second lens L2, and the second surface of the second lens L2 are aspheric.

実施例３の赤外線光学系２１のレンズ系の構成は、下記のとおりである。   The configuration of the lens system of the infrared optical system 21 of Example 3 is as follows.

物体側Ｐより順に、物体側Ｐに凸面（Ｓ２１）を向けた凸メニスカスの第１レンズＬ２１と、物体側Ｐに凹面（Ｓ２３）を向けた凸メニスカスの第２レンズＬ２２の最小枚数２群２枚で構成する。   In order from the object side P, the first lens L21 having a convex meniscus having a convex surface (S21) facing the object side P and the second lens group 2 of the minimum number of convex meniscus second lenses L22 having a concave surface (S23) facing the object side P Consists of sheets.

第１レンズＬ２１と第２レンズＬ２２は、いずれもカルコゲナイドレンズ材料で形成されている。   The first lens L21 and the second lens L22 are both made of a chalcogenide lens material.

ｆ＝１８．２２ｍｍ、口径比Ｆ／１．０、画角２ω＝２８°
ｆ１＝２７．２５ｍｍ
１＜ｆ１／ｆ＝１．５０
０．５＜ＦＢ／ｆ＝０．７２

Figure 2010113191
Figure 2010113191
Figure 2010113191
 f = 18.22 mm, aperture ratio F / 1.0, angle of view 2ω = 28 °
f1 = 27.25mm
1 <f1 / f = 1.50
0.5 <FB / f = 0.72
Figure 2010113191
Figure 2010113191
Figure 2010113191

非球面係数
面番号Ｓ２２

Figure 2010113191
Aspheric coefficient surface number S22
Figure 2010113191

面番号Ｓ２３

Figure 2010113191
Surface number S23
Figure 2010113191

面番号Ｓ２４

Figure 2010113191
Figure 2010113191
Figure 2010113191
 Surface number S24
Figure 2010113191
Figure 2010113191
Figure 2010113191

面番号Ｓ２３

Figure 2010113191
Surface number S23
Figure 2010113191

なお、回折光学素子面（回折面）は、第２レンズＬ２の第１面に限定されず、その第２レンズＬ２の第２面に設けてもよい。すなわち、そのレンズの一方の面に回折光学素子面を設けた場合に、その裏面にも回折光学素子面を設置しても、光学特性は変わらず、良好な画像を得ることができ、過酷な環境にも耐えうる耐久性を備えている。 The diffractive optical element surface (diffractive surface) is not limited to the first surface of the second lens L2, and may be provided on the second surface of the second lens L2. That is, when a diffractive optical element surface is provided on one surface of the lens, even if a diffractive optical element surface is provided on the rear surface, the optical characteristics are not changed, and a good image can be obtained. Durable enough to withstand the environment.

図７は、実施例４の光路図である。図８は、実施例４の収差図である。   FIG. 7 is an optical path diagram of the fourth embodiment. FIG. 8 is an aberration diagram of Example 4.

本実施例４において、回折光学素子面（回折面）は、光路差関数Ψ（ｈ）の係数がつけられた第２レンズＬ２の第１面である。また、第１レンズＬ１の第２面、第２レンズＬ２の第１面および第２レンズＬ２の第２面は非球面である。   In Example 4, the diffractive optical element surface (diffractive surface) is the first surface of the second lens L2 to which the coefficient of the optical path difference function Ψ (h) is attached. The second surface of the first lens L1, the first surface of the second lens L2, and the second surface of the second lens L2 are aspheric.

実施例４の赤外線光学系３１のレンズ系の構成は、下記のとおりである。   The configuration of the lens system of the infrared optical system 31 of Example 4 is as follows.

物体側Ｐより順に、物体側Ｐに凸面（Ｓ３１）を向けた凸メニスカスの第１レンズＬ３１と、物体側Ｐに凹面（Ｓ３３）を向けた凸メニスカスの第２レンズＬ３２の最小枚数２群２枚で構成する。   In order from the object side P, the first lens L31 having a convex meniscus having a convex surface (S31) directed toward the object side P and the second lens group 2 of the second lens L32 having a convex meniscus having a concave surface (S33) directed toward the object side P Consists of sheets.

第１レンズＬ３１と第２レンズＬ３２は、いずれもカルコゲナイドレンズ材料で形成されている。   The first lens L31 and the second lens L32 are both made of a chalcogenide lens material.

