JP6797747B2 - Eyepiece optical system and observation device with it - Google Patents
Eyepiece optical system and observation device with it Download PDFInfo
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本発明は、接眼光学系及びそれを有する観察装置に関し、例えばビデオカメラ、スチルカメラ、放送用カメラに用いられる電子ビューファインダーにおいて、画像表示素子の画像表示面に表示される画像を観察するのに好適なものである。 The present invention relates to an eyepiece optical system and an observation device having the same, for observing an image displayed on an image display surface of an image display element, for example, in an electronic viewfinder used in a video camera, a still camera, or a broadcasting camera. It is suitable.
従来、ビデオカメラ、スチルカメラ等の撮像装置（カメラ）に用いられている電子ビューファインダー（観察装置）においては、液晶画面等に表示した画像を拡大観察する為に接眼光学系が用いられている。電子ビューファインダーにおいて、画像表示面を視認性が良く、見やすくするには、観察倍率が高く、しかもアイレリーフが長いこと等が必要になってくる。 Conventionally, in an electronic viewfinder (observation device) used in an imaging device (camera) such as a video camera or a still camera, an eyepiece optical system is used for magnifying and observing an image displayed on a liquid crystal screen or the like. .. In the electronic viewfinder, in order to make the image display surface highly visible and easy to see, it is necessary to have a high observation magnification and a long eye relief.
更に観察装置の小型化の要望より、観察装置に用いる画像表示素子は小さな寸法（例えば対角長で２０ｍｍ以下）であることが要求されている。 Further, from the demand for miniaturization of the observation device, the image display element used in the observation device is required to have a small size (for example, a diagonal length of 20 mm or less).
従来、観察倍率の高い接眼光学系が種々と提案されている（特許文献１乃至３）。 Conventionally, various eyepiece optical systems having a high observation magnification have been proposed (Patent Documents 1 to 3).
特許文献１では、画像表示素子側より観察側に向かって、正の屈折力の第１レンズ、負の屈折力の第２レンズ、正又は負の屈折力の第３レンズ、正の屈折力の第４レンズよりなる接眼光学系を開示している。 In Patent Document 1, from the image display element side toward the observation side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive or negative refractive power, and a positive refractive power. An eyepiece optical system including a fourth lens is disclosed.
特許文献１では、全系の小型化を図りつつ、諸収差を良好に補正するために、少なくとも２枚の正の屈折力のレンズ、少なくとも１枚の負の屈折力のレンズ、そして回折光学素子を用いている。 In Patent Document 1, at least two lenses having a positive refractive power, at least one lens having a negative refractive power, and a diffractive optical element are used in order to satisfactorily correct various aberrations while reducing the size of the entire system. Is used.
また、特許文献２では、負の屈折力のレンズ群と、正の屈折面のレンズ群よりなる内視鏡用接眼レンズを開示している。 Further, Patent Document 2 discloses an eyepiece for an endoscope including a lens group having a negative refractive power and a lens group having a positive refracting surface.
また、特許文献３では、画像表示素子側より観察側へ順に、両凸形状で、正の屈折力の第１レンズ、負の屈折力の第２レンズ、正の屈折力の第３レンズと、正の屈折力の第４レンズからなる接眼光学系を開示している。特許文献３では高い観察倍率を有しつつ、諸収差が良好に補正された接眼光学系を開示している。 Further, in Patent Document 3, in order from the image display element side to the observation side, a biconvex first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power are used. An eyepiece optical system including a fourth lens having a positive refractive power is disclosed. Patent Document 3 discloses an eyepiece optical system in which various aberrations are satisfactorily corrected while having a high observation magnification.
観察装置に用いられる接眼光学系において、観察倍率が高く、しかもアイレリーフを長く確保するには、接眼光学系のレンズ構成及び各レンズの屈折力等を適切に設定することが重要になってくる。この他、小型の画像表示面を用いるときは、画像表示面の大きさに対する接眼光学系の屈折力の比等を適切に設定することが重要になってくる。 In the eyepiece optical system used for the observation device, in order to secure a high observation magnification and a long eye relief, it is important to appropriately set the lens configuration of the eyepiece optical system and the refractive power of each lens. .. In addition, when using a small image display surface, it is important to appropriately set the ratio of the refractive power of the eyepiece optical system to the size of the image display surface.
特許文献１に開示された画像表示装置用の接眼レンズは、曲面パネルや回折光学素子、高屈折率材料を使用することによって、高い観察倍率を確保しつつ、諸収差を補正している。そのため光学性能や仕様は確保しやすいが、製造が困難になる傾向があった。 The eyepiece for an image display device disclosed in Patent Document 1 uses a curved panel, a diffractive optical element, and a high refractive index material to correct various aberrations while ensuring a high observation magnification. Therefore, it is easy to secure the optical performance and specifications, but it tends to be difficult to manufacture.
特許文献２に開示されている内視鏡用接眼レンズは、高屈折率材料のレンズと非球面レンズを使用することによってレンズ枚数を減らし、高い観察倍率を確保している。しかしながら、高屈折率の材料を多用しているため、製造が難しくなる傾向があった。 The eyepiece for an endoscope disclosed in Patent Document 2 reduces the number of lenses by using a lens made of a high refractive index material and an aspherical lens, and secures a high observation magnification. However, since many materials having a high refractive index are used, the production tends to be difficult.
特許文献３に開示された接眼光学系では比較的低屈折率の材料を使用し、高い観察倍率を確保している。しかし、高倍率化のために光線を跳ね上げる第１レンズ面と第２レンズ面のレンズ面の曲率がきつくなり、急激に光線が変化する形状をしている。このために像面湾曲が発生しやすい。 The eyepiece optical system disclosed in Patent Document 3 uses a material having a relatively low refractive index to ensure a high observation magnification. However, in order to increase the magnification, the curvatures of the lens surfaces of the first lens surface and the second lens surface that bounce off the light rays become tight, and the light rays change rapidly. For this reason, curvature of field is likely to occur.
また、非球面を多用することで諸収差の補正を容易にしているため、製造が複雑になる傾向があった。 Further, since the correction of various aberrations is facilitated by using a large number of aspherical surfaces, the manufacturing tends to be complicated.
本発明は、諸収差を良好に抑え高い光学性能を確保しつつ、製造が容易でしかも高視野の観察が容易な接眼光学系の提供を目的としている。 An object of the present invention is to provide an eyepiece optical system that is easy to manufacture and easy to observe in a high field of view while satisfactorily suppressing various aberrations and ensuring high optical performance.
