JP2019128527A - Observation device - Google Patents
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本発明は、観察装置に関する。 The present invention relates to an observation apparatus.
従来、電子ビューファインダー（観察装置）においては、液晶画面等の画像表示素子に表示され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。 Conventionally, in an electronic view finder (observation apparatus), an eyepiece optical system is used to magnify and observe an image displayed on an image display element such as a liquid crystal screen.
この接眼光学系には、画像表示面の視認性を高めるために、十分に広い視野角（高い観察倍率）と、十分に長いアイレリーフ（観察側のレンズ面からアイポイントまでの距離）、収差が良好に補正された高い光学性能を有すること等が要望されている。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１０もｍｍ〜２０ｍｍ）であることが要求されている。 This eyepiece optical system has a sufficiently wide viewing angle (high observation magnification), sufficiently long eye relief (distance from the lens surface on the observation side to the eye point), and aberrations to improve the visibility of the image display surface. Therefore, there is a demand for high optical performance that is well corrected. Furthermore, from the demand for miniaturization of the observation device, it is required that the image display element used for the observation device has a small size (for example, 10 mm to 20 mm in diagonal length).
従来、観察視野角の大きい接眼光学系が種々と提案されている（特許文献１、２）。特許文献１では画像表示面側より観察側に向かって、正の屈折力の第１レンズ、画像表示面側に凹面を向けたメニスカス形状の負の屈折力の第２レンズ、正の屈折力の第３レンズを有した接眼光学系を開示している。 Conventionally, various eyepiece optical systems having a large observation viewing angle have been proposed (Patent Documents 1 and 2). In Patent Document 1, a first lens having a positive refractive power from the image display surface side toward the observation side, a meniscus second lens having a negative refractive power with a concave surface facing the image display surface side, a positive refractive power An eyepiece optical system having a third lens is disclosed.
特許文献１では、第２レンズの焦点距離と、第１レンズと第２レンズの光軸上の間隔、第２レンズと第３レンズの光軸上の間隔、第１レンズの観察側のレンズ面の曲率半径、第２レンズの画像表示面側のレンズ面の曲率半径等を適切に設定している。これにより、視野角（観察視野角）が広く、各レンズの敏感度を軽減した高性能な接眼光学系を提案している。 In Patent Document 1, the focal length of the second lens, the distance on the optical axis of the first lens and the second lens, the distance on the optical axis of the second lens and the third lens, the lens surface on the observation side of the first lens And the radius of curvature of the lens surface on the image display surface side of the second lens are appropriately set. This proposes a high-performance eyepiece optical system with a wide viewing angle (observation viewing angle) and reduced sensitivity of each lens.
また、特許文献２では画像表示面側より観察側へ向かって、正の屈折力の第１レンズ、負の屈折力の第２レンズ、正の屈折力の第３レンズを有した接眼光学系を開示している。特許文献２では、第１レンズの焦点距離、第２レンズの焦点距離、全系の焦点距離を各々適切に設定することで、視野角が大きく像面湾曲、歪曲収差の諸収差を良好に補正した接眼光学系を提案している。 Further, in Patent Document 2, an eyepiece optical system having a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power from the image display surface side to the observation side. Disclosure. In Patent Document 2, by appropriately setting the focal length of the first lens, the focal length of the second lens, and the focal length of the entire system, the viewing angle is large and various aberrations such as field curvature and distortion are corrected well. Proposed an eyepiece optical system.
観察装置に用いられる接眼光学系において、視野角が広く、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有する画像表示素子を用いるときは、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 an eyepiece optical system used in an observation apparatus, in order to ensure a wide viewing angle 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 an image display element having a small image display surface is used, 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.
例えば全系の屈折力が弱くなると、広い視野角を得るのが困難になる。また、各レンズの屈折力配置が適切に配置されていないと、アイレリーフを長くするのが困難になる。また接眼光学系より離れて観察すると、観察視野の周辺で像が陰り易くなる。 For example, when the refractive power of the entire system becomes weak, it becomes difficult to obtain a wide viewing angle. Further, if the refractive power arrangement of each lens is not properly arranged, it is difficult to lengthen the eye relief. Further, when observing away from the eyepiece optical system, the image tends to be shaded around the observation visual field.
