JP6195345B2 - Eyepiece optical system, electronic viewfinder, and imaging device - Google Patents
Eyepiece optical system, electronic viewfinder, and imaging device Download PDFInfo
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本発明は、電子ビューファインダに好適な接眼光学系に関する。 The present invention relates to an eyepiece optical system suitable for an electronic viewfinder.
従来から、小型表示パネルを観察するための接眼光学系が提案されている。このような接眼光学系として、物体側（表示パネル側）から像側（観察側）に順に、正レンズ、負レンズ、および、正レンズの３枚のレンズで構成された接眼光学系が知られている。 Conventionally, an eyepiece optical system for observing a small display panel has been proposed. As such ocular optical system, in order from the object side (the display panel side) to the image side (observation side), a positive lens, a negative lens, and an eyepiece optical system composed of three lenses of a positive lens is known It has been.
特許文献１には、物体側から像側に順に、正の屈折力を有して物体側に凹面を向けたメニスカスレンズ、負の屈折力を有して物体側に凹面を向けたメニスカスレンズ、および、正の屈折力を有するレンズの３枚構成の接眼光学系が開示されている。特許文献２には、物体側から像側に順に、両凸レンズ、負の屈折力を有して物体側に凹面を向けたレンズ、および、正の屈折力を有して像側に凸面を向けたレンズの３枚構成の接眼光学系が開示されている。 In Patent Document 1, in order from the object side to the image side, a meniscus lens having a positive refractive power and a concave surface directed toward the object side, a meniscus lens having a negative refractive power and directed a concave surface toward the object side, In addition, an eyepiece optical system having a three-lens configuration of lenses having positive refractive power is disclosed. In Patent Document 2, in order from the object side to the image side, a biconvex lens, a lens having a negative refractive power and a concave surface facing the object side, and a convex surface facing the image side having a positive refractive power are directed. An eyepiece optical system having a three-lens configuration is disclosed.
しかしながら、特許文献１の構成では、視度調節時に第１レンズ群と第２レンズ群との間隔が変化するため、像面湾曲が大きく変動して性能が劣化してしまう。この点は、特に、視野角を大きくするために各レンズのパワーを上げる設計において顕著となる。特許文献２の構成においても、視野角を大きくするため各レンズのパワーを上げるように設計すると、最も物体側の面の曲率が急であるため、この面に起因する歪曲収差および像面湾曲の補正が不十分となる。また、各レンズの間隔が狭いため、各レンズの平行方向のズレや傾斜により生じる視度ズレ、すなわち偏芯敏感度が大きくなる。 However, in the configuration of Patent Document 1, since the distance between the first lens group and the second lens group changes during diopter adjustment, the field curvature greatly fluctuates and the performance deteriorates. This is particularly noticeable in designs that increase the power of each lens in order to increase the viewing angle. Even in the configuration of Patent Document 2, if the power of each lens is increased to increase the viewing angle, the curvature of the surface closest to the object side is steep. Correction is insufficient. In addition, since the distance between the lenses is narrow, the diopter deviation, that is, the eccentricity sensitivity caused by the deviation or inclination of each lens in the parallel direction increases.
そこで本発明は、高視野角で高性能な接眼光学系、電子ビューファインダ、および、撮像装置を提供する。 Therefore, the present invention provides a high-performance eyepiece optical system, an electronic viewfinder, and an imaging device with a high viewing angle.
本発明の一側面としての接眼光学系は、物体側から観察側へ順に配置された、正の屈折力を有する第１のレンズ、負の屈折力を有し、物体側に凹面を向けたメニスカス形状の第２のレンズ、正の屈折力を有する第３のレンズから構成される接眼光学系であって、前記第１のレンズの焦点距離をｆ１、前記第２のレンズの焦点距離をｆ２、全系の焦点距離をｆ、前記第１のレンズと前記第２のレンズの光軸上の間隔をｄ１２、前記第２のレンズと前記第３のレンズの光軸上の間隔をｄ２３、前記第１のレンズの観察側のレンズ面の近軸曲率半径をｒ１２、前記第２のレンズの物体側のレンズ面の近軸曲率半径をｒ２１とするとき、所定の条件式を満たす。 An eyepiece optical system according to one aspect of the present invention includes a first lens having a positive refractive power and a meniscus having a negative refractive power and a concave surface facing the object side, which are arranged in order from the object side to the observation side. An eyepiece optical system including a second lens having a shape and a third lens having a positive refractive power, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, The focal length of the entire system is f, the distance on the optical axis between the first lens and the second lens is d12, the distance on the optical axis between the second lens and the third lens is d23, When the paraxial radius of curvature of the lens surface on the observation side of the first lens is r12 and the paraxial radius of curvature of the lens surface on the object side of the second lens is r21, a predetermined conditional expression is satisfied.
本発明の他の側面としての電子ビューファインダは、表示素子と、前記接眼光学系とを有する。 An electronic viewfinder as another aspect of the present invention includes a display element and the eyepiece optical system.
本発明の他の側面としての撮像装置は、前記電子ビューファインダを有する。 An imaging apparatus as another aspect of the present invention includes the electronic viewfinder.
本発明の他の目的及び特徴は、以下の実施例において説明される。 Other objects and features of the present invention are illustrated in the following examples.
本発明によれば、高視野角で高性能な接眼光学系、電子ビューファインダ、および、撮像装置を提供することができる。 According to the present invention, it is possible to provide an eyepiece optical system, an electronic viewfinder, and an imaging apparatus that have a high viewing angle and high performance.