本発明の接眼光学系は、物体側から観察側へ順に配置された、正の屈折力の第１レンズ、負の屈折力の第２レンズ、第３レンズ、正の屈折力の第４レンズより構成される接眼光学系であって、前記第１レンズ乃至前記第４レンズの各レンズの材料のｄ線における屈折率の平均値をＮｄａ、前記第１レンズの観察側のレンズ面の曲率半径をＬ１Ｒ２、前記第２レンズの物体側のレンズ面の曲率半径をＬ２Ｒ１、前記第３レンズと前記第４レンズの合成焦点距離をｆ３４、前記接眼光学系の焦点距離をｆ、前記第１レンズと前記第２レンズの光軸上の間隔をｄ３、前記第２レンズと前記第３レンズの光軸上の間隔をｄ５とするとき、
１．５５９≦Ｎｄａ≦１．７３０
−５．２≦（Ｌ２Ｒ１＋Ｌ１Ｒ２）／（Ｌ２Ｒ１−Ｌ１Ｒ２）≦０．０
０．６８≦ｆ３４／ｆ≦１．２５
０．００≦ｄ５／ｄ３≦０．７５
なる条件式を満たすことを特徴としている。
また、本発明の他の接眼光学系は、物体側から観察側へ順に配置された、正の屈折力の第１レンズ、負の屈折力の第２レンズ、第３レンズ、正の屈折力の第４レンズより構成される接眼光学系であって、前記第１レンズ乃至前記第４レンズの各レンズの材料のｄ線における屈折率の平均値をＮｄａ、前記第１レンズの観察側のレンズ面の曲率半径をＬ１Ｒ２、前記第２レンズの物体側のレンズ面の曲率半径をＬ２Ｒ１、前記第３レンズと前記第４レンズの合成焦点距離をｆ３４、前記接眼光学系の焦点距離をｆ、前記第１レンズと前記第２レンズの光軸上の間隔をｄ３、前記第２レンズと前記第３レンズの光軸上の間隔をｄ５とするとき、
１．５２０≦Ｎｄａ≦１．７３０
−５．２≦（Ｌ２Ｒ１＋Ｌ１Ｒ２）／（Ｌ２Ｒ１−Ｌ１Ｒ２）≦０．０
０．７７≦ｆ３４／ｆ≦１．３０
０．００≦ｄ５／ｄ３≦０．７５
なる条件式を満たすことを特徴としている。
The eyepiece optical system of the present invention is composed of a first lens having a positive refractive force, a second lens having a negative refractive force, a third lens, and a fourth lens having a positive refractive force arranged in order from the object side to the observation side. In the eyepiece optical system, the average value of the refractive index of the material of each lens of the first lens to the fourth lens in the d line is Nda, and the radius of curvature of the lens surface on the observation side of the first lens is L1R2, the radius of curvature of the lens surface of the second lens on the object side is L2R1, the combined focal distance of the third lens and the fourth lens is f34, the focal distance of the eyepiece optical system is f, and the first lens and the said When the distance on the optical axis of the second lens is d3 and the distance between the second lens and the third lens on the optical axis is d5,
1.559 ≤ Nda ≤ 1.730
- 5.2 ≦ (L2R1 + L1R2) / (L2R1-L1R2) ≦ 0.0
0.68 ≤ f34 / f ≤ 1.25
0.00≤d5 / d3≤0.75
It is characterized by satisfying the conditional expression.
Further, in the other eyepiece optical system of the present invention, the first lens having a positive refractive force, the second lens having a negative refractive force, the third lens, and the positive refractive force are arranged in order from the object side to the observation side. An eyepiece optical system composed of a fourth lens, in which the average value of the refractive index of the material of each lens of the first lens to the fourth lens in the d line is Nda, and the lens surface on the observation side of the first lens. The radius of curvature is L1R2, the radius of curvature of the lens surface of the second lens on the object side is L2R1, the combined focal distance of the third lens and the fourth lens is f34, the focal distance of the eyepiece optical system is f, and the first When the distance between the 1 lens and the second lens on the optical axis is d3 and the distance between the second lens and the third lens on the optical axis is d5,
1.520 ≤ Nda ≤ 1.730
-5.2 ≤ (L2R1 + L1R2) / (L2R1-L1R2) ≤ 0.0
0.77 ≦ f34 / f ≦ 1.30
0.00≤d5 / d3≤0.75
It is characterized by satisfying the conditional expression.
本発明によれば、諸収差を良好に抑え高い光学性能を確保しつつ、製造が容易でしかも高視野の観察が容易な接眼光学系が得られる。 According to the present invention, it is possible to obtain an eyepiece optical system that is easy to manufacture and easy to observe in a high field of view while satisfactorily suppressing various aberrations and ensuring high optical performance.
以下、本発明の接眼光学系及びそれを有する観察装置について説明する。本発明の接眼光学系は、画像表示面に表示された画像を観察するための接眼光学系である。接眼光学系は画像表示面側から観察側へ順に配置された、正の屈折力の第１レンズ、負の屈折力の第２レンズ、第３レンズ、正の屈折力の第４レンズより構成されている。 Hereinafter, the eyepiece optical system of the present invention and an observation device having the same will be described. The eyepiece optical system of the present invention is an eyepiece optical system for observing an image displayed on an image display surface. The eyepiece optical system is composed of a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens, and a fourth lens having a positive refractive power, which are arranged in order from the image display surface side to the observation side. ing.
図１は本発明の接眼光学系の実施例１のレンズ断面図である。図２は本発明の接眼光学系の実施例１の視度が−１．０ディオプター（標準視度）における収差図である。 FIG. 1 is a cross-sectional view of a lens of Example 1 of the eyepiece optical system of the present invention. FIG. 2 is an aberration diagram when the diopter of Example 1 of the eyepiece optical system of the present invention is −1.0 diopter (standard diopter).
図３は本発明の接眼光学系の実施例２のレンズ断面図である。図４は本発明の接眼光学系の実施例２の視度が−１．０ディオプターにおける収差図である。 FIG. 3 is a cross-sectional view of the lens of Example 2 of the eyepiece optical system of the present invention. FIG. 4 is an aberration diagram when the diopter of Example 2 of the eyepiece optical system of the present invention is −1.0 diopter.
図５は本発明の接眼光学系の実施例３のレンズ断面図である。図６は本発明の接眼光学系の実施例３の視度が−１．０ディオプターにおける収差図である。 FIG. 5 is a cross-sectional view of the lens of Example 3 of the eyepiece optical system of the present invention. FIG. 6 is an aberration diagram when the diopter of Example 3 of the eyepiece optical system of the present invention is −1.0 diopter.
図７は本発明の接眼光学系の実施例４のレンズ断面図である。図８は本発明の接眼光学系の実施例４の視度が−１．０ディオプターにおける収差図である。 FIG. 7 is a cross-sectional view of the lens of Example 4 of the eyepiece optical system of the present invention. FIG. 8 is an aberration diagram when the diopter of Example 4 of the eyepiece optical system of the present invention is −1.0 diopter.
図９は本発明の接眼光学系の実施例５のレンズ断面図である。図１０は本発明の接眼光学系の実施例５の視度が−１．０ディオプターにおける収差図である。 FIG. 9 is a cross-sectional view of the lens of Example 5 of the eyepiece optical system of the present invention. FIG. 10 is an aberration diagram when the diopter of Example 5 of the eyepiece optical system of the present invention is −1.0 diopter.
図１１は本発明の接眼光学系の実施例６のレンズ断面図である。図１２は本発明の接眼光学系の実施例６の視度が−１．０ディオプターにおける収差図である。 FIG. 11 is a cross-sectional view of the lens of Example 6 of the eyepiece optical system of the present invention. FIG. 12 is an aberration diagram when the diopter of Example 6 of the eyepiece optical system of the present invention is −1.0 diopter.