本発明は、画像表示面の画像を高い視野角で観察可能で、諸収差を良好に補正し高い光学性能を確保しつつ、長いアイポイントの確保が容易な観察装置の提供を目的としている。 An object of the present invention is to provide an observation apparatus that can observe an image on an image display surface with a high viewing angle, corrects various aberrations satisfactorily and ensures high optical performance, and easily secures a long eye point.
本発明の観察装置は、画像を表示する画像表示素子と、該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接眼光学系を有する観察装置において、
前記接眼光学系は、前記画像表示面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、正の屈折力の第３レンズを有し、
前記第１レンズの焦点距離をｆ１、前記第３レンズの焦点距離をｆ３、前記接眼光学系の焦点距離をｆ、前記画像表示面の対角線長の半分をＨとするとき、
０．３０５＜Ｈ／ｆ＜０．４４０
０．４８＜ｆ１／ｆ３＜１．２４
なる条件式を満足することを特徴としている。
An observation apparatus according to the present invention is an observation apparatus having an image display element for displaying an image and an eyepiece optical system for observing an image displayed on an image display surface of the image display element.
The eyepiece optical system includes a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power, which are arranged in order from the image display surface to the observation side.
When the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the eyepiece optical system is f, and half of the diagonal length of the image display surface is H,
0.305 <H / f <0.440
0.48 <f1 / f3 <1.24
It satisfies the following conditional expression.
本発明によれば、画像表示面の画像を高い視野角で観察可能で、諸収差を良好に補正し高い光学性能を確保しつつ、長いアイポイントの確保が容易な観察装置が得られる。 ADVANTAGE OF THE INVENTION According to this invention, the observation apparatus which can observe the image of an image display surface with a high viewing angle, correct | amends various aberrations favorably, and ensures high optical performance, and can ensure a long eyepoint easily is obtained.
以下、実施例にかかる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。本発明の観察装置は、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に表示される画像を観察する接眼光学系を有する。 Hereinafter, an eyepiece optical system according to an example and an observation apparatus having the same will be described. The observation apparatus of the present invention has an image display element for displaying an image and an eyepiece optical system for observing an image displayed on the image display surface of the image display element.
各実施例に係る接眼光学系は、画像表示面に表示された画像を観察する。接眼光学系は画像表示面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、正の屈折力の第３レンズを有する。第３レンズの観察側に正又は負の屈折力の第４レンズを有していても良い。 The eyepiece optical system according to each embodiment observes an image displayed on the image display surface. The eyepiece optical system includes a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power, which are arranged in order from the image display surface to the observation side. A fourth lens having positive or negative refractive power may be provided on the observation side of the third lens.
図１は実施例１の観察装置のレンズ断面図である。図２は本発明の実施例１に係る接眼光学系の視度が−１．０ディオプター（標準視度）における収差図である。 1 is a lens cross-sectional view of the observation apparatus of Example 1. FIG. FIG. 2 is an aberration diagram when the diopter of the eyepiece optical system according to Example 1 of the present invention is −1.0 diopter (standard diopter).
図３は実施例２の観察装置のレンズ断面図である。図４は実施例２に係る接眼光学系の視度が−１．０ディオプターにおける収差図である。 3 is a lens cross-sectional view of the observation apparatus of Example 2. FIG. FIG. 4 is an aberration diagram when the diopter of the eyepiece optical system according to Example 2 is −1.0 diopter.
図５は実施例３の観察装置のレンズ断面図である。図６は実施例３に係る接眼光学系の視度が−１．０ディオプターにおける収差図である。 FIG. 5 is a lens cross-sectional view of the observation apparatus of Example 3. FIG. 6 is an aberration diagram when the diopter of the eyepiece optical system according to Example 3 is −1.0 diopter.
図７は実施例４の観察装置のレンズ断面図である。図８は実施例４に係る接眼光学系の視度が−１．０ディオプターにおける収差図である。 FIG. 7 is a lens cross-sectional view of the observation apparatus of Example 4. FIG. 8 is an aberration diagram when the diopter of the eyepiece optical system according to Example 4 is −1.0 diopter.
図９は実施例５の観察装置のレンズ断面図である。図１０は実施例５に係る接眼光学系の視度が−１．０ディオプターにおける収差図である。 FIG. 9 is a lens cross-sectional view of the observation apparatus of the fifth embodiment. FIG. 10 is an aberration diagram when the diopter of the eyepiece optical system according to Example 5 is −1.0 diopter.
