JP7118653B2 - Observation device - Google Patents
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- JP7118653B2 JP7118653B2 JP2018011375A JP2018011375A JP7118653B2 JP 7118653 B2 JP7118653 B2 JP 7118653B2 JP 2018011375 A JP2018011375 A JP 2018011375A JP 2018011375 A JP2018011375 A JP 2018011375A JP 7118653 B2 JP7118653 B2 JP 7118653B2
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- 230000003287 optical effect Effects 0.000 claims description 64
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- 238000010586 diagram Methods 0.000 description 13
- 201000009310 astigmatism Diseases 0.000 description 11
- 239000006059 cover glass Substances 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
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Description
本発明は、観察装置に関する。 The present invention relates to an observation device.
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。 2. Description of the Related Art Conventionally, in an electronic viewfinder (observation device), an eyepiece optical system is used for magnifying and observing an image displayed on an image display device 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), a sufficiently long eye relief (distance from the lens surface on the observation side to the eye point), aberration It is desired to have high optical performance with good correction of . Furthermore, due to the demand for miniaturization of observation devices, image display elements used in observation devices are required to have small dimensions (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 wide viewing angle for observation have been proposed (Patent Documents 1 and 2). In Patent Document 1, from the image display surface side toward the observation side, a first lens having a positive refractive power, a second meniscus lens having a negative refractive power with a concave surface facing the image display surface side, and a lens having a positive refractive power. An eyepiece optical system with 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 between the first lens and the second lens, the distance on the optical axis between 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 of the second lens on the image display surface side are appropriately set. As a result, a high-performance eyepiece optical system with a wide viewing angle (observation viewing angle) and reduced sensitivity of each lens is proposed.
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 with a positive refractive power, a second lens with a negative refractive power, and a third lens with a positive refractive power is arranged from the image display surface side toward the observation side. disclosed. 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 curvature of field and distortion are well corrected. proposed an eyepiece optical system that
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 order to secure a wide viewing angle and a long eye relief in an eyepiece optical system used in an observation device, 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 an image display element having 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.
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, if the refractive power of the entire system becomes weak, it becomes difficult to obtain a wide viewing angle. Also, if the refractive power of each lens is not properly arranged, it will be difficult to increase the eye relief. Also, when observing at a distance from the eyepiece optical system, the image tends to be obscured around the observation field of view.
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。 SUMMARY OF THE INVENTION It is an object of the present invention to provide an observation apparatus that enables observation of an image on an image display surface at a wide viewing angle, satisfactorily corrects various aberrations, 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レンズからなり、
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、前記第2レンズの画像表示面側のレンズ面の近軸曲率半径をr21、前記第2レンズの観察側のレンズ面の近軸曲率半径をr22とするとき、
0.305<H/f<0.440
0.846≦f1/f3<1.24
-40.0<(r21+r22)/(r21-r22)≦-1.650
なる条件式を満足することを特徴としている。
An observation apparatus of the present invention is an observation apparatus having an image display element for displaying an image and an eyepiece optical system for observing the image displayed on the image display surface of the image display element,
The eyepiece optical system comprises a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with positive refractive power, which are arranged in order from the image display surface to the observation side,
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, half the diagonal length of the image display surface is H, and the image display surface of the second lens. When r21 is the paraxial radius of curvature of the lens surface on the side, and r22 is the paraxial radius of curvature of the observation side lens surface of the second lens,
0.305<H/f<0.440
0.846≦f1/f3<1.24
-40.0<(r21+r22)/(r21-r22)≤-1.650
It is characterized by satisfying 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。 According to the present invention, it is possible to obtain an observation device that allows observation of an image on an image display surface at a wide viewing angle, satisfactorily corrects various aberrations, secures high optical performance, and easily secures a long eye point.
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。 An eyepiece optical system according to an embodiment and an observation apparatus having the same will be described below. The observation device of the present invention has an image display element for displaying an image and an ocular optical system for observing the 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 has a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with positive refractive power, which are arranged in order from the image display surface to the viewing side. You may have the 4th lens of positive or negative refractive power on the observation side of the 3rd lens.
図1は参考例1の観察装置のレンズ断面図である。図2は本発明の参考例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。 FIG. 1 is a sectional view of a lens of an observation device of Reference Example 1. FIG. FIG. 2 is an aberration diagram when the eyepiece optical system according to Reference Example 1 of the present invention has a diopter of -1.0 diopter (standard diopter).