以下、本発明の実施形態について、図面を参照しながら詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
対角長が１０ｍｍ〜１５ｍｍの小型の表示パネルを３０度以上の視野角で拡大観察するには、強い正の屈折力を有する接眼光学系が必要である。このような接眼光学系に対して、像面湾曲や歪曲収差などの諸収差を適切に補正することは困難である。このような像面湾曲や歪曲収差などの諸収差の影響により、パネル周辺像の光学性能は低下する。また、各レンズには、強い正の屈折力および負の屈折力が必要である。このため、各レンズの平行方向のズレまたは各レンズの傾斜により生じる視度ズレ、すなわち偏芯敏感度が大きくなる傾向にある。そこで、像面湾曲、歪曲収差、および、偏芯敏感度を改善する（低減する）ため、本実施形態の接眼光学系は、物体側から射出側（観察側）に順に、第１のレンズＬ１、第２のレンズＬ２、および、第３のレンズＬ３から構成される。第１のレンズＬ１は、正の屈折力を有するレンズからなる。第２のレンズＬ２は、物体側に凹面を向けた負の屈折力を有するメニスカスレンズからなる。第３のレンズＬ３は、正の屈折力を有するレンズからなる。 In order to enlarge and observe a small display panel having a diagonal length of 10 mm to 15 mm with a viewing angle of 30 degrees or more, an eyepiece optical system having a strong positive refractive power is required. For such an eyepiece optical system, it is difficult to appropriately correct various aberrations such as field curvature and distortion. The optical performance of the peripheral image of the panel deteriorates due to the influence of various aberrations such as curvature of field and distortion. Each lens requires a strong positive refractive power and a negative refractive power. For this reason, there is a tendency that the diopter shift, that is, the eccentricity sensitivity, caused by the shift of each lens in the parallel direction or the tilt of each lens increases. Therefore, in order to improve (reduce) the curvature of field, distortion, and decentering sensitivity, the eyepiece optical system of the present embodiment is arranged in order from the object side to the exit side (observation side). , The second lens L2, and the third lens L3. The first lens L1 is a lens having a positive refractive power. The second lens L2 is a meniscus lens having negative refractive power with a concave surface facing the object side. The third lens L3 is a lens having a positive refractive power.
図１および図２は、それぞれ、本発明の実施例１における接眼光学系のレンズ構成を示す断面図および諸収差（球面収差、非点収差、歪曲、色収差）を示す図である。図３および図４は、実施例２における接眼光学系のレンズ構成を示す断面図および諸収差を示す図である。図５および図６は、実施例３における接眼光学系のレンズ構成を示す断面図および諸収差を示す図である。図７および図８は、実施例４における接眼光学系のレンズ構成を示す断面図および諸収差を示す図である。 FIGS. 1 and 2 are a cross-sectional view and a diagram showing various aberrations (spherical aberration, astigmatism, distortion, chromatic aberration) showing the lens configuration of the eyepiece optical system in Example 1 of the present invention, respectively. 3 and 4 are a cross-sectional view showing the lens configuration of the eyepiece optical system in Example 2 and various aberrations. 5 and 6 are a cross-sectional view showing the lens configuration of the eyepiece optical system in Example 3 and diagrams showing various aberrations. 7 and 8 are a cross-sectional view showing the lens configuration of the eyepiece optical system in Example 4 and diagrams showing various aberrations.
図９は、実施例１〜４において、各レンズをｘ軸方向に０．１ｍｍだけ平行偏芯させた場合とｙ軸を回転軸として３０分だけ傾斜させた場合の視野左右端の視度ずれ量（偏芯敏感度）の絶対値を示す図である。図１０は、実施例１〜４において、各レンズをｙ軸方向に０．１ｍｍだけ平行偏芯させた場合とｘ軸を回転軸として３０分だけ傾斜させた場合の視野上下端の視度ずれ量（偏芯敏感度）の絶対値を示す図である。 FIG. 9 shows diopter shifts at the left and right ends of the visual field in Examples 1 to 4 when each lens is decentered by 0.1 mm in the x-axis direction and tilted by 30 minutes about the y-axis as a rotation axis. It is a figure which shows the absolute value of quantity (eccentricity sensitivity). FIG. 10 shows diopter shifts at the upper and lower ends of the visual field in Examples 1 to 4 when each lens is decentered by 0.1 mm in the y-axis direction and tilted by 30 minutes about the x-axis as a rotation axis. It is a figure which shows the absolute value of quantity (eccentricity sensitivity).
各収差図および偏芯敏感度を示す図においては、ファインダー視度が−１ディオプター（標準視度）である場合を示している。また、各レンズ構成を示す断面図において、左側が物体側（液晶表示素子ＬＣＤ側）、右側が射出側（観察側）である。 In each aberration diagram and the diagram showing the eccentricity sensitivity, a case where the finder diopter is −1 diopter (standard diopter) is shown. Further, in the cross-sectional views showing respective lens configuration, the left side is the object side (the liquid crystal display element LCD side), a right exit side (observation side).