各実施例は、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。 Each embodiment is used in an electronic viewfinder (observation apparatus) of an imaging apparatus such as a digital camera or a video camera. In the lens cross-sectional view, the left side is the image display surface side, and the right side is the observation side (exit pupil side). In the lens sectional view, 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 or organic EL. 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Ｓ（実線）はｄ線のサジタル像面、Ｍ（破線）はｄ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。 Among the aberration diagrams, in the spherical 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, S (solid line) indicates a sagittal image plane of d-line, and M (broken line) indicates a meridional image plane of d-line. The distortion is shown for the d line. Lateral chromatic aberration is shown for the F-line. H is half of the diagonal length of the image display surface (maximum image height). The numerical value is a value when numerical data described later is expressed in mm.
画像表示素子の画像表示面の対角長が１０ｍｍ〜２５ｍｍの小型の画像表示面（表示パネル）を視野角が３０度〜４５度で拡大観察するためには、接眼光学系に強い正の屈折力（パワー）が必要である。さらに、アイレリーフを長くするためには、接眼光学系のＦナンバーを明るくする必要があり、そのためには、接眼光学系の光線有効範囲を広くする必要がある。 In order to enlarge and observe a small image display surface (display panel) having a diagonal length of 10 mm to 25 mm of the image display element at a viewing angle of 30 degrees to 45 degrees, positive refraction strong to the eyepiece optical system Power is necessary. Furthermore, in order to lengthen the eye relief, it is necessary to brighten the F-number of the eyepiece optical system. For this purpose, it is necessary to widen the effective ray range of the eyepiece optical system.
このようにすると接眼光学系より、球面収差、像面湾曲、非点収差、色収差が多く発生し、これらの諸収差の補正が難しくなる。このときの球面収差、像面湾曲、非点収差、色収差等の残存収差により、画像表示面の全体、特に画像表示面の周辺の観察の際の光学性能が低下してくる。 In this case, spherical aberration, curvature of field, astigmatism, and chromatic aberration occur more frequently than the eyepiece optical system, and it becomes difficult to correct these various aberrations. Due to residual aberrations such as spherical aberration, curvature of field, astigmatism, and chromatic aberration, the optical performance of the entire image display surface, particularly the periphery of the image display surface, is deteriorated.
このときの諸収差を改善するため、各実施例に係る接眼光学系Ｌ０では、次の構成を有している。画像表示面（物体面）ＩＰより観察面（アイポイント）ＥＰ側に順に配置した、正の屈折力の第１レンズＬ１と、負の屈折力の第２レンズＬ２と、正の屈折力の第３レンズＬ３を有するようにしている。 In order to improve the various aberrations at this time, the eyepiece optical system L0 according to each example has the following configuration. A first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, and a second lens having a positive refractive power, which are arranged in this order from the image display surface (object surface) IP to the observation surface (eye point) EP side. The three lenses L3 are provided.
尚、各実施例において好ましくは第３レンズの観察面側に正の屈折力の第４レンズを有するように構成しても良い。 In each embodiment, the fourth lens may preferably have a fourth lens having a positive refractive power on the observation surface side of the third lens.
各実施例において、接眼光学系Ｌ０は、視度調整機構を有する。各実施例において、第１レンズＬ１の焦点距離をｆ１、第３レンズＬ３の焦点距離をｆ３、接眼光学系Ｌ０の焦点距離をｆとする。画像表示面ＩＰの対角線長の半分をＨとする。 In each embodiment, the eyepiece optical system L0 has a diopter adjustment mechanism. In each embodiment, the focal length of the first lens L1 is f1, the focal length of the third lens L3 is f3, and the focal length of the eyepiece optical system L0 is f. Let H be the half of the diagonal length of the image display surface IP.
このとき、
０．３０５＜Ｈ／ｆ＜０．４４０ ・・・（１）
０．４８＜ｆ１／ｆ３＜１．２４ ・・・（２）
なる条件式を満足する。
At this time,
0.305 <H / f <0.440 (1)
0.48 <f1 / f3 <1.24 (2)
The following conditional expression is satisfied.
各実施例に係る接眼光学系は、前述の如く構成することにより、視野角が広く、アイレリーフが長く、かつ球面収差、像面湾曲、非点収差、色収差を始めとする諸収差が十分に補正された高い光学性能を得ている。 The eyepiece optical system according to each of the embodiments is configured as described above, so that wide viewing angles, long eye relief, and various aberrations including spherical aberration, curvature of field, astigmatism, and chromatic aberration are sufficiently obtained. It has high corrected optical performance.