図3は参考例2の観察装置のレンズ断面図である。図4は参考例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。 FIG. 3 is a sectional view of the lens of the observation device of Reference Example 2. FIG. FIG. 4 is an aberration diagram when the diopter of the eyepiece optical system according to Reference Example 2 is -1.0 diopter.
図5は実施例1の観察装置のレンズ断面図である。図6は実施例1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 cross-sectional view of the lens of the observation device of Example 1. FIG. FIG. 6 is an aberration diagram when the diopter of the eyepiece optical system according to Example 1 is -1.0 diopter.
図7は実施例2の観察装置のレンズ断面図である。図8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。 FIG. 7 is a cross-sectional view of the lens of the observation device of Example 2. FIG. FIG. 8 is an aberration diagram when the eyepiece optical system according to Example 2 has a diopter of -1.0 diopter.
図9は参考例3の観察装置のレンズ断面図である。図10は参考例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. 9 is a sectional view of a lens of an observation device of Reference Example 3. FIG. FIG. 10 is an aberration diagram when the diopter of the eyepiece optical system according to Reference Example 3 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 for an electronic viewfinder (observation device) of an imaging device such as a digital camera or a video camera. In the 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 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, organic EL, or the like. EP is an observation plane (eyepoint) (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。 In the spherical aberration diagrams among the aberration diagrams, 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 diagrams, S (solid line) indicates a sagittal image plane for the d-line, and M (broken line) indicates a meridional image plane for the d-line. Distortion is shown for the d-line. Lateral chromatic aberration is shown for the F-line. H is half the diagonal length (maximum image height) of the image display surface. Numerical values are values when numerical data to be described later are expressed in units of 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) with a diagonal length of 10 mm to 25 mm at a viewing angle of 30 degrees to 45 degrees, the eyepiece optical system must have a strong positive refraction. Power is required. Furthermore, in order to lengthen the eye relief, it is necessary to increase the F-number of the eyepiece optical system, and to do so, it is necessary to widen the effective light 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, more spherical aberration, curvature of field, astigmatism, and chromatic aberration occur than in the eyepiece optical system, making it difficult to correct these various aberrations. At this time, residual aberrations such as spherical aberration, field curvature, astigmatism, and chromatic aberration deteriorate the optical performance of the entire image display surface, especially the periphery of the image display surface.
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 various aberrations at this time, the eyepiece optical system L0 according to each embodiment has the following configuration. A first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and a second lens L2 with positive refractive power, which are arranged in order from the image display plane (object plane) IP to the observation plane (eye point) EP side. It has three lenses L3.
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, preferably, a fourth lens having a positive refractive power may be provided on the viewing 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 half the diagonal length of the image display plane 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。
さらに、
0.846≦f1/f3<1.24・・・(2´)
を満足することが好ましい。
At this time,
0.305<H/f<0.440 (1)
0.48<f1/f3<1.24 (2)
satisfies the following conditional expression.
moreover,
0.846≦f1/f3<1.24 (2′)
is preferably 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。 By constructing the eyepiece optical system according to each embodiment as described above, the viewing angle is wide, the eye relief is long, and various aberrations such as spherical aberration, curvature of field, astigmatism, and chromatic aberration are sufficiently reduced. A corrected high optical performance is obtained.
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, the technical meaning of each of the above conditional expressions will be explained. Conditional expression (1) defines the relationship between half the diagonal length of the image display plane IP (the maximum height of the object plane) and the focal length of the eyepiece optical system. This is for correcting a wide viewing angle (observation viewing angle) and various aberrations such as spherical aberration, curvature of field, 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。 If the upper limit of conditional expression (1) is exceeded, the effective system of eyepiece optical system L0 becomes large and the power balance of each lens deteriorates in order to secure the optical path of the light rays of maximum height on image display plane IP. In addition, the focal length of the eyepiece optical system L0 with respect to the maximum height of the image display plane IP is reduced. For these reasons, the effect of correcting various aberrations such as spherical aberration, curvature of field, and astigmatism becomes insufficient. If the lower limit of conditional expression (1) is exceeded, the focal length of the eyepiece optical system L0 becomes too long with respect to the maximum height of the image display plane IP, making it 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 for obtaining a wide viewing angle and a long eye relief while satisfactorily correcting mainly various aberrations such as spherical aberration, curvature of field, 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 positive power (refractive power) of the first lens L1 becomes weaker than the upper limit of conditional expression (2), correction of various aberrations such as spherical aberration, curvature of field, and astigmatism becomes insufficient. . If the lower limit of conditional expression (2) is exceeded and the power of the first lens L1 becomes too strong, it will be difficult to increase 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 radius of curvature of the lens surface of the second lens L2 on the image display side is r21 (mm), and the paraxial radius of curvature of the lens surface of the second lens L2 on the viewing side is r22 (mm). Let r12 (mm) be the paraxial radius of curvature of the observation side lens surface of the first lens L1, and d12 (mm) be the distance between the first lens L1 and the second lens L2. At this time, it is preferable to satisfy one or more of the following conditional expressions.