各実施例の接眼光学系は、デジタルカメラやビデオカメラ等の撮像装置の電子ビューファインダー（観察装置）に用いられる。レンズ断面図において左方は画像表示面側、右方は観察側（射出瞳側）である。レンズ断面図においてＬ０は接眼光学系である。Ｌｉは第ｉレンズである。ＩＰは液晶又は有機ＥＬ等よりなる画像表示素子の画像表示面である。ＥＰは観察のための観察面（アイポイント）（射出瞳）である。ＣＧ１はカバーガラスである。 The eyepiece optical system of each embodiment is used as an electronic viewfinder (observation device) of an imaging device such as a digital camera or a video camera. In the cross-sectional view of the lens, the left side is the image display surface side, and the right side is the observation side (exit pupil side). In the cross-sectional view of the lens, L0 is an eyepiece optical system. Li is the i-th lens. IP is an image display surface of an image display element made of liquid crystal, organic EL, or the like. EP is an observation surface (eye point) (exit pupil) for observation. CG1 is a cover glass.
各収差図のうち球面収差図において、実線のｄはｄ線（波長５８７．６ｎｍ）、点線のＦはＦ線（波長４８６．１ｎｍ）を示す。非点収差図においてΔＳｄはｄ線のサジタル像面、ΔＭｄはｄ線のメリディオナル像面を示す。ΔＳＦはＦ線のサジタル像面、ΔＭＦはＦ線のメリディオナル像面を示す。歪曲はｄ線について示している。倍率色収差はＦ線について示している。Ｈは画像表示面の対角線長の半分（最大像高）である。数値は後述する数値データをｍｍ単位で表したときの値である。 In the spherical aberration diagram of each aberration diagram, the solid line d indicates the d line (wavelength 587.6 nm), and the dotted line F indicates the F line (wavelength 486.1 nm). In the astigmatism diagram, ΔSd indicates the sagittal image plane of the d line, and ΔMd indicates the meridional image plane of the d line. ΔSF indicates the sagittal image plane of the F line, and ΔMF indicates the meridional image plane of the F line. The distortion is shown for the d line. Chromatic aberration of magnification is shown for the F line. H is half the diagonal length of the image display surface (maximum image height). The numerical value is a value when the numerical data described later is expressed in millimeters.
画像表示素子の画像表示面の対角線長が約２０ｍｍ以下の小型の画像表示面（表示パネル）を大きな観察視野（視野角約３０度以上）で観察するためには、接眼光学系全体で強い正の屈折力（パワー）を持つ必要がある。そのためには、接眼光学系を構成する各レンズに強い正の屈折力、負の屈折力が必要になる。そうすると多く場合、像面湾曲、倍率色収差が増大し、これらの諸収差の補正が難しくなる。 In order to observe a small image display surface (display panel) with a diagonal length of about 20 mm or less on the image display surface of the image display element with a large observation field of view (viewing angle of about 30 degrees or more), the entire eyepiece optical system is strongly positive. It is necessary to have the refractive power (power) of. For that purpose, each lens constituting the eyepiece optical system needs a strong positive refractive power and a negative refractive power. Then, in many cases, curvature of field and chromatic aberration of magnification increase, and it becomes difficult to correct these various aberrations.
そこで、各実施例に係る接眼光学系では、各レンズ断面図に示すように、画像表示面ＩＰ側（物体側）より観察面（アイポイント）ＥＰ側に順に、４つのレンズ群より構成している。具体的には、正の屈折力の第１レンズＬ１、負の屈折力の第２レンズＬ２、正または負の屈折力の第３レンズＬ３、正の屈折力の第４レンズＬ４によって構成している。 Therefore, in the eyepiece optical system according to each embodiment, as shown in each lens cross-sectional view, four lens groups are configured in order from the image display surface IP side (object side) to the observation surface (eye point) EP side. There is. Specifically, it is composed of a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a positive or negative refractive power, and a fourth lens L4 having a positive refractive power. There is.
各実施例において観察面ＥＰは、画像表示面ＩＰの最周辺からの光線が観測者の瞳を通過する範囲内であれば光軸方向に移動しても良い。また、レンズ最終面（第４レンズＬ４の観察側の面）から観察面ＥＰまでの距離をアイレリーフとする。カバーガラスは画像表示面ＩＰやレンズを保護するプレートであり、画像表示面ＩＰからレンズの間やレンズと観察面ＥＰの間に設けても良いし、また必ずしも設置しなくても良い。 In each embodiment, the observation surface EP may move in the optical axis direction as long as the light rays from the outermost periphery of the image display surface IP pass through the observer's pupil. Further, the distance from the final surface of the lens (the surface on the observation side of the fourth lens L4) to the observation surface EP is defined as the eye relief. The cover glass is a plate that protects the image display surface IP and the lens, and may or may not be provided between the image display surface IP and the lens or between the lens and the observation surface EP.
本発明の接眼レンズＬ０において、第１レンズＬ１乃至第４レンズＬ４の各レンズの材料のｄ線における屈折率の平均値をＮｄａとする。第１レンズＬ１の観察側のレンズ面の曲率半径をＬ１Ｒ２、第２レンズＬ２の画像表示面側のレンズ面の曲率半径をＬ２Ｒ１とする。第３レンズＬ３と第４レンズＬ４の合成焦点距離をｆ３４とする。接眼光学系の焦点距離をｆとする。 In the eyepiece L0 of the present invention, the average value of the refractive indexes of the materials of the first lens L1 to the fourth lens L4 on the d line is Nda. The radius of curvature of the lens surface on the observation side of the first lens L1 is L1R2, and the radius of curvature of the lens surface of the second lens L2 on the image display surface side is L2R1. Let the combined focal length of the third lens L3 and the fourth lens L4 be f34. Let f be the focal length of the eyepiece optical system.
このとき、
１．５２０≦Ｎｄａ≦１．７３０ ・・・（１）
−１５．０≦（Ｌ２Ｒ１＋Ｌ１Ｒ２）／（Ｌ２Ｒ１−Ｌ１Ｒ２）≦０．０ ・・・（２）
０．６８≦ｆ３４／ｆ≦１．３０ ・・・（３）
なる条件式を満たす。
At this time,
1.520 ≤ Nda ≤ 1.730 ... (1)
-15.0 ≦ (L2R1 + L1R2) / (L2R1-L1R2) ≦ 0.0 ・ ・ ・ (2)
0.68 ≤ f34 / f ≤ 1.30 ... (3)
Satisfy the conditional expression.
次に前述の各条件式の技術的意味について説明する。 Next, the technical meaning of each of the above conditional expressions will be described.
条件式（１）は、第１レンズＬ１乃至第４レンズＬ４の各レンズの材料のｄ線における屈折率の平均値を規定している。条件式（１）の上限を超えて、各レンズの材料の屈折率が高くなると、全系のパワーを強くすることが出来、高い観察倍率を得るのが（高視野角化）容易になる。しかしながら、高い屈折率の材料としては、例えばガラス等を多用しなければならず、製造が難しくなる。また、下限値を下回り各レンズの材料の屈折率が低くなると、全系の屈折力が弱くなり、高視野角化するのが困難になる。 The conditional expression (1) defines the average value of the refractive indexes of the materials of the first lens L1 to the fourth lens L4 on the d-line. When the refractive index of the material of each lens increases beyond the upper limit of the conditional expression (1), the power of the entire system can be increased, and it becomes easy to obtain a high observation magnification (high viewing angle). However, as a material having a high refractive index, for example, glass or the like must be frequently used, which makes production difficult. Further, when the refractive index of the material of each lens becomes lower than the lower limit value, the refractive power of the entire system becomes weak and it becomes difficult to increase the viewing angle.