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（１）は、画像表示面ＩＰの対角線長の半分（物体面の最大高さ）と接眼光学系の焦点距離の関係を規定している。広い視野角（観察視野角）と球面収差、像面湾曲、非点収差等の諸収差を補正するためのものである。 Next, technical meanings of the above-mentioned conditional expressions will be described. Conditional expression (1) defines the relationship between the half of the diagonal length of the image display surface IP (maximum height of the object surface) and the focal length of the eyepiece optical system. It is intended to correct a wide viewing angle (observation viewing angle) and various aberrations such as spherical aberration, field curvature, and astigmatism.
この条件式（１）の上限値を超えると、画像表示面ＩＰの最大高さの光線の光路を確保するために、接眼光学系Ｌ０の有効系が大きくなり各レンズのパワーバランスが低下する。かつ、画像表示面ＩＰの最大高さに対する接眼光学系Ｌ０の焦点距離が小さくなる。これらの理由から、球面収差、像面湾曲、非点収差等の諸収差の補正効果が不十分となる。この条件式（１）の下限値を越えると、画像表示面ＩＰの最大高さに対して、接眼光学系Ｌ０の焦点距離が大きくなりすぎ、視野角を広くすることが困難になる。 When the upper limit value of the conditional expression (1) is exceeded, the effective system of the eyepiece optical system L0 is increased to secure the optical path of the light beam having the maximum height on the image display surface IP, and the power balance of each lens is lowered. In addition, the focal length of the eyepiece optical system L0 with respect to the maximum height of the image display surface IP is reduced. For these reasons, the effect of correcting various aberrations such as spherical aberration, field curvature, and astigmatism is insufficient. If the lower limit of conditional expression (1) is exceeded, the focal length of the eyepiece optical system L0 becomes too large with respect to the maximum height of the image display surface IP, and it becomes difficult to widen the viewing angle.
条件式（２）は、第１レンズＬ１と第３レンズＬ３の焦点距離の比を規定する。条件式（２）は主に球面収差、像面湾曲、非点収差等の諸収差を良好に補正しつつ、広い視野角と長いアイレリーフを得るためのものである。 Conditional expression (2) defines the ratio of the focal lengths of the first lens L1 and the third lens L3. Conditional expression (2) is mainly for obtaining a wide viewing angle and a long eye relief while satisfactorily correcting various aberrations such as spherical aberration, field curvature, and astigmatism.
この条件式（２）の上限値を超えて、第１レンズＬ１の正のパワー（屈折力）が弱くなると、球面収差、像面湾曲、非点収差等の諸収差の補正が不十分となる。この条件式（２）の下限を越えて、第１レンズＬ１のパワーが強くなりすぎると、広い観察視野を確保しつつアイレリーフを長くすることが難しい。更に好ましくは条件式（１）、（２）の数値範囲を次の如く設定するのが良い。 If the upper limit of conditional expression (2) is exceeded and the positive power (refractive power) of the first lens L1 becomes weak, correction of various aberrations such as spherical aberration, field curvature, and astigmatism becomes insufficient. . If the lower limit of the conditional expression (2) is exceeded and the power of the first lens L1 becomes too strong, it is difficult to lengthen the eye relief while ensuring a wide observation field. More preferably, the numerical ranges of conditional expressions (1) and (2) are set as follows.
０．３０６＜Ｈ／ｆ＜０．４３５ ・・・（１ａ）
０．４９＜ｆ１／ｆ３＜１．２２ ・・・（２ａ）
0.306 <H / f <0.435 (1a)
0.49 <f1 / f3 <1.22 (2a)
第２レンズＬ２の画像表示面側のレンズ面の近軸曲率半径をｒ２１（ｍｍ）、第２レンズＬ２の観察側のレンズ面の近軸曲率半径をｒ２２（ｍｍ）とする。第１レンズＬ１の観察側のレンズ面の近軸曲率半径 をｒ１２（ｍｍ）、第１レンズＬ１と第２レンズＬ２の間隔をｄ１２（ｍｍ）とする。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。 The paraxial curvature radius of the lens surface on the image display surface side of the second lens L2 is r21 (mm), and the paraxial curvature radius of the lens surface on the observation side of the second lens L2 is r22 (mm). The paraxial radius of curvature of the observation side lens surface of the first lens L1 is r12 (mm), and the distance between the first lens L1 and the second lens L2 is d12 (mm). At this time, one or more of the following conditional expressions should be satisfied.