各実施例の接眼光学系は、物体側から射出側（観察側）に順に、第１のレンズＬ１、第２のレンズＬ２、および、第３のレンズＬ３を備えて構成される。第１のレンズＬ１は、正の屈折力を有する単レンズである。第２のレンズＬ２は、負の屈折力を有し、物体側に凹面を向けたメニスカス形状の単レンズである。第３のレンズＬ３は、正の屈折力を有する単レンズである。また、液晶表示素子ＬＣＤの表示パネル面（接眼光学系の物体側）には、カバーガラスＣ０が設けられている。接眼光学系の射出側（観察側）には、射出窓部材Ｃ４が設けられている。各断面図において、ＥＰはアイポイント（仮想絞り）である。また、ｒｉ（ｉ＝１〜１１）は焦点面を基準として物体側からｉ番目の面の近軸曲率半径、ｄｉ（ｉ＝１〜１０）は物体側からｉ番目の面とｉ＋１番目の面との間の軸上面間隔である。各収差図において、ｄ、Ｆはそれぞれｄ線、Ｆ線である。ΔＭ、ΔＳは、それぞれメリディオナル像面、サジタル像面である。 The eyepiece optical system of each embodiment includes a first lens L1, a second lens L2, and a third lens L3 in order from the object side to the emission side (observation side) . The first lens L1 is a single lens having a positive refractive power. The second lens L2 is a meniscus single lens having negative refractive power and having a concave surface facing the object side. The third lens L3 is a single lens having a positive refractive power. A cover glass C0 is provided on the display panel surface of the liquid crystal display element LCD (the object side of the eyepiece optical system). An exit window member C4 is provided on the exit side (observation side) of the eyepiece optical system. In each sectional view, EP is an eye point (virtual stop). Also, ri (i = 1 to 11) is the paraxial radius of curvature of the i-th surface from the object side with reference to the focal plane, and di (i = 1 to 10) is the i-th surface and i + 1-th surface from the object side. The distance between the upper surface of the shaft. In each aberration diagram, d and F are a d-line and an F-line, respectively. ΔM and ΔS are a meridional image plane and a sagittal image plane, respectively.
各実施例の接眼光学系において、第２のレンズＬ２の焦点距離をｆ２、第１のレンズＬ１と第２のレンズＬ２の光軸ＯＡ上（光軸上）の間隔をｄ１２、第２のレンズＬ２と第３のレンズＬ３の光軸ＯＡ上の間隔をｄ２３とする。このとき、各実施例の接眼光学系は、以下の条件式（１）を満たす。 In the eyepiece optical system of each example, the focal length of the second lens L2 is f2, the distance between the first lens L1 and the second lens L2 on the optical axis OA (on the optical axis) is d12, and the second lens. The distance between L2 and the third lens L3 on the optical axis OA is d23. At this time, the eyepiece optical system of each example satisfies the following conditional expression (1).
−０．５０＜(ｄ１２＋ｄ２３)／ｆ２＜−０．３０ …（１）
より好ましくは、各実施例の接眼光学系は、以下の条件式（１ａ）を満たす。
−0.50 <(d12 + d23) / f2 <−0.30 (1)
More preferably, the eyepiece optical system of each embodiment satisfies the following conditional expression (1a).
−０．４７＜(ｄ１２＋ｄ２３)／ｆ２＜−０．３８ …（１ａ）
また、各実施例の接眼光学系において、第１のレンズＬ１の射出側（観察側）の面の近軸曲率半径をｒ１２、第２のレンズＬ２の物体側の面の近軸曲率半径をｒ２１とする。このとき、各実施例の接眼光学系は、以下の条件式（２）を満たす。
−0.47 <(d12 + d23) / f2 <−0.38 (1a)
In the eyepiece optical system of each example, the paraxial radius of curvature of the exit side (observation side) surface of the first lens L1 is r12, and the paraxial radius of curvature of the object side surface of the second lens L2 is r21. And At this time, the eyepiece optical system of each example satisfies the following conditional expression (2).
−６．１＜（ｒ２１＋ｒ１２）／（ｒ２１−ｒ１２）＜−４．０ …（２）
より好ましくは、各実施例の接眼光学系は、以下の条件式（２ａ）を満たす。
−6.1 <(r21 + r12) / (r21−r12) <− 4.0 (2)
More preferably, the eyepiece optical system of each embodiment satisfies the following conditional expression (2a).
−５．８＜（ｒ２１＋ｒ１２）／（ｒ２１−ｒ１２）＜−４．５ …（２ａ）
また、各実施例の接眼光学系において、第２のレンズＬ２の物体側の面の近軸曲率半径をｒ２１、第２のレンズＬ２の射出側（観察側）の面の近軸曲率半径をｒ２２とする。このとき、各実施例の接眼光学系は、以下の条件式（３）を満たすことが好ましい。
−5.8 <(r21 + r12) / (r21−r12) <− 4.5 (2a)
In the eyepiece optical system of each example, the paraxial radius of curvature of the object side surface of the second lens L2 is r21, and the paraxial radius of curvature of the exit side (observation side) surface of the second lens L2 is r22. And At this time, the eyepiece optical system of each example preferably satisfies the following conditional expression (3).
１．０＜（ｒ２２＋ｒ２１）／（ｒ２２−ｒ２１）＜２．０ …（３）
更に好ましくは、各実施例の接眼光学系は、以下の条件式（３ａ）を満たす。
1.0 <(r22 + r21) / (r22-r21) <2.0 (3)
More preferably, the eyepiece optical system of each example satisfies the following conditional expression (3a).