条件式（２）は、第１レンズＬ１と第２レンズＬ２との間で形成される空気レンズの形状を規定している。条件式（２）は高い観察倍率を保ちつつ像面湾曲を良好に補正する為のものである。各実施例では高い観察倍率を得るために第１レンズＬ１から射出される光線を、第２レンズＬ２で跳ね上げている。この条件式（２）の、下限値を下回ると第１レンズＬ１と第２レンズＬ２間で光線の曲がりが急になりすぎる為、諸収差の補正、特に像面湾曲の収差が困難になる。上限値を上回ると光線の跳ね上げが不十分になり、高い観察倍率を得るのが困難になる。 The conditional expression (2) defines the shape of the air lens formed between the first lens L1 and the second lens L2. Conditional expression (2) is for satisfactorily correcting curvature of field while maintaining a high observation magnification. In each embodiment, the light beam emitted from the first lens L1 is bounced up by the second lens L2 in order to obtain a high observation magnification. If it is less than the lower limit of the conditional expression (2), the bending of the light beam between the first lens L1 and the second lens L2 becomes too steep, so that it becomes difficult to correct various aberrations, especially the aberration of curvature of field. If the upper limit is exceeded, the bounce of light rays becomes insufficient, and it becomes difficult to obtain a high observation magnification.
条件式（３）は、第３レンズＬ３と第４レンズＬ４とからなる合成系の合成焦点距離と全系の焦点距離を規定している。条件式（３）の上限を越えると合成系の正の屈折力が弱くなり高い観察倍率を得るのが困難になる。条件式（３）の下限値を下回ると、合成系の正の屈折力が強くなり、十分な長さのアイレリーフを確保するのが困難になり、画像表示面の良好なる観察が困難になる。 The conditional expression (3) defines the composite focal length of the synthetic system including the third lens L3 and the fourth lens L4 and the focal length of the entire system. If the upper limit of the conditional expression (3) is exceeded, the positive refractive power of the synthetic system becomes weak and it becomes difficult to obtain a high observation magnification. If it falls below the lower limit of the conditional expression (3), the positive refractive power of the synthetic system becomes strong, it becomes difficult to secure an eye relief of a sufficient length, and it becomes difficult to observe the image display surface well. ..
好ましくは条件式（１）乃至（３）の数値範囲を次の如く設定するのが良い。
１．５５０≦Ｎｄａ≦１．７３０ ・・・（１ａ）
−１２．０≦（Ｌ２Ｒ１＋Ｌ１Ｒ２）／（Ｌ２Ｒ１−Ｌ１Ｒ２）≦０．０・・・（２ａ）
０．６８≦ｆ３４／ｆ≦１．２５ ・・・（３ａ）
更に好ましくは条件式（１ａ）乃至（３ａ）の数値範囲を次の如く設定するのが良い。
１．５５０≦Ｎｄａ≦１．７００ ・・・（１ｂ）
−１０．０≦（Ｌ２Ｒ１＋Ｌ１Ｒ２）／（Ｌ２Ｒ１−Ｌ１Ｒ２）≦０．０・・・（２ｂ）
０．７０≦ｆ３４／ｆ≦１．２５ ・・・（３ｂ）
以上のように、本発明によれば高い観察倍率で高い光学性能を有した電子ビューファインダーに最適な接眼光学系を得ることができる。
It is preferable to set the numerical range of the conditional expressions (1) to (3) as follows.
1.550 ≤ Nda ≤ 1.730 ... (1a)
-12.0 ≦ (L2R1 + L1R2) / (L2R1-L1R2) ≦ 0.0 ... (2a)
0.68 ≤ f34 / f ≤ 1.25 ... (3a)
More preferably, the numerical range of the conditional expressions (1a) to (3a) is set as follows.
1.550 ≤ Nda ≤ 1.700 ... (1b)
-10.0 ≦ (L2R1 + L1R2) / (L2R1-L1R2) ≦ 0.0 ... (2b)
0.70 ≦ f34 / f ≦ 1.25 ・ ・ ・ (3b)
As described above, according to the present invention, it is possible to obtain an optimal eyepiece optical system for an electronic viewfinder having high observation magnification and high optical performance.
各実施例において更に好ましくは次の条件式のうち１つ以上を満足するのが良い。第１レンズＬ１と第２レンズＬ２の光軸上の間隔をｄ３、第２レンズ群Ｌ２と第３レンズＬ３の光軸上の間隔をｄ５とする。画像を表示する画像表示素子と、画像表示素子の画像表示面ＩＰに表示される画像を観察するために用いられる接眼光学系を有する観察装置においては、画像表示素子の画像表示面の対角線長の半分をＰＮとする。画像表示面ＩＰから第１レンズＬ１の画像表示面側のレンズ面までの光軸上の距離をｄ１とする。 More preferably, one or more of the following conditional expressions is satisfied in each embodiment. The distance between the first lens L1 and the second lens L2 on the optical axis is d3, and the distance between the second lens group L2 and the third lens L3 on the optical axis is d5. In an observation device having an image display element for displaying an image and an eyepiece optical system used for observing an image displayed on the image display surface IP of the image display element, the diagonal length of the image display surface of the image display element Let half be PN. Let d1 be the distance on the optical axis from the image display surface IP to the lens surface on the image display surface side of the first lens L1.
このとき次の条件式のうち１つ以上を満足するのが良い。
０．００≦ｄ５／ｄ３≦０．７５ ・・・（４）
０．２５＜ＰＮ／ｆ＜０．５５ ・・・（５）
０．０≦ｄ１／ｆ＜０．８ ・・・（６）
次に前述の各条件式の技術的意味について説明する。条件式（４）は第２レンズＬ２と第３レンズＬ３の間隔に対する第１レンズＬ１と第２レンズＬ２の間隔の比を規定している。条件式（４）は大きな観察倍率を得つつ、倍率色収差を良好に補正するためのものである。
At this time, it is preferable to satisfy one or more of the following conditional expressions.
0.00≤d5 / d3≤0.75 ... (4)
0.25 <PN / f <0.55 ... (5)
0.0 ≦ d1 / f <0.8 ・ ・ ・ (6)
Next, the technical meaning of each of the above conditional expressions will be described. The conditional expression (4) defines the ratio of the distance between the first lens L1 and the second lens L2 to the distance between the second lens L2 and the third lens L3. The conditional expression (4) is for satisfactorily correcting the chromatic aberration of magnification while obtaining a large observation magnification.
