JPH0682694A - Aspherical lens system - Google Patents
Aspherical lens systemInfo
- Publication number
- JPH0682694A JPH0682694A JP4227567A JP22756792A JPH0682694A JP H0682694 A JPH0682694 A JP H0682694A JP 4227567 A JP4227567 A JP 4227567A JP 22756792 A JP22756792 A JP 22756792A JP H0682694 A JPH0682694 A JP H0682694A
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- JP
- Japan
- Prior art keywords
- lens
- aspherical
- case
- magnification
- finder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、 例えばコンパクト
カメラのファインダーの対物系等の結像光学系に用いら
れる非球面レンズ系に関し、特に偏心による像性能の劣
化が少ない非球面レンズ系に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aspherical lens system used for an image forming optical system such as an objective system of a viewfinder of a compact camera, and more particularly to an aspherical lens system in which image performance is less deteriorated by decentering.
【０００２】[0002]
【従来の技術】従来から、例えばカメラの撮影光学系や
ファインダー光学系の対物系等の結像光学系では、小型
化のため、及び少ない構成枚数で良好な結像性能を得る
ため、また、変倍光学系にあっては高い変倍率を得るた
め、光学系中に非球面レンズが多用される傾向にある。2. Description of the Related Art Conventionally, in an image forming optical system such as a photographing optical system of a camera or an objective system of a finder optical system, in order to achieve a compact size and to obtain a good image forming performance with a small number of components, In a variable power optical system, an aspherical lens is often used in the optical system in order to obtain a high variable power.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、非球面
レンズを用いた場合には、設計性能を向上させることが
できる反面、実装時の誤差、例えば非球面レンズの製造
誤差や組付け時の偏心誤差が生じた場合に、結像性能が
著しく劣化する可能性がある。However, when an aspherical lens is used, the design performance can be improved, but on the other hand, an error in mounting, such as a manufacturing error of the aspherical lens or an eccentricity error in assembling. In the case of occurrence of, the imaging performance may be significantly deteriorated.
【０００４】偏心誤差には、図３７(a)に示すようなレ
ンズの片面の近軸曲率中心が光学系の設計光軸に一致し
ないレンズ面単位の偏心誤差と、図３７(b)に示すよう
なレンズ両面の近軸曲率中心が光軸と一致しないレンズ
単位の偏心誤差とがある。The eccentricity error is shown in FIG. 37 (a), and the eccentricity error for each lens surface in which the paraxial curvature center of one surface of the lens does not match the design optical axis of the optical system is shown in FIG. 37 (b). There is an eccentricity error for each lens in which the paraxial curvature center on both surfaces of the lens does not coincide with the optical axis.
【０００５】[0005]
【発明の目的】この発明は、上記の課題に鑑み、実装時
の誤差、特に、偏心誤差が生じた場合にも結像性能の劣
化が少ない非球面レンズ系を提供することを目的とす
る。SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide an aspherical lens system in which the image forming performance is less deteriorated even when an error in mounting, particularly, an eccentric error occurs.
【０００６】[0006]
【課題を解決するための手段】この発明にかかる非球面
レンズ系は、上記の目的を達成させるため、１枚の両面
非球面の第１レンズと、少なくとも一方の面が非球面で
ある第２レンズとを有し、かつ、以下の条件を満たすこ
とを特徴とする。In order to achieve the above-mentioned object, an aspherical lens system according to the present invention includes a single first lens having aspherical surfaces on both sides and a second lens having at least one surface that is an aspherical surface. It has a lens and satisfies the following conditions.
【０００７】｜ＳＦ1｜＜１ …(1) ０≦｜｜ＳＦ1｜−｜ＳＦ2｜｜≦４ …(2) ただし、ＳＦ1は第１レンズのシェイプファクター、Ｓ
Ｆ2は第２レンズのシェイプファクターである。| SF1 | <1 (1) 0 ≦ || SF1 | − | SF2 || ≦ 4 (2) where SF1 is the shape factor of the first lens, S
F2 is the shape factor of the second lens.
【０００８】[0008]
【実施例】以下、この発明の実施例を図面に基づいて説
明する。実施例は、この発明の非球面レンズ系をコンパ
クトカメラ等に用いられる実像式変倍ファインダーに組
み込んだ例を示している。Embodiments of the present invention will be described below with reference to the drawings. The embodiment shows an example in which the aspherical lens system of the present invention is incorporated in a real image type variable power finder used in a compact camera or the like.