１．１＜（ｒ２２＋ｒ２１）／（ｒ２２−ｒ２１）＜１．９５ …（３ａ）
また、各実施例の接眼光学系において、第１のレンズＬ１の物体側の面の近軸曲率半径をｒ１１、第１のレンズＬ１の射出側（観察側）の面の近軸曲率半径をｒ１２とする。このとき、各実施例の接眼光学系は、以下の条件式（４）を満たすことが好ましい。
1.1 <(r22 + r21) / (r22−r21) <1.95 (3a)
In the eyepiece optical system of each example, the paraxial radius of curvature of the object side surface of the first lens L1 is r11, and the paraxial radius of curvature of the exit side (observation side) surface of the first lens L1 is r12. And At this time, the eyepiece optical system of each example preferably satisfies the following conditional expression (4).
−１．６＜（ｒ１２＋ｒ１１）／（ｒ１２−ｒ１１）＜−０．８ …（４）
更に好ましくは、各実施例の接眼光学系は、以下の条件式（４ａ）を満たす。
−1.6 <(r12 + r11) / (r12−r11) <− 0.8 (4)
More preferably, the eyepiece optical system of each example satisfies the following conditional expression (4a).
−１．４＜（ｒ１２＋ｒ１１）／（ｒ１２−ｒ１１）＜−０．９ …（４ａ）
また、第１のレンズＬ１の焦点距離をｆ１、全系の焦点距離をｆとするとき、各実施例の接眼光学系は、以下の条件式（５）を満たすことが好ましい。
−1.4 <(r12 + r11) / (r12−r11) <− 0.9 (4a)
Further, when the focal length of the first lens L1 is f1 and the focal length of the entire system is f, the eyepiece optical system of each embodiment preferably satisfies the following conditional expression (5).
０．８＜ｆ１／ｆ＜１．２ …（５）
更に好ましくは、各実施例の接眼光学系は、以下の条件式（５ａ）を満たす。
0.8 <f1 / f <1.2 (5)
More preferably, the eyepiece optical system of each example satisfies the following conditional expression (5a).
０．９＜ｆ１／ｆ＜１．１ …（５ａ）
各実施例によれば、以上の各条件式を満たすことにより、視野角が大きく、像面湾曲や非点収差などの諸収差が補正され、かつ、レンズの偏芯敏感度が低減された接眼光学系を提供することができる。
0.9 <f1 / f <1.1 (5a)
According to each embodiment, by satisfying the above conditional expressions, the eyepiece has a large viewing angle, various aberrations such as field curvature and astigmatism are corrected, and the decentration sensitivity of the lens is reduced. An optical system can be provided.
次に、各条件式の技術的意味について説明する。 Next, the technical meaning of each conditional expression will be described.
条件式（１）は、各レンズの光軸ＯＡ上の間隔と第２のレンズＬ２の焦点距離を規定しており、大きな視野角を確保しつつレンズの偏芯敏感度を低減するのに必要な条件を表している。条件式（１）の上限値を超えると、各レンズが接近しすぎるため、敏感度が大きくなる。一方、条件式（１）の下限値を超えると、光学系（接眼光学系）の大型化および視野角の低下を招く。 Conditional expression (1) defines the interval on the optical axis OA of each lens and the focal length of the second lens L2, and is necessary to reduce the eccentric sensitivity of the lens while ensuring a large viewing angle. It represents a difficult condition. When the upper limit value of conditional expression (1) is exceeded, each lens is too close, and the sensitivity increases. On the other hand, when the lower limit value of conditional expression (1) is exceeded, the optical system (eyepiece optical system) becomes large and the viewing angle decreases.
条件式（２）は、第１のレンズＬ１と第２のレンズＬ２との間の空気レンズの形状を規定しており、非点収差を低減しつつ第１のレンズＬ１および第２のレンズＬ２の偏芯敏感度を低減するための条件を表している。条件式（２）の上限値を超えると、非点収差の補正が不十分となる。一方、条件式（２）の下限値を超えると、各レンズの近軸曲率半径ｒ１２、ｒ２１が互いに近くなり、敏感度が大きくなる。 Conditional expression (2) defines the shape of the air lens between the first lens L1 and the second lens L2, and the first lens L1 and the second lens L2 while reducing astigmatism. This represents a condition for reducing the eccentric sensitivity. If the upper limit value of conditional expression (2) is exceeded, the correction of astigmatism will be insufficient. On the other hand, if the lower limit of conditional expression (2) is exceeded, the paraxial radii of curvature r12 and r21 of each lens become close to each other, and the sensitivity increases.
条件式（３）は、第２のレンズＬ２の形状を規定しており、第２のレンズＬ２の負のパワーを確保しつつ物体側の面の曲率を低減することにより、第２のレンズＬ２に起因する像面湾曲や歪曲収差の劣化を低減することができる。 Conditional expression (3) defines the shape of the second lens L2, and by reducing the curvature of the object side surface while ensuring the negative power of the second lens L2, the second lens L2 Degradation of field curvature and distortion due to the above can be reduced.
条件式（４）は、第１のレンズＬ１の形状を規定しており、第１のレンズＬ１の正のパワーを確保しつつ物体側の面の曲率を低減することにより、第１のレンズＬ１に起因する像面湾曲や歪曲収差の劣化を低減することができる。 Conditional expression (4) defines the shape of the first lens L1, and by reducing the curvature of the object side surface while ensuring the positive power of the first lens L1, the first lens L1. Degradation of field curvature and distortion due to the above can be reduced.