条件式（４）の上限値を超えて、第２レンズＬ２と第３レンズＬ３の間隔が大きくなると、倍率色収差の補正が困難になる。また、第１レンズＬ１と第２レンズＬ２の間隔が狭くなると第２レンズＬ２へ入射する光束の光線角がきつくなり、特に像高の高いところでの像面湾曲が増大してくる。下限値を下回り、第１レンズＬ１と第２レンズＬ２の間隔が広がると、第２レンズに入射する光線高さが低くなる為、光線を跳ね上げ高い観察視野倍率を得ることが困難になる。 If the distance between the second lens L2 and the third lens L3 becomes larger than the upper limit of the conditional expression (4), it becomes difficult to correct the chromatic aberration of magnification. Further, when the distance between the first lens L1 and the second lens L2 becomes narrower, the light angle of the light beam incident on the second lens L2 becomes tighter, and the curvature of field increases particularly at a high image height. When the distance between the first lens L1 and the second lens L2 becomes wider than the lower limit value, the height of the light beam incident on the second lens becomes low, so that it becomes difficult to bounce the light ray and obtain a high observation field magnification.
条件式（５）は、画像表示素子の画像表示面の対角線長の半分と全系の焦点距離の比を規定している。条件式（５）は長いアイレリーフを確保しつつ、高い観察倍率を確保するためのものである。この条件式（５）の上限を超えて全系の焦点距離が短くなると、高い観察倍率には有利だが、高い光学性能の確保が難しくなる。条件式（５）の下限値を下回ると、全系の屈折力が弱くなり、高い観察倍率を確保することが難しくなる。 The conditional expression (5) defines the ratio of half the diagonal length of the image display surface of the image display element to the focal length of the entire system. The conditional expression (5) is for ensuring a high observation magnification while ensuring a long eye relief. If the focal length of the entire system becomes shorter than the upper limit of the conditional expression (5), it is advantageous for a high observation magnification, but it becomes difficult to secure high optical performance. If it falls below the lower limit of the conditional expression (5), the refractive power of the entire system becomes weak, and it becomes difficult to secure a high observation magnification.
条件式（６）は、画像表示素子の画像表示面から第１レンズＬ１の画像表示面側のレンズ面までの光軸上の長さと、全系の焦点距離を規定する。上限を越えると、画像表示面から第１レンズの画像表示面側のレンズ面までの間隔が広がるため、全系の小型化が困難になる。 Conditional expression (6) defines the length on the optical axis from the image display surface of the image display element to the lens surface on the image display surface side of the first lens L1 and the focal length of the entire system. If the upper limit is exceeded, the distance from the image display surface to the lens surface on the image display surface side of the first lens increases, which makes it difficult to reduce the size of the entire system.
好ましくは条件式（４）乃至（６）の数値範囲を次の如く設定するのが良い。
０．０≦ｄ５／ｄ３≦０．６ ・・・（４ａ）
０．２５＜ＰＮ／ｆ＜０．５０ ・・・（５ａ）
０．００≦ｄ１／ｆ＜０．６０ ・・・（６ａ）
更に好ましくは条件式（４ａ）乃至（６ａ）の数値範囲を次の如く設定するのが良い。
０．０≦ｄ５／ｄ３≦０．５ ・・・（４ｂ）
０．２５＜ＰＮ／ｆ＜０．４５ ・・・（５ｂ）
０．００≦ｄ１／ｆ＜０．５５ ・・・（６ｂ）
以上、本発明の好ましい実施形態について説明したが、本発明はこれらの実施形態に限定されず、その要旨の範囲内で種々の変形及び変更が可能である。
It is preferable to set the numerical range of the conditional expressions (4) to (6) as follows.
0.0 ≦ d5 / d3 ≦ 0.6 ・ ・ ・ (4a)
0.25 <PN / f <0.50 ... (5a)
0.00≤d1 / f <0.60 ... (6a)
More preferably, the numerical range of the conditional expressions (4a) to (6a) is set as follows.
0.0 ≤ d5 / d3 ≤ 0.5 ... (4b)
0.25 <PN / f <0.45 ... (5b)
0.00≤d1 / f <0.55 ... (6b)
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.
以下に本発明の各実施例に対応する数値データを示す。数値データにおいて、ωは視度が−１ディオプター（標準視度）時の見かけ視野（半画角）を示す。画像表示面ＩＰから観察側ＥＰへ順に「ｒｉ」は第ｉ番目の面の近軸曲率半径を示す。「ｄｉ」は画像表示面ＩＰから順に第ｉ番目の面と第ｉ＋１番目の面との間の軸上面間隔を示す。さらに、「Ｎｄｉ」は第ｉ番目の材料のｄ線（波長＝５７８．６ｎｍ）に対する屈折率を示し、「νｄｉ」は第ｉ番目の材料のｄ線に対するアッベ数を示す。ｒ０は画像表示面ＩＰ、ｒ９、ｒ１０はカバーガラスである。 The numerical data corresponding to each embodiment of the present invention is shown below. In the numerical data, ω indicates the apparent field of view (half angle of view) when the diopter is -1 diopter (standard diopter). From the image display surface IP to the observation side EP, "ri" indicates the paraxial radius of curvature of the i-th surface. “Di” indicates the axis upper surface distance between the i-th surface and the i + 1th surface in order from the image display surface IP. Further, "Ndi" indicates the refractive index of the i-th material with respect to the d-line (wavelength = 578.6 nm), and "νdi" indicates the Abbe number of the i-th material with respect to the d-line. r0 is an image display surface IP, and r9 and r10 are cover glasses.
なお、数値データでは、記載されている長さの単位は、特記の無い場合［ｍｍ］が使われている。ただし、光学系は、比例拡大または比例縮小しても同等の光学性能が得られるので、単位は［ｍｍ］に限定されることなく、他の適当な単位を用いることが出来る。なお、数値データにおいて近軸曲率半径の欄に「＊」の添え字が書かれている面は次の数１式によって定義される非球面形状である。 In the numerical data, the unit of the described length is [mm] unless otherwise specified. However, since the same optical performance can be obtained even if the optical system is proportionally expanded or decreased, the unit is not limited to [mm], and other appropriate units can be used. In the numerical data, the surface on which the subscript "*" is written in the column of the radius of curvature of the paraxial axis is an aspherical shape defined by the following equation (1).
なお、（数１式）において、xはレンズ面の頂点からの光軸方向の距離、hは光軸と垂直な方向の高さ、Rはレンズ面の頂点での近軸曲率半径、kは円錐定数、c2、c4、c6は多項式係数である。非球面係数において、「Ｅ−ｉ」は１０を底とする指数表現、すなわち「１０−ｉ」を表している。 In (Equation 1), x is the distance from the apex of the lens surface in the optical axis direction, h is the height in the direction perpendicular to the optical axis, R is the radius of curvature of the near axis at the apex of the lens surface, and k is. The cone constants c 2 , c 4 , and c 6 are polymorphic coefficients. In the aspherical coefficient, " Ei " represents an exponential notation with a base of 10, that is, "10- i ".
以上、本発明の好ましい実施形態について説明したが、本発明はこれらの実施形態に限定されず、その要旨の範囲内で種々の変形及び変更が可能である。 Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.