−４０．０＜（ｒ２１＋ｒ２２）／（ｒ２１−ｒ２２）＜−０．９ ・・・（３）
０．００（１／ｍｍ）＜（１／ｒ１２−１／ｒ２１＋ｄ１２／（ｒ１２×ｒ２１×３））＜０．１２（１／ｍｍ）
・・・（４）
後述する数値データにおいてはｒ２がｒ１２、ｒ３がｒ２１、ｒ４がｒ２２に相当する。
−40.0 <(r21 + r22) / (r21−r22) <− 0.9 (3)
0.00 (1 / mm) <(1 / r12-1 / r21 + d12 / (r12 × r21 × 3)) <0.12 (1 / mm)
... (4)
In numerical data to be described later, r2 corresponds to r12, r3 corresponds to r21, and r4 corresponds to r22.
次に前述の各条件式の技術的意味について説明する。 Next, technical meanings of the above-mentioned conditional expressions will be described.
条件式（３）は、第２レンズＬ２のレンズ形状を規定する。条件式（３）は、広い視野角と長いアイレリーフを確保しつつ、諸収差を良好に補正するためのものである。 Conditional expression (3) defines the lens shape of the second lens L2. Condition (3) is for correcting various aberrations well while securing a wide viewing angle and a long eye relief.
この条件式（３）の上限値を超えると、第２レンズＬ２のパワーバランスが低下し、アイレリーフが短くなる。この条件式（３）の下限値を超えると、第２レンズＬ２の観察側のレンズ面の曲率形状が急になり、球面収差、像面湾曲、非点収差等の諸収差の補正が困難となる。 If the upper limit value of the conditional expression (3) is exceeded, the power balance of the second lens L2 is lowered and the eye relief is shortened. If the lower limit value of the conditional expression (3) is exceeded, the curvature shape of the lens surface on the observation side of the second lens L2 becomes steep and it is difficult to correct various aberrations such as spherical aberration, curvature of field, astigmatism and the like. Become.
条件式（４）は、第１レンズＬ１と第２レンズＬ２の間で形状される空気レンズの負のパワーを規定している。条件式（４）は主に像面湾曲、非点収差、歪曲収差の諸収差を良好に補正しつつ、長いアイレリーフを確保するためのものである。 Conditional expression (4) defines the negative power of the air lens formed between the first lens L1 and the second lens L2. Conditional expression (4) is mainly for ensuring a long eye relief while satisfactorily correcting various aberrations such as field curvature, astigmatism, and distortion.
この条件式（４）の上限を超えると、空気レンズの負のパワーが強くなり過ぎる（負の屈折力の絶対値が大きくなりすぎる）ため、球面収差、像面湾曲、非点収差等の諸収差の補正が不十分となる。この条件式（４）の下限を越えると、空気レンズの負の屈折力が弱くなり（負の屈折力の絶対値が小さくなり）、空気レンズで光線が集光されるため、アイレリーフがみじかくなる。 If the upper limit of this conditional expression (4) is exceeded, the negative power of the air lens becomes too strong (the absolute value of the negative refractive power becomes too large), so various aberrations such as spherical aberration, field curvature, astigmatism, etc. Aberration correction is insufficient. When the lower limit of conditional expression (4) is exceeded, the negative refractive power of the air lens becomes weak (the absolute value of the negative refractive power becomes small), and light rays are collected by the air lens, so the eye relief is severe. Become.
更に好ましくは条件式（３）、（４）の数値範囲を次の如く設定するのが良い。 More preferably, the numerical ranges of conditional expressions (3) and (4) should be set as follows.
−３５．０＜（ｒ２１＋ｒ２２）／（ｒ２１−ｒ２２）＜−１．０ ・・・（３ａ）
０．００５＜（１／ｒ１２−１／ｒ２１＋ｄ１２／（ｒ１２×ｒ２１×３））
＜０．１００
・・・（４ａ）
-35.0 <(r21 + r22) / (r21-r22) <-1.0 (3a)
0.005 <(1 / r12-1 / r21 + d12 / (r12 × r21 × 3))
<0.100
... (4a)
以下に本発明の各実施例の接眼光学系に対応する数値データを示す。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。ｒ０は表示パネル（画像表示面）である。数値データ１、３乃至５においてｒ７、ｒ８はカバーガラス、数値データ２においてｒ９、ｒ１０はカバーガラスである。 Numerical data corresponding to the eyepiece optical system of each embodiment of the present invention will be shown below. In the order from the image display surface IP to the viewing side EP, “ri” indicates the paraxial radius of curvature of the i-th surface. r0 is a display panel (image display surface). In numerical data 1, 3 to 5, r7 and r8 are cover glasses, and in numerical data 2, r9 and r10 are cover glasses.