条件式（５）は、第１のレンズＬ１の焦点距離ｆ１と全系の焦点距離ｆとの比を規定しており、大きな視野角を確保しつつ、像面湾曲や歪曲収差などの諸収差を適切に補正するために必要な条件を表している。条件式（５）の範囲を外れると、像面湾曲や歪曲収差などの諸収差が劣化する。 Conditional expression (5) defines the ratio between the focal length f1 of the first lens L1 and the focal length f of the entire system, and various aberrations such as field curvature and distortion while ensuring a large viewing angle. This shows the conditions necessary to properly correct the. If the range of conditional expression (5) is not met, various aberrations such as field curvature and distortion will deteriorate.
以下、実施例１〜３のそれぞれに対応する数値実施例１〜３を示す。
各数値実施例において、ωは視度が−１ディオプター（標準視度）であるときの見かけ視野（半画角）である。また、ｒｉは焦点面を基準として物体側からｉ番目の面の近軸曲率半径、ｄｉは物体側からｉ番目の面とｉ＋１番目の面との間の軸上面間隔である。また、Ｎｉは物体側からｉ番目の硝材のｄ線（波長＝５７８．６ｎｍ）に対する屈折率、νｉは物体側からｉ番目の硝材のｄ線に対するアッベ数である。なお、表中では、記載されている長さの単位は、特記の無い場合、［ｍｍ］が用いられる。ただし、光学系（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ため、単位は［ｍｍ］に限定されることなく、他の単位を用いることができる。
Hereinafter, numerical examples 1 to 3 corresponding to the first to third examples will be described.
In each numerical example, ω is an apparent field of view (half angle of view) when the diopter is −1 diopter (standard diopter). Also, ri is the paraxial radius of curvature of the i-th surface from the object side with reference to the focal plane, and di is the axial upper surface distance between the i-th surface and the i + 1-th surface from the object side. Ni is the refractive index for the d-line (wavelength = 578.6 nm) of the i-th glass material from the object side, and νi is the Abbe number for the d-line of the i-th glass material from the object side. In the tables, [mm] is used as the unit of length described unless otherwise specified. However, since the optical system (eyepiece optical system) can obtain the same optical performance even when proportionally enlarged or reduced, the unit is not limited to [mm], and other units can be used.
各数値実施例において、近軸曲率半径の欄に非球面と記載されている面（「＊」が付されている面）は、以下の式（６）により定義される非球面形状を有する。 In each numerical example, a surface described as an aspheric surface in the paraxial curvature radius column (a surface marked with “*”) has an aspheric shape defined by the following equation (6).
式（６）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。また、各数値実施例において、「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 Expression (6), x is a distance in the optical axis direction from the apex of the lens surface, h is a height in a direction perpendicular to the optical axis, R is a paraxial radius of curvature at the apex of the lens surface, k is a conic constant, c 2 , c 4 , and c 6 are polynomial coefficients. In each numerical example, “E−i” represents an exponential expression with 10 as the base, that is, “10 −i ”.
また、表１に、各数値実施例に対応する条件式（１）〜（５）の値を示している。 Table 1 shows values of conditional expressions (1) to (5) corresponding to the respective numerical examples.
（数値実施例１）
全体諸元
焦点距離 画像表示面対角長 ω
23.61 12.70 30.80°
レンズデータ
近軸曲率半径 軸上面間隔 屈折率(Nd) アッベ数(νd)
r1 = ∞ d1 = 1.00 N0 = 1.52 ν0 = 64.14
r2 = ∞ d2 = 可変
r3 = ∞ d3 = 3.13 N1 = 1.57 ν1 = 56.36
r4* = -12.90 d4 = 3.73
r5* = -8.29 d5 = 1.80 N2 = 1.63 ν2 = 23.90
r6* = -36.48 d6 = 3.24
r7* = 59.06 d7 = 4.12 N3 = 1.57 ν3 = 56.36
r8* = -12.65 d8 = 可変
r9 = ∞ d9 = 1.00 N4 = 1.52 ν4 = 64.14
r10 = ∞ d10 = 18.00
r11 = ∞
非球面係数
k c2 c4 c6
r4* -3.32 0.00 -6.56E-05 2.66E-07
r5* -3.36E-01 0.00 1.08E-04 6.58E-07
r6* 1.88 0.00 5.08E-06 0.00
r7* -1.23E+01 0.00 1.19E-06 0.00
r8* -6.80E-02 0.00 6.44E-05 2.63E-07
可変間隔
視度[ディオプタ-] -1.00 -3.00 +1.00
d2 10.30 9.16 11.42
d8 1.68 2.82 0.56
（数値実施例２）
全体諸元