［数値データ１］
全体緒元
焦点距離 画像表示面対角長 ２ω[°]
18.97 12.6 35.0
レンズデータ
面 近軸曲率半径 軸上面間隔 屈折率（Nd） アッベ数（νd）
r0 表示パネル d1 可変
r1 553.90 d2 3.30 1.821 42.7
*r2 -14.37 d3 2.84
*r4 -7.18 d4 1.65 1.636 23.9
r5 -50.31 d5 0.62
*r6 -31.65 d6 2.63 1.592 67.0
r7 -16.79 d7 0.22
r8 50.42 d8 6.50 1.535 55.7
*r9 -13.05 d9 可変
r10 0.00 d10 0.80 1.492 57.4
r11 0.00 d11 23.00
EP
非球面係数
ｋ C2 C4 C6 C8
r2 0.00E+00 0.00E+00 3.88E-05 3.65E-08 0.00E+00
r3 -8.22E-01 0.00E+00 -9.72E-05 -9.34E-07 0.00E+00
r5 0.00E+00 0.00E+00 1.10E-05 0.00E+00 0.00E+00
r8 -2.30E+00 0.00E+00 -4.87E-05 2.14E-07 -2.73E-10
可変間隔
視度[dpt] 0 -3 +1 -1
d１ 7.76 6.66 8.15 7.42
d９ 1.51 2.60 1.12 1.85
［数値データ２］
全体緒元
焦点距離 画像表示面対角長 ２ω[°]
13.37 9.9 40.6
レンズデータ
面 近軸曲率半径 軸上面間隔 屈折率（Nd） アッベ数（νd）
r0 表示パネル d1 可変
*r1 13.421 d2 6.14 1.535 56.0
*r2 -8.334 d3 2.15
*r3 -5.637 d4 1.48 1.636 23.9
r4 -15.213 d5 0.17
r5 -34.833 d6 2.11 1.535 56.0
r6 -17.151 d7 0.15
r7 -152.436 d8 3.31 1.535 56.0
*r8 -11.013 d9 可変
r9 0.000 d10 0.70 1.492 57.4
r10 0.000 d11 18.00
EP
非球面係数
ｋ C2 C4 C6
r1 -6.34E+00 0.00E+00 0.00E+00 0.00E+00
r2 -1.68E+00 0.00E+00 -9.39E-05 0.00E+00
r3 -9.67E-01 0.00E+00 0.00E+00 0.00E+00
r8 -2.34E+00 0.00E+00 3.69E-06 3.31E-07
可変間隔
視度[dpt] 0 -3 +1 -1
d１ 5.74 5.14 5.91 5.55
d９ 0.67 1.26 0.50 0.86
［数値データ３］
全体緒元
焦点距離 画像表示面対角長 ２ω[°]
17.96 9.9 29.1
レンズデータ
面 近軸曲率半径 軸上面間隔 屈折率（Nd） アッベ数（νd）
r0 表示パネル d1 可変
r1 24.08 d2 4.02 1.532 55.8
*r2 -9.64 d3 3.62
*r3 -5.70 d4 1.50 1.636 23.9
r4 -35.58 d5 1.30
r5 -16.99 d6 3.32 1.532 55.8
*r6 -9.80 d7 0.33
r7 39.45 d8 3.23 1.532 55.8
*r8 -16.38 d9 可変
r9 0.00 d10 1.00 1.516 64.1
r10 0.00 d11 21.00
EP
非球面係数
ｋ C2 C4 C6
r2 0.00E+00 0.00E+00 2.28E-04 0.00E+00
r3 -4.72E-01 0.00E+00 1.67E-04 0.00E+00
r6 0.00E+00 0.00E+00 1.67E-05 0.00E+00
r8 0.00E+00 0.00E+00 6.95E-05 5.15E-08
可変間隔
視度[dpt] 0 -3 +1 -1
d１ 5.95 4.88 6.24 5.59
d９ 0.79 1.86 0.50 1.15
［数値データ４］
全体緒元
焦点距離 画像表示面対角長 ２ω[°]
16.50 9.9 32.0
レンズデータ
面 近軸曲率半径 軸上面間隔 屈折率（Nd） アッベ数（νd）
r0 表示パネル d1 可変
r1 21.75 d2 4.95 1.535 55.7
*r2 -10.27 d3 2.39
*r3 -5.62 d4 1.75 1.636 23.9
r4 -18.39 d5 0.22
*r5 -22.78 d6 2.62 1.535 55.7
r6 -11.84 d7 0.22
r7 105.20 d8 3.87 1.535 55.7
*r8 -13.85 d9 可変
r9 0.00 d10 0.80 1.492 57.4
r10 0.00 d11 21.00
EP
非球面係数
ｋ C2 C4 C6 C8
r2 0.00E+00 0.00E+00 1.57E-04 8.64E-07 0.00E+00
r3 -7.62E-01 0.00E+00 8.52E-05 0.00E+00 0.00E+00
r5 0.00E+00 0.00E+00 -7.94E-05 0.00E+00 0.00E+00
r8 0.00E+00 0.00E+00 1.27E-04 -3.08E-07 3.21E-09
可変間隔
視度[dpt] 0 -3 +1 -1
d１ 7.10 6.25 7.35 6.83
d９ 1.05 1.90 0.80 1.32
［数値データ５］
全体緒元
焦点距離 画像表示面対角長 ２ω[°]
25.22 16.8 35.1
レンズデータ
面 近軸曲率半径 軸上面間隔 屈折率（Nd） アッベ数（νd）
r0 表示パネル d1 可変
r1 49.56 d2 6.43 1.535 55.7
*r2 -17.25 d3 4.39
*r3 -8.84 d4 1.95 1.636 23.9
r4 -30.05 d5 0.22
r5 266.69 d6 5.26 1.531 55.9
r6 -27.75 d7 0.22
r7 235.81 d8 5.82 1.535 55.7
*r8 -18.98 d9 可変
r9 0.00 d10 0.80 1.492 57.4
r10 0.00 d11 30.00
EP
非球面係数
ｋ C2 C4 C6
r1 0.00E+00 0.00E+00 2.91E-05 0.00.E+00
r2 -1.33E+00 0.00E+00 -1.12E-04 0.00.E+00
r8 -2.17E+00 0.00E+00 1.01E-05 1.04E-08
可変間隔
視度[dpt] 0 -3 +1 -1
d１ 10.39 8.38 11.02 9.74
d９ 2.04 4.05 1.41 2.69
［数値データ６］
全体緒元
焦点距離 画像表示面対角長 ２ω[°]
20.46 12.6 33.1
レンズデータ
面 近軸曲率半径 軸上面間隔 屈折率（Nd） アッベ数（νd）
r0 表示パネル d1 可変
r1 59.97 d2 5.95 1.694 53.2
*r2 -11.68 d3 2.38
*r3 -6.74 d4 1.67 1.636 23.9
r4 -28.97 d5 0.00
r5 -28.97 d6 3.09 1.535 56.0
r6 -35.80 d7 0.25
r7 61.73 d8 5.49 1.535 56.0
*r8 -12.03 d9 可変
r9 0.00 d10 0.80 1.492 57.4
r10 0.00 d11 24.00
EP
非球面係数
ｋ C2 C4 C6
r2 0.00E+00 0.00E+00 1.15E-04 2.75E-07
r3 -9.93E-01 0.00E+00 0.00E+00 0.00E+00
r8 -5.80E-01 0.00E+00 6.48E-05 8.67E-08
可変間隔
視度[dpt] 0 -3 +1 -1
d１ 9.47 8.06 9.85 9.01
d９ 0.87 2.28 0.50 1.34
[Numerical data 1]
Overall focal length Image display surface Diagonal length 2ω [°]
18.97 12.6 35.0
Lens data Paraxial radius of curvature Axis top spacing Refractive index (Nd) Abbe number (νd)
r0 display panel d1 variable
r1 553.90 d2 3.30 1.821 42.7
* r2 -14.37 d3 2.84
* r4 -7.18 d4 1.65 1.636 23.9
r5 -50.31 d5 0.62
* r6 -31.65 d6 2.63 1.592 67.0
r7 -16.79 d7 0.22
r8 50.42 d8 6.50 1.535 55.7
* r9 -13.05 d9 variable
r10 0.00 d10 0.80 1.492 57.4
r11 0.00 d11 23.00
EP
Aspherical coefficient k C2 C4 C6 C8
r2 0.00E + 00 0.00E + 00 3.88E-05 3.65E-08 0.00E + 00
r3 -8.22E-01 0.00E + 00 -9.72E-05 -9.34E-07 0.00E + 00
r5 0.00E + 00 0.00E + 00 1.10E-05 0.00E + 00 0.00E + 00
r8 -2.30E + 00 0.00E + 00 -4.87E-05 2.14E-07 -2.73E-10
Variable interval diopter [dpt] 0 -3 +1 -1
d1 7.76 6.66 8.15 7.42
d9 1.51 2.60 1.12 1.85
[Numerical data 2]