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。 di indicates an axial upper surface distance between the i-th surface and the (i + 1) -th surface in order from the image display surface IP. Further, Ndi represents the refractive index of the i-th material with respect to the d-line (wavelength = 578.6 nm), and νdi represents the Abbe number of the i-th material with respect to the d-line.
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、接眼光学系は、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 numerical data, the unit of length described is [mm] unless otherwise specified. However, since the eyepiece optical system can obtain the same optical performance even when proportionally enlarged or reduced, the unit is not limited to [mm], and other appropriate units can be used. In the numerical data, the surface on which the suffix “*” is written in the paraxial radius of curvature field is an aspheric shape defined by the following equation (1).
なお、（数１）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、c8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。各数値データにおける前述の各条件式の計算結果を表１に示す。 In equation (1), x is the distance in the optical axis direction from the vertex of the lens surface, h is the height in the direction perpendicular to the optical axis, R is the paraxial radius of curvature at the vertex of the lens surface, k is the cone The constants c2, c4, c6, and c8 are polynomial coefficients. In the aspheric coefficient, “E−i” represents an exponential expression with 10 as the base, that is, “10 −i ”. Table 1 shows the calculation result of each conditional expression described above for each numerical data.
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。 As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.
Ｌ０ 接眼レンズ Ｌ１ 第１レンズ Ｌ２ 第２レンズ
Ｌ３ 第３レンズ Ｌ４ 第４レンズ
L0 eyepiece lens L1 first lens L2 second lens L3 third lens L4 fourth lens
Claims (5)
前記接眼光学系は、前記画像表示面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、正の屈折力の第３レンズを有し、
前記第１レンズの焦点距離をｆ１、前記第３レンズの焦点距離をｆ３、前記接眼光学系の焦点距離をｆ、前記画像表示面の対角線長の半分をＨとするとき、
０．３０５＜Ｈ／ｆ＜０．４４０
０．４８＜ｆ１／ｆ３＜１．２４
なる条件式を満足することを特徴とする観察装置。 In an observation apparatus having an image display element for displaying an image and an eyepiece optical system for observing an image displayed on the image display surface of the image display element,
The eyepiece optical system includes a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power, which are arranged in order from the image display surface to the observation side.
When the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the eyepiece optical system is f, and half of the diagonal length of the image display surface is H,
0.305 <H / f <0.440
0.48 <f1 / f3 <1.24
An observation apparatus that satisfies the following conditional expression:
−４０．０＜（ｒ２１＋ｒ２２）／（ｒ２１−ｒ２２）＜−０．９
なる条件式を満足することを特徴とする請求項１に記載の観察装置。 Assuming that the paraxial radius of curvature of the lens surface on the image display surface side of the second lens is r21 and the radius of paraxial curvature of the lens surface on the observation side of the second lens is r22,
−40.0 <(r21 + r22) / (r21−r22) <− 0.9
The observation apparatus according to claim 1, wherein the following conditional expression is satisfied.
０．００（１／ｍｍ）＜（１／ｒ１２−１／ｒ２１＋ｄ１２／（ｒ１２×ｒ２１×３））＜０．１２（１／ｍｍ）
なる条件式を満足することを特徴とする請求項１または２に記載の観察装置。 The paraxial curvature radius of the lens surface on the observation side of the first lens is r12 (mm), the paraxial curvature radius of the lens surface on the image display surface side of the second lens is r21 (mm), and the observation of the first lens When the distance on the optical axis between the lens surface on the side and the lens surface on the image display surface side of the second lens is d12 (mm),
0.00 (1 / mm) <(1 / r12-1 / r21 + d12 / (r12 × r21 × 3)) <0.12 (1 / mm)
The observation apparatus according to claim 1, wherein the following conditional expression is satisfied.
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| JP7374688B2 (en) | 2019-09-27 | 2023-11-07 | キヤノン株式会社 | image display device |
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