焦点距離 画像表示面対角長 ω
23.55 12.70 30.51°
レンズデータ
近軸曲率半径 軸上面間隔 屈折率(Nd) アッベ数(νd)
r1 = ∞ d1 = 1.00 N0 = 1.52 ν0 = 64.14
r2 = ∞ d2 = 可変
r3* = 930.19 d3 = 2.90 N1 = 1.53 ν1 = 56.00
r4* = -11.78 d4 = 3.90
r5* = -8.10 d5 = 1.75 N2 = 1.63 ν2 = 23.90
r6* = -41.48 d6 = 3.26
r7* = 37.48 d7 = 4.19 N3 = 1.53 ν3 = 56.00
r8* = -12.41 d8 = 可変
r9 = ∞ d9 = 1.00 N4 = 1.52 ν4 = 64.14
r10 = ∞ d10 = 18.00
r11 = ∞
非球面係数
k c2 c4 c6
r3* 1.64E+04 0.00 0.00 0.00
r4* -3.07 0.00 -8.94E-05 4.17E-07
r5* -3.29E-01 0.00 1.86E-04 6.58E-07
r6* -2.11E+01 0.00 0.00 0.00
r7* -7.44 0.00 0.00 0.00
r8* -4.65E-01 0.00 5.53E-05 -2.45E-10
可変間隔
視度[ディオプタ-] -1.00 -3.00 +1.00
d2 10.26 9.13 11.39
d8 1.68 2.81 0.55
（数値実施例３）
全体諸元
焦点距離 画像表示面対角長 ω
22.41 12.70 32.03°
レンズデータ
近軸曲率半径 軸上面間隔 屈折率(Nd) アッベ数(νd)
r1 = ∞ d1 = 1.00 N0 = 1.52 ν0 = 64.14
r2 = ∞ d2 = 可変
r3* = -129.42 d3 = 2.81 N1 = 1.53 ν1 = 56.00
r4* = -11.87 d4 = 4.36
r5* = -8.36 d5 = 1.76 N2 = 1.63 ν2 = 23.90
r6* = -98.33 d6 = 2.16
r7* = 52.94 d7 = 4.19 N3 = 1.69 ν3 = 53.20
r8* = -12.63 d8 = 可変
r9 = ∞ d9 = 1.00 N4 = 1.52 ν4 = 64.14
r10 = ∞ d10 = 18.00
r11 = ∞
非球面係数
k c2 c4 c6
r3* -2.02E+02 0.00 0.00 0.00
r4* -5.68 0.00 -2.00E-04 1.47E-06
r5* -2.41 0.00 -2.71E-04 6.58E-07
r6* -1.46E+02 0.00 0.00 0.00
r7* -1.35E+01 0.00 0.00 0.00
r8* -1.65 0.00 -3.29E-05 1.59E-08
可変間隔
視度[ディオプタ-] -1.00 -3.00 +1.00
d2 9.22 8.21 10.24
d8 1.95 2.96 0.93
（数値実施例４）
全体諸元
焦点距離 画像表示面対角長 ω
21.67 12.70 33.11°
レンズデータ
近軸曲率半径 軸上面間隔 屈折率(Nd) アッベ数(νd)
r1 = ∞ d1 = 1.00 N0 = 1.52 ν0 = 64.14
r2 = ∞ d2 = 可変
r3* = -86.89 d3 = 3.37 N1 = 1.58 ν1 = 59.46
r4* = -10.40 d4 = 4.07
r5* = -6.83 d5 = 2.00 N2 = 1.82 ν2 = 24.06
r6* = -21.79 d6 = 1.70
r7* = 98.32 d7 = 4.31 N3 = 1.69 ν3 = 53.20
r8* = -11.53 d8 = 可変
r9 = ∞ d9 = 1.00 N4 = 1.52 ν4 = 64.14
r10 = ∞ d10 = 18.00
r11 = ∞
非球面係数
k c2 c4 c6
r3* 1.24E+02 0.00 0.00 0.00
r4* -2.78 0.00 -9.79E-05 -4.49E-07
r5* -2.07 0.00 -2.97E-04 6.58E-07
r6* -9.48 0.00 0.00 0.00
r7* 6.64 0.00 0.00 0.00
r8* -1.55 0.00 -2.91E-05 -1.66E-08
可変間隔
視度[ディオプタ-] -1.00 -3.00 +1.00
d2 8.71 7.76 9.65
d8 1.46 2.41 0.52
(Numerical example 1)
Overall focal length Image display diagonal length ω
23.61 12.70 30.80 °
Lens data Paraxial radius of curvature Axis top surface Refractive index (Nd) Abbe number (νd)
r1 = ∞ d1 = 1.00 N0 = 1.52 ν0 = 64.14
r2 = ∞ d2 = variable
r3 = ∞ d3 = 3.13 N1 = 1.57 ν1 = 56.36
r4 * = -12.90 d4 = 3.73
r5 * = -8.29 d5 = 1.80 N2 = 1.63 ν2 = 23.90
r6 * = -36.48 d6 = 3.24
r7 * = 59.06 d7 = 4.12 N3 = 1.57 ν3 = 56.36
r8 * = -12.65 d8 = variable
r9 = ∞ d9 = 1.00 N4 = 1.52 ν4 = 64.14
r10 = ∞ d10 = 18.00
r11 = ∞
Aspheric coefficient
k c2 c4 c6
r4 * -3.32 0.00 -6.56E-05 2.66E-07
r5 * -3.36E-01 0.00 1.08E-04 6.58E-07
r6 * 1.88 0.00 5.08E-06 0.00
r7 * -1.23E + 01 0.00 1.19E-06 0.00
r8 * -6.80E-02 0.00 6.44E-05 2.63E-07
Variable interval diopter [Diopter-] -1.00 -3.00 +1.00
d2 10.30 9.16 11.42
d8 1.68 2.82 0.56
(Numerical example 2)
Overall focal length Image display diagonal length ω
23.55 12.70 30.51 °
Lens data Paraxial radius of curvature Axis top surface Refractive index (Nd) Abbe number (νd)
r1 = ∞ d1 = 1.00 N0 = 1.52 ν0 = 64.14
r2 = ∞ d2 = variable
r3 * = 930.19 d3 = 2.90 N1 = 1.53 ν1 = 56.00
r4 * = -11.78 d4 = 3.90
r5 * = -8.10 d5 = 1.75 N2 = 1.63 ν2 = 23.90
r6 * = -41.48 d6 = 3.26
r7 * = 37.48 d7 = 4.19 N3 = 1.53 ν3 = 56.00
r8 * = -12.41 d8 = variable
r9 = ∞ d9 = 1.00 N4 = 1.52 ν4 = 64.14
r10 = ∞ d10 = 18.00
r11 = ∞
Aspheric coefficient
k c2 c4 c6
r3 * 1.64E + 04 0.00 0.00 0.00
r4 * -3.07 0.00 -8.94E-05 4.17E-07
r5 * -3.29E-01 0.00 1.86E-04 6.58E-07
r6 * -2.11E + 01 0.00 0.00 0.00