Overall focal length Image display surface Diagonal length 2ω [°]
13.37 9.9 40.6
Lens data plane Paraxial radius of curvature Axis top spacing Refractive index (Nd) Abbe number (νd)
r0 display panel d1 variable
* r1 13.421 d2 6.14 1.535 56.0
* r2 -8.334 d3 2.15
* r3 -5.637 d4 1.48 1.636 23.9
r4 -15.213 d5 0.17
r5 -34.833 d6 2.11 1.535 56.0
r6 -17.151 d7 0.15
r7 -152.436 d8 3.31 1.535 56.0
* r8 -11.013 d9 Variable
r9 0.000 d10 0.70 1.492 57.4
r10 0.000 d11 18.00
EP
Aspherical coefficient
k C2 C4 C6
r1 -6.34E + 00 0.00E + 00 0.00E + 00 0.00E + 00
r2 -1.68E + 00 0.00E + 00 -9.39E-05 0.00E + 00
r3 -9.67E-01 0.00E + 00 0.00E + 00 0.00E + 00
r8 -2.34E + 00 0.00E + 00 3.69E-06 3.31E-07
Variable interval diopter [dpt] 0 -3 +1 -1
d1 5.74 5.14 5.91 5.55
d9 0.67 1.26 0.50 0.86
[Numerical data 3]
Overall focal length Image display surface Diagonal length 2ω [°]
17.96 9.9 29.1
Lens data plane Paraxial radius of curvature Axis top spacing Refractive index (Nd) Abbe number (νd)
r0 display panel d1 variable
r1 24.08 d2 4.02 1.532 55.8
* r2 -9.64 d3 3.62
* r3 -5.70 d4 1.50 1.636 23.9
r4 -35.58 d5 1.30
r5 -16.99 d6 3.32 1.532 55.8
* r6 -9.80 d7 0.33
r7 39.45 d8 3.23 1.532 55.8
* r8 -16.38 d9 Variable
r9 0.00 d10 1.00 1.516 64.1
r10 0.00 d11 21.00
EP
Aspherical coefficient
k C2 C4 C6
r2 0.00E + 00 0.00E + 00 2.28E-04 0.00E + 00
r3 -4.72E-01 0.00E + 00 1.67E-04 0.00E + 00
r6 0.00E + 00 0.00E + 00 1.67E-05 0.00E + 00
r8 0.00E + 00 0.00E + 00 6.95E-05 5.15E-08
Variable interval diopter [dpt] 0 -3 +1 -1
d1 5.95 4.88 6.24 5.59
d9 0.79 1.86 0.50 1.15
[Numerical data 4]
Overall focal length Image display surface Diagonal length 2ω [°]
16.50 9.9 32.0
Lens data Paraxial radius of curvature Axis top spacing Refractive index (Nd) Abbe number (νd)
r0 display panel d1 variable
r1 21.75 d2 4.95 1.535 55.7
* r2 -10.27 d3 2.39
* r3 -5.62 d4 1.75 1.636 23.9
r4 -18.39 d5 0.22
* r5 -22.78 d6 2.62 1.535 55.7
r6 -11.84 d7 0.22
r7 105.20 d8 3.87 1.535 55.7
* r8 -13.85 d9 Variable
r9 0.00 d10 0.80 1.492 57.4
r10 0.00 d11 21.00
EP
Aspherical coefficient k C2 C4 C6 C8
r2 0.00E + 00 0.00E + 00 1.57E-04 8.64E-07 0.00E + 00
r3 -7.62E-01 0.00E + 00 8.52E-05 0.00E + 00 0.00E + 00
r5 0.00E + 00 0.00E + 00 -7.94E-05 0.00E + 00 0.00E + 00
r8 0.00E + 00 0.00E + 00 1.27E-04 -3.08E-07 3.21E-09
Variable interval diopter [dpt] 0 -3 +1 -1
d1 7.10 6.25 7.35 6.83
d9 1.05 1.90 0.80 1.32
[Numerical data 5]
Overall focal length Image display surface Diagonal length 2ω [°]
25.22 16.8 35.1
Lens data Paraxial radius of curvature Axis top spacing Refractive index (Nd) Abbe number (νd)
r0 display panel d1 variable
r1 49.56 d2 6.43 1.535 55.7
* r2 -17.25 d3 4.39
* r3 -8.84 d4 1.95 1.636 23.9
r4 -30.05 d5 0.22
r5 266.69 d6 5.26 1.531 55.9
r6 -27.75 d7 0.22
r7 235.81 d8 5.82 1.535 55.7
* r8 -18.98 d9 Variable
r9 0.00 d10 0.80 1.492 57.4
r10 0.00 d11 30.00
EP
Aspherical coefficient k C2 C4 C6
r1 0.00E + 00 0.00E + 00 2.91E-05 0.00.E + 00
r2 -1.33E + 00 0.00E + 00 -1.12E-04 0.00.E + 00
r8 -2.17E + 00 0.00E + 00 1.01E-05 1.04E-08
Variable interval diopter [dpt] 0 -3 +1 -1
d1 10.39 8.38 11.02 9.74
d9 2.04 4.05 1.41 2.69
[Numerical data 6]
Overall focal length Image display surface Diagonal length 2ω [°]
20.46 12.6 33.1
Lens data Paraxial radius of curvature Axis top spacing Refractive index (Nd) Abbe number (νd)
r0 display panel d1 variable
r1 59.97 d2 5.95 1.694 53.2
* r2 -11.68 d3 2.38
* r3 -6.74 d4 1.67 1.636 23.9
r4 -28.97 d5 0.00
r5 -28.97 d6 3.09 1.535 56.0
r6 -35.80 d7 0.25
r7 61.73 d8 5.49 1.535 56.0
* r8 -12.03 d9 Variable
r9 0.00 d10 0.80 1.492 57.4
r10 0.00 d11 24.00
EP
Aspherical coefficient
k C2 C4 C6
r2 0.00E + 00 0.00E + 00 1.15E-04 2.75E-07
r3 -9.93E-01 0.00E + 00 0.00E + 00 0.00E + 00
r8 -5.80E-01 0.00E + 00 6.48E-05 8.67E-08
Variable interval diopter [dpt] 0 -3 +1 -1
d1 9.47 8.06 9.85 9.01
d9 0.87 2.28 0.50 1.34
Ｌ０ 接眼光学系 Ｌ１ 第１レンズ Ｌ２ 第２レンズ Ｌ３ 第３レンズ
Ｌ４ 第４レンズ ＩＰ 画像表示面 ＥＰ 観察面
L0 Eyepiece optical system L1 1st lens L2 2nd lens L3 3rd lens L4 4th lens IP image display surface EP observation surface
Claims (12)
前記第１レンズ乃至前記第４レンズの各レンズの材料のｄ線における屈折率の平均値をＮｄａ、前記第１レンズの観察側のレンズ面の曲率半径をＬ１Ｒ２、前記第２レンズの物体側のレンズ面の曲率半径をＬ２Ｒ１、前記第３レンズと前記第４レンズの合成焦点距離をｆ３４、前記接眼光学系の焦点距離をｆ、前記第１レンズと前記第２レンズの光軸上の間隔をｄ３、前記第２レンズと前記第３レンズの光軸上の間隔をｄ５とするとき、
１．５５９≦Ｎｄａ≦１．７３０
−５．２≦（Ｌ２Ｒ１＋Ｌ１Ｒ２）／（Ｌ２Ｒ１−Ｌ１Ｒ２）≦０．０
０．６８≦ｆ３４／ｆ≦１．２５
０．００≦ｄ５／ｄ３≦０．７５