ｆ＝１８．２２ｍｍ、口径比Ｆ／１．０、画角２ω＝２８°
ｆ１＝２３．６９ｍｍ
１＜ｆ１／ｆ＝１．３０
０．５＜ＦＢ／ｆ＝０．６９

Figure 2010113191
Figure 2010113191
Figure 2010113191
 f = 18.22 mm, aperture ratio F / 1.0, angle of view 2ω = 28 °
f1 = 23.69mm
1 <f1 / f = 1.30
0.5 <FB / f = 0.69
Figure 2010113191
Figure 2010113191
Figure 2010113191

非球面係数
面番号Ｓ３２

Figure 2010113191
Aspheric coefficient surface number S32
Figure 2010113191

面番号Ｓ３３

Figure 2010113191
Surface number S33
Figure 2010113191

面番号Ｓ３４

Figure 2010113191
Figure 2010113191
Figure 2010113191
 Surface number S34
Figure 2010113191
Figure 2010113191
Figure 2010113191

面番号Ｓ３３

Figure 2010113191
Surface number S33
Figure 2010113191

なお、回折光学素子面（回折面）は、第２レンズＬ２の第１面に限定されず、その第２レンズＬ２の第２面に設けてもよい。すなわち、そのレンズの一方の面に回折光学素子面を設けた場合に、その裏面にも回折光学素子面を設置しても、光学特性は変わらず、良好な画像を得ることができ、過酷な環境にも耐えうる耐久性を備えている。 The diffractive optical element surface (diffractive surface) is not limited to the first surface of the second lens L2, and may be provided on the second surface of the second lens L2. That is, when a diffractive optical element surface is provided on one surface of the lens, even if a diffractive optical element surface is provided on the rear surface, the optical characteristics are not changed, and a good image can be obtained. Durable enough to withstand the environment.

図９は、実施例５の光路図である。図１０は、実施例５の収差図である。   FIG. 9 is an optical path diagram of the fifth embodiment. FIG. 10 is an aberration diagram of Example 5.

本実施例５において、回折光学素子面（回折面）は、光路差関数Ψ（ｈ）の係数がつけられた第２レンズＬ２の第１面および第２面である。また、第１レンズＬ１の第２面、第２レンズＬ２の第１面および第２レンズＬ２の第２面は非球面である。   In Example 5, the diffractive optical element surfaces (diffraction surfaces) are the first surface and the second surface of the second lens L2 to which the coefficient of the optical path difference function Ψ (h) is attached. The second surface of the first lens L1, the first surface of the second lens L2, and the second surface of the second lens L2 are aspheric.

実施例５の赤外線光学系４１のレンズ系の構成は、下記のとおりである。   The configuration of the lens system of the infrared optical system 41 of Example 5 is as follows.

物体側Ｐより順に、物体側Ｐに凸面（Ｓ４１）を向けた凸メニスカスの第１レンズＬ４１と、物体側Ｐに凹面（Ｓ４３）を向けた凸メニスカスの第２レンズＬ４２の最小枚数２群２枚で構成する。   In order from the object side P, a minimum number of two groups 2 of a convex meniscus first lens L41 having a convex surface (S41) facing the object side P and a convex meniscus second lens L42 having a concave surface (S43) facing the object side P. Consists of sheets.

第１レンズＬ４１と第２レンズＬ４２は、いずれもカルコゲナイドレンズ材料で形成されている。   The first lens L41 and the second lens L42 are both made of a chalcogenide lens material.

ｆ＝１８．２２ｍｍ、口径比Ｆ／１．０、画角２ω＝２８°
ｆ１＝２４．８９ｍｍ
１＜ｆ１／ｆ＝１．３６
０．５＜ＦＢ／ｆ＝０．５５

Figure 2010113191
Figure 2010113191
Figure 2010113191
 f = 18.22 mm, aperture ratio F / 1.0, angle of view 2ω = 28 °
f1 = 24.89mm
1 <f1 / f = 1.36
0.5 <FB / f = 0.55
Figure 2010113191
Figure 2010113191
Figure 2010113191

非球面係数
面番号Ｓ４２

Figure 2010113191
Aspheric coefficient surface number S42
Figure 2010113191

面番号Ｓ４３

Figure 2010113191
Surface number S43
Figure 2010113191

面番号Ｓ４４

Figure 2010113191
Figure 2010113191
Figure 2010113191
 Surface number S44
Figure 2010113191
Figure 2010113191
Figure 2010113191