r7 * -7.44 0.00 0.00 0.00
r8 * -4.65E-01 0.00 5.53E-05 -2.45E-10
Variable interval diopter [Diopter-] -1.00 -3.00 +1.00
d2 10.26 9.13 11.39
d8 1.68 2.81 0.55
(Numerical Example 3)
Overall focal length Image display diagonal length ω
22.41 12.70 32.03 °
Lens data Paraxial radius of curvature Axis top surface Refractive index (Nd) Abbe number (νd)
r1 = ∞ d1 = 1.00 N0 = 1.52 ν0 = 64.14
r2 = ∞ d2 = variable
r3 * = -129.42 d3 = 2.81 N1 = 1.53 ν1 = 56.00
r4 * = -11.87 d4 = 4.36
r5 * = -8.36 d5 = 1.76 N2 = 1.63 ν2 = 23.90
r6 * = -98.33 d6 = 2.16
r7 * = 52.94 d7 = 4.19 N3 = 1.69 ν3 = 53.20
r8 * = -12.63 d8 = variable
r9 = ∞ d9 = 1.00 N4 = 1.52 ν4 = 64.14
r10 = ∞ d10 = 18.00
r11 = ∞
Aspheric coefficient
k c2 c4 c6
r3 * -2.02E + 02 0.00 0.00 0.00
r4 * -5.68 0.00 -2.00E-04 1.47E-06
r5 * -2.41 0.00 -2.71E-04 6.58E-07
r6 * -1.46E + 02 0.00 0.00 0.00
r7 * -1.35E + 01 0.00 0.00 0.00
r8 * -1.65 0.00 -3.29E-05 1.59E-08
Variable interval diopter [Diopter-] -1.00 -3.00 +1.00
d2 9.22 8.21 10.24
d8 1.95 2.96 0.93
(Numerical example 4)
Overall focal length Image display diagonal length ω
21.67 12.70 33.11 °
Lens data Paraxial radius of curvature Axis top surface Refractive index (Nd) Abbe number (νd)
r1 = ∞ d1 = 1.00 N0 = 1.52 ν0 = 64.14
r2 = ∞ d2 = variable
r3 * = -86.89 d3 = 3.37 N1 = 1.58 ν1 = 59.46
r4 * = -10.40 d4 = 4.07
r5 * = -6.83 d5 = 2.00 N2 = 1.82 ν2 = 24.06
r6 * = -21.79 d6 = 1.70
r7 * = 98.32 d7 = 4.31 N3 = 1.69 ν3 = 53.20
r8 * = -11.53 d8 = variable
r9 = ∞ d9 = 1.00 N4 = 1.52 ν4 = 64.14
r10 = ∞ d10 = 18.00
r11 = ∞
Aspheric coefficient
k c2 c4 c6
r3 * 1.24E + 02 0.00 0.00 0.00
r4 * -2.78 0.00 -9.79E-05 -4.49E-07
r5 * -2.07 0.00 -2.97E-04 6.58E-07
r6 * -9.48 0.00 0.00 0.00
r7 * 6.64 0.00 0.00 0.00
r8 * -1.55 0.00 -2.91E-05 -1.66E-08
Variable interval diopter [Diopter-] -1.00 -3.00 +1.00
d2 8.71 7.76 9.65
d8 1.46 2.41 0.52
次に、図１１を参照して、電子ビューファインダを備えた撮像装置について説明する。図１１は、各実施例の接眼光学系を備えた撮像装置１００の概略図である。図１１において、撮影レンズ１０１（撮像光学系）により形成された被写体像は、光電変換素子である撮像素子１０２により電気信号に変換される。撮像素子１０２としては、ＣＣＤセンサやＣＭＯＳセンサなどが用いられる。 Next, with reference to FIG. 11, an imaging apparatus including an electronic viewfinder will be described. FIG. 11 is a schematic diagram of an imaging apparatus 100 including the eyepiece optical system of each embodiment. In FIG. 11, a subject image formed by a photographing lens 101 (imaging optical system) is converted into an electric signal by an imaging element 102 which is a photoelectric conversion element. As the imaging element 102, a CCD sensor, a CMOS sensor, or the like is used.
撮像素子１０２からの出力が画像処理回路１０３において処理されることにより、画像が形成される。この画像は、半導体メモリ、磁気テープ、光ディスクなどの記録媒体に記録される。また、画像処理回路１０３にて形成された画像は、電子ビューファインダ１０５（ＥＶＦ）に表示される。電子ビューファインダ１０５は、表示素子１０５１（液晶表示素子ＬＣＤ）および各実施例の接眼光学系１０５２を備えて構成されている。観察者１０６は、電子ビューファインダを観察しながら撮像を行うことが可能である。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などの種々の撮像装置に適用可能である。 An image is formed by processing the output from the image sensor 102 in the image processing circuit 103. This image is recorded on a recording medium such as a semiconductor memory, a magnetic tape, or an optical disk. The image formed by the image processing circuit 103 is displayed on the electronic viewfinder 105 (EVF). The electronic viewfinder 105 includes a display element 1051 (liquid crystal display element LCD) and an eyepiece optical system 1052 of each example. The observer 106 can take an image while observing the electronic viewfinder. The eyepiece optical system of each embodiment can be applied to various imaging devices such as a digital camera and a video camera.