なる条件式を満たすことを特徴とする接眼光学系。 An eyepiece optical system composed of a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens, and a fourth lens having a positive refractive power, which are arranged in order from the object side to the observation side. hand,
The average value of the refractive index of the material of each lens of the first lens to the fourth lens in the d line is Nda, the radius of curvature of the lens surface on the observation side of the first lens is L1R2, and the object side of the second lens. The radius of curvature of the lens surface is L2R1, the combined focal distance between the third lens and the fourth lens is f34, the focal distance of the eyepiece optical system is f, and the distance between the first lens and the second lens on the optical axis. d3, when the distance between the second lens and the third lens on the optical axis is d5,
1.559 ≤ Nda ≤ 1.730
- 5.2 ≦ (L2R1 + L1R2) / (L2R1-L1R2) ≦ 0.0
0.68 ≤ f34 / f ≤ 1.25
0.00≤d5 / d3≤0.75
An eyepiece optical system characterized by satisfying the conditional expression.
０．０≦ｄ５／ｄ３≦０．６
なる条件式を満足することを特徴とする請求項１に記載の接眼光学系。 0.80 ≦ f34 / f ≦ 1.25
0.0 ≤ d5 / d3 ≤ 0.6
The eyepiece optical system according to claim 1, wherein the conditional expression is satisfied.
前記第１レンズ乃至前記第４レンズの各レンズの材料のｄ線における屈折率の平均値をＮｄａ、前記第１レンズの観察側のレンズ面の曲率半径をＬ１Ｒ２、前記第２レンズの物体側のレンズ面の曲率半径をＬ２Ｒ１、前記第３レンズと前記第４レンズの合成焦点距離をｆ３４、前記接眼光学系の焦点距離をｆ、前記第１レンズと前記第２レンズの光軸上の間隔をｄ３、前記第２レンズと前記第３レンズの光軸上の間隔をｄ５とするとき、
１．５２０≦Ｎｄａ≦１．７３０
−５．２≦（Ｌ２Ｒ１＋Ｌ１Ｒ２）／（Ｌ２Ｒ１−Ｌ１Ｒ２）≦０．０
０．７７≦ｆ３４／ｆ≦１．３０
０．００≦ｄ５／ｄ３≦０．７５
なる条件式を満たすことを特徴とする接眼光学系。 An eyepiece optical system composed of a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens, and a fourth lens having a positive refractive power, which are arranged in order from the object side to the observation side. hand,
The average value of the refractive index of the material of each lens of the first lens to the fourth lens in the d line is Nda, the radius of curvature of the lens surface on the observation side of the first lens is L1R2, and the object side of the second lens. The radius of curvature of the lens surface is L2R1, the combined focal distance between the third lens and the fourth lens is f34, the focal distance of the eyepiece optical system is f, and the distance between the first lens and the second lens on the optical axis. d3, when the distance between the second lens and the third lens on the optical axis is d5,
1.520 ≤ Nda ≤ 1.730
-5.2 ≤ (L2R1 + L1R2) / (L2R1-L1R2) ≤ 0.0
0.77 ≦ f34 / f ≦ 1.30
0.00≤d5 / d3≤0.75
An eyepiece optical system characterized by satisfying the conditional expression.
なる条件式を満足することを特徴とする請求項３に記載の接眼光学系。 0.0 ≤ d5 / d3 ≤ 0.6
The eyepiece optical system according to claim 3 , wherein the conditional expression is satisfied.
０．２５＜ＰＮ／ｆ＜０．５５
なる条件式を満たすことを特徴とする請求項１０に記載の観察装置。 When half of the diagonal length of the image display surface of the image display element is PN,
0.25 <PN / f <0.55
The observation device according to claim 10 , wherein the observation device satisfies the conditional expression.
０．０≦ｄ１／ｆ＜０．８
なる条件式を満たすことを特徴とする請求項１０又は１１に記載の観察装置。 When the distance on the optical axis from the image display surface to the lens surface on the image display surface side of the first lens is d1
0.0 ≦ d1 / f <0.8
The observation device according to claim 10 or 11 , wherein the observation device satisfies the conditional expression.
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| CN111694147B (en) * | 2020-06-24 | 2023-12-08 | 深圳珑璟光电科技有限公司 | Eyepiece lens and eyepiece optical system |
| JP2020181222A (en) * | 2020-08-12 | 2020-11-05 | 富士フイルム株式会社 | Eyepiece and imaging apparatus |
| JP2022036848A (en) | 2020-08-24 | 2022-03-08 | キヤノン株式会社 | Observation optical system and imaging device equipped therewith |
| CN112630977A (en) * | 2020-12-31 | 2021-04-09 | 深圳纳德光学有限公司 | Large-field-angle eyepiece optical system and head-mounted display device |
| CN114384678B (en) * | 2022-03-24 | 2022-07-29 | 浙江华诺康科技有限公司 | Objective lens for endoscope and endoscope |
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| JPS61285418A (en) * | 1985-06-13 | 1986-12-16 | Asahi Optical Co Ltd | Ocular lens |
| JPH05313073A (en) * | 1991-04-16 | 1993-11-26 | Olympus Optical Co Ltd | Eyepiece for endoscope |
| JPH11133316A (en) * | 1997-10-31 | 1999-05-21 | Sony Corp | Ocular and virtual image providing device |
| JP2002048985A (en) * | 2000-08-02 | 2002-02-15 | Minolta Co Ltd | Eyepiece optical system |
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