面番号Ｓ４３

Figure 2010113191
Surface number S43
Figure 2010113191

面番号Ｓ４４

Figure 2010113191
Surface number S44
Figure 2010113191

実施例１の光路図である。2 is an optical path diagram of Example 1. FIG. 実施例１の収差図である。FIG. 6 is an aberration diagram of Example 1. 実施例２の光路図である。6 is an optical path diagram of Example 2. FIG. 実施例２の収差図である。FIG. 6 is an aberration diagram of Example 2. 実施例３の光路図である。FIG. 6 is an optical path diagram of Example 3. 実施例３の収差図である。FIG. 6 is an aberration diagram of Example 3. 実施例４の光路図である。FIG. 6 is an optical path diagram of Example 4. 実施例４の収差図である。FIG. 6 is an aberration diagram of Example 4. 実施例５の光路図である。10 is an optical path diagram of Example 5. FIG. 実施例５の収差図である。FIG. 6 is an aberration diagram of Example 5.

符号の説明Explanation of symbols

１、１１、２１、３１、４１ 赤外線光学系
Ｌ１、Ｌ１１、Ｌ２１、Ｌ３１、Ｌ４１ 第１レンズ
Ｌ２、Ｌ１２、Ｌ２２、Ｌ３２、Ｌ４２ 第２レンズ
Ｐ 物体側 1, 11, 21, 31, 41 Infrared optical system L1, L11, L21, L31, L41 First lens L2, L12, L22, L32, L42 Second lens P Object side

Claims (4)

３μｍから１４μｍまでの赤外線から遠赤外線までの波長域で用いられ、物体側より順に、物体側に凸面を向けた凸メニスカスの第１レンズと、物体側に凹面を向けた凸メニスカスの第２レンズの２枚のレンズで構成され、第１レンズと第２レンズの少なくとも一方の両面を回折光学素子面としたことを特徴とする赤外線光学系。   A convex meniscus first lens having a convex surface facing the object side and a convex meniscus second lens having a concave surface facing the object side, which are used in the wavelength range from infrared to far infrared from 3 μm to 14 μm in order from the object side. An infrared optical system comprising: a diffractive optical element surface on at least one of the first lens and the second lens. 第１レンズと第２レンズが、いずれもカルコゲナイドレンズ材料で形成されていることを特徴とする請求項１に記載の赤外線光学系   2. The infrared optical system according to claim 1, wherein both the first lens and the second lens are made of a chalcogenide lens material. 第１レンズと第２レンズが、同じ赤外透過材料で形成されていることを特徴とする請求項１に記載の赤外線光学系。   The infrared optical system according to claim 1, wherein the first lens and the second lens are formed of the same infrared transmitting material. 以下の条件式（１）を満たすことを特徴とする請求項１〜３のいずれか１項に記載の赤外線光学系：
１．２ ＜ ｆ１／ｆ ＜ ２．０・・・条件式（１）、
但し、
ｆ：全系の焦点距離、
ｆ１：対物レンズの焦点距離。 The infrared optical system according to any one of claims 1 to 3, wherein the following conditional expression (1) is satisfied:
1.2 <f1 / f <2.0 Conditional expression (1),
However,
f: focal length of the entire system,
f1: Focal length of the objective lens.
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JP2011128538A (en) * 2009-12-21 2011-06-30 Fujifilm Corp Infrared imaging lens and imaging apparatus
KR101274610B1 (en) 2011-06-03 2013-06-17 주식회사 소모홀딩스엔테크놀러지 far-infrared camera lens unit
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JP2013145301A (en) * 2012-01-13 2013-07-25 Tamron Co Ltd Infrared fixed-focus lens
US9182574B2 (en) 2012-01-13 2015-11-10 Tamron Co., Ltd. Infrared fixed-focus lens
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JP2014109638A (en) * 2012-11-30 2014-06-12 Tamron Co Ltd Infrared lens
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WO2015023083A1 (en) * 2013-08-12 2015-02-19 주식회사 소모홀딩스엔테크놀러지 Wide-angle lens for far-infrared camera
US9563041B2 (en) 2013-09-20 2017-02-07 Tamron Co., Ltd Optical system for an infrared ray
WO2016027786A1 (en) * 2014-08-20 2016-02-25 コニカミノルタ株式会社 Far-infrared lens, imaging optical device and digital equipment
WO2017094744A1 (en) 2015-12-03 2017-06-08 京セラオプテック株式会社 Infrared image-forming lens
US11119298B2 (en) 2015-12-03 2021-09-14 Kyocera Corporation Infrared imaging lens system
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CN109782415B (en) * 2017-11-14 2021-02-26 新巨科技股份有限公司 Two-piece infrared single-wavelength projection lens set

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