-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。
さらに、
-40.0<(r21+r22)/(r21-r22)≦-1.650・・・(3´)
を満足することが好ましい。
-40.0<(r21+r22)/(r21-r22)<-0.9 (3)
0.00 (1/mm) < (1/r12-1/r21 + d12/(r12 x r21 x 3)) <0.12 (1/mm)
... (4)
In numerical data to be described later, r2 corresponds to r12, r3 to r21, and r4 to r22.
moreover,
−40.0<(r21+r22)/(r21−r22)≦−1.650 (3′)
is preferably satisfied.
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 explained.
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. Conditional expression (3) is for satisfactorily correcting various aberrations while ensuring 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 of conditional expression (3) is exceeded, the power balance of the second lens L2 will deteriorate and the eye relief will become short. If the lower limit of conditional expression (3) is exceeded, the curvature of the observation-side lens surface of the second lens L2 becomes steep, making it difficult to correct various aberrations such as spherical aberration, curvature of field, and astigmatism. 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 for ensuring a long eye relief while satisfactorily correcting various aberrations, mainly curvature of field, 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 conditional expression (4) is exceeded, the negative power of the air lens will become too strong (the absolute value of the negative refractive power will become too large), resulting in spherical aberration, curvature of field, astigmatism, and other aberrations. Aberration correction becomes insufficient. If 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 the rays are condensed by the air lens, resulting in a short eye relief. 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) are 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と各参考例の接眼光学系に対応する数値データを示す。数値データ1は参考例1に、数値データ2は参考例2に、数値データ3は実施例1に、数値データ4は実施例2に、数値データ5は参考例3に対応している。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 systems of the respective examples and reference examples of the present invention are shown below. Numerical data 1 corresponds to Reference Example 1, Numerical Data 2 corresponds to Reference Example 2, Numerical Data 3 corresponds to Example 1,
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 the axial top surface distance between the i-th surface and the (i+1)-th surface in order from the image display surface IP. Furthermore, Ndi indicates the refractive index for the d-line (wavelength=578.6 nm) of the i-th material, and νdi indicates the Abbe number for the d-line of the i-th material.
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, [mm] is used as the unit of length unless otherwise specified. However, since the eyepiece optical system can obtain the same optical performance even if it is proportionally enlarged or proportionally reduced, the unit is not limited to [mm], and other appropriate units can be used. In the numerical data, the surface with the suffix "*" written in the paraxial radius of curvature column has an aspheric shape defined by the following formula (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 (Formula 1), x is the distance in the direction of the optical axis 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, and k is the cone. The constants c2, c4, c6, c8 are the polynomial coefficients. In the aspherical coefficients, "Ei" represents a base 10 exponential expression, ie, "10 -i ". Table 1 shows the calculation results of each conditional expression 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。 Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist.
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 (3)
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レンズからなり、
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、前記第2レンズの画像表示面側のレンズ面の近軸曲率半径をr21、前記第2レンズの観察側のレンズ面の近軸曲率半径をr22とするとき、
0.305<H/f<0.440
0.846≦f1/f3<1.24
-40.0<(r21+r22)/(r21-r22)≦-1.650
なる条件式を満足することを特徴とする観察装置。 An observation device having an image display element for displaying an image and an eyepiece optical system for observing the image displayed on the image display surface of the image display element,
The eyepiece optical system comprises a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with positive refractive power, which are arranged in order from the image display surface to the observation side,
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, half the diagonal length of the image display surface is H, and the image display surface of the second lens. When r21 is the paraxial radius of curvature of the lens surface on the side, and r22 is the paraxial radius of curvature of the observation side lens surface of the second lens,
0.305<H/f<0.440
0.846≦f1/f3<1.24
-40.0<(r21+r22)/(r21-r22)≤-1.650
An observation device characterized by satisfying the following conditional expression:
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に記載の観察装置。 The paraxial radius of curvature of the observation side lens surface of the first lens is r12 (mm), the paraxial radius of curvature of the lens surface of the second lens on the image display side side is r21 (mm), and the first lens is observed. 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)
2. The observation device according to claim 1, wherein the following conditional expression is satisfied.
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