本実施例の接眼光学系によれば、視野角が大きく像面湾曲や歪曲収差などの諸収差を低減し、レンズの偏芯敏感度を低減することができる。このため本実施例によれば、高視野角で高性能な接眼光学系、電子ビューファインダ、および、撮像装置を提供することができる。 According to the eyepiece optical system of this embodiment, the viewing angle is large and various aberrations such as field curvature and distortion can be reduced, and the decentering sensitivity of the lens can be reduced. For this reason, according to the present embodiment, it is possible to provide a high viewing angle, high performance eyepiece optical system, electronic viewfinder, and imaging apparatus.
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.
Ｌ１：第１のレンズ
Ｌ２：第２のレンズ
Ｌ３：第３のレンズ
L1: First lens L2: Second lens L3: Third lens
Claims (7)
前記第１のレンズの焦点距離をｆ１、前記第２のレンズの焦点距離をｆ２、全系の焦点距離をｆ、前記第１のレンズと前記第２のレンズの光軸上の間隔をｄ１２、前記第２のレンズと前記第３のレンズの光軸上の間隔をｄ２３、前記第１のレンズの観察側のレンズ面の近軸曲率半径をｒ１２、前記第２のレンズの物体側のレンズ面の近軸曲率半径をｒ２１とするとき、
−０．５０＜(ｄ１２＋ｄ２３)／ｆ２＜−０．３０
−６．１＜（ｒ２１＋ｒ１２）／（ｒ２１−ｒ１２）＜−４．０
０．８＜ｆ１／ｆ＜１．２
なる条件式を満たすことを特徴とする接眼光学系。 A first lens having positive refractive power, arranged in order from the object side to the observation side, a second meniscus lens having negative refractive power and a concave surface facing the object side, and positive refractive power An eyepiece optical system comprising a third lens having
The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the entire system is f, and the distance on the optical axis between the first lens and the second lens is d12, The distance on the optical axis between the second lens and the third lens is d23, the paraxial radius of curvature of the lens surface on the observation side of the first lens is r12, the lens surface on the object side of the second lens When the paraxial radius of curvature is r21,
−0.50 <(d12 + d23) / f2 <−0.30
−6.1 <(r21 + r12) / (r21−r12) <− 4.0
0.8 <f1 / f <1.2
An eyepiece optical system satisfying the following conditional expression:
１．０＜（ｒ２２＋ｒ２１）／（ｒ２２−ｒ２１）＜２．０
なる条件式を満たすことを特徴とする請求項１に記載の接眼光学系。 When the paraxial radius of curvature of the lens surface on the object side of the second lens is r21 and the paraxial radius of curvature of the lens surface on the observation side of the second lens is r22,
1.0 <(r22 + r21) / (r22-r21) <2.0
The eyepiece optical system according to claim 1, wherein the following conditional expression is satisfied.
−１．６＜（ｒ１２＋ｒ１１）／（ｒ１２−ｒ１１）＜−０．８
なる条件式を満たすことを特徴とする請求項１または２に記載の接眼光学系。 When the paraxial radius of curvature of the lens surface on the object side of the first lens is r11 and the paraxial radius of curvature of the lens surface on the observation side of the first lens is r12,
−1.6 <(r12 + r11) / (r12−r11) <− 0.8
The eyepiece optical system according to claim 1, wherein the following conditional expression is satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013075731A JP6195345B2 (en) | 2013-04-01 | 2013-04-01 | Eyepiece optical system, electronic viewfinder, and imaging device |
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| JP2013075731A JP6195345B2 (en) | 2013-04-01 | 2013-04-01 | Eyepiece optical system, electronic viewfinder, and imaging device |
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| JP2014202770A5 JP2014202770A5 (en) | 2016-04-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6435784B2 (en) * | 2014-11-06 | 2018-12-12 | リコーイメージング株式会社 | Eyepiece optics |
| JP6435783B2 (en) * | 2014-11-06 | 2018-12-12 | リコーイメージング株式会社 | Eyepiece optics |
| CN105278109B (en) * | 2015-07-10 | 2017-11-28 | 深圳纳德光学有限公司 | Big angle of visual field eyepiece optical system |
| CN108398784B (en) * | 2015-11-16 | 2019-12-20 | 张琴 | Head-mounted display device adopting optical eyepiece lens |
| JP7118653B2 (en) * | 2018-01-26 | 2022-08-16 | キヤノン株式会社 | Observation device |
| CN115236847B (en) * | 2022-09-20 | 2023-04-07 | 江西联昊光电有限公司 | Eyepiece optical system and head-mounted display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5136618B2 (en) * | 2010-09-21 | 2013-02-06 | 株式会社ニコン | Observation optical system, finder apparatus including the observation optical system, and method for manufacturing the observation optical system |
| JP5886707B2 (en) * | 2012-07-24 | 2016-03-16 | 京セラ株式会社 | Eyepiece optical system for viewfinder and imaging apparatus using the same |
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