【０００９】実施例の実像式変倍ファインダーは、例え
ば図１に示すように、物体側から順に、第１面から第１
０面で示される対物レンズ系と、第１１面と第１２面と
で表され、対物レンズ系による物体像を接眼側に導くコ
ンデンサレンズと、第１３面及び第１４面で展開して示
された物体像の反転のための正立光学系としてのプリズ
ム系と、第１５面から第１８面で表された正レンズと負
レンズとから構成され、反転された像を眼に導く接眼レ
ンズ系とを備える。The real image type variable magnification finder of the embodiment is, for example, as shown in FIG. 1, in order from the object side, from the first surface to the first surface.
The objective lens system shown by the 0th surface, the 11th surface and the 12th surface, and the condenser lens for guiding the object image by the objective lens system to the eyepiece side, and the 13th surface and the 14th surface are shown expanded. A prism system as an erecting optical system for reversing an object image, and an eyepiece lens system including a positive lens and a negative lens represented by the fifteenth to eighteenth surfaces to guide the reversed image to the eye. With.
【００１０】例えば、図１に示される実施例１では、図
中最も左側となる物体側から順に、ｒ1,ｒ2で示される
カバーガラスに続き、ｒ3,ｒ4で示される負の第１レン
ズと、ｒ5,ｒ6で示される負の第２レンズとの２つの非
球面レンズが順に設けられている。For example, in the first embodiment shown in FIG. 1, the cover glass indicated by r1 and r2 is followed by the negative first lens indicated by r3 and r4 in this order from the leftmost object side in the figure. Two aspherical lenses, which are a negative second lens denoted by r5 and r6, are provided in order.
【００１１】実施例のレンズは、これらの第１、第２レ
ンズが上記の(1),(2)の条件を満たすことを特徴として
いる。これらの式中に用いられるシェイプファクターＳ
Ｆは、レンズ両面の近軸曲率半径をｒ1、ｒ2として、以
下の式で与えられる。The lens of the embodiment is characterized in that these first and second lenses satisfy the above conditions (1) and (2). Shape factor S used in these equations
F is given by the following equation, where paraxial radii of curvature on both surfaces of the lens are r1 and r2.
【００１２】ＳＦ＝(ｒ1＋ｒ2)／(ｒ2−ｒ1)SF = (r1 + r2) / (r2-r1)
【００１３】このシェイプファクターＳＦは、非球面に
おいては主に光軸付近の面形状を決定するファクターで
あり、上記の(1)(2)の条件を満たすことにより、製造誤
差、特に偏心誤差による結像性能の劣化が少ない光学系
を提供することができる。This shape factor SF is a factor that mainly determines the surface shape in the vicinity of the optical axis in an aspherical surface, and by satisfying the above conditions (1) and (2), manufacturing error, especially eccentricity error, is caused. It is possible to provide an optical system with little deterioration in imaging performance.
【００１４】特に、非球面レンズ系を実施例のようなフ
ァインダー系に用いる場合には、物体側のレンズが条件
(1)を満たし、像側のレンズが条件(2)を満たすことが望
ましい。In particular, when the aspherical lens system is used in the finder system as in the embodiment, the lens on the object side is a condition.
It is preferable that the condition (1) is satisfied and the lens on the image side satisfies the condition (2).
【００１５】なお、ワイド化のためには、実施例のよう
に第１レンズと第２レンズとを共に負レンズとして構成
することが望ましい。For widening, it is desirable that both the first lens and the second lens are constructed as negative lenses as in the embodiment.
【００１６】また、実施例のレンズは、有効半径内の非
球面パワーの変化量をＳＰとして、第１、第２レンズの
全ての面が少なくとも高倍率時に以下の条件(3)を満た
す。 ｜ＳＰ｜≦０．２ …(3)Further, in the lens of the embodiment, all the surfaces of the first and second lenses satisfy the following condition (3) at least at high magnification, where SP is the variation amount of the aspherical power within the effective radius. ｜ SP ｜ ≦ 0.2 (3)
【００１７】面パワーの変化量ＳＰの定義は、以下のと
おりである。非球面の形状は、光軸からの高さがyとな
る非球面上の座標点の非球面頂点の接平面からの距離を
x、非球面頂点の曲率(1／r)をC、円錐係数をK、4次、6
次、8次の非球面係数をA4,A6,A8として、(a)式のように
表される。また、その一次微分は(b)式、二次微分は(c)
式に示すとおりとなる。The definition of the surface power variation amount SP is as follows. The shape of the aspherical surface is the distance from the tangent plane of the aspherical vertex of the coordinate point on the aspherical surface whose height from the optical axis is y.
x, curvature of aspherical vertex (1 / r) is C, conic coefficient is K, 4th order, 6
Next, assuming that the aspherical coefficients of the 8th order are A4, A6, and A8, they are expressed as in the expression (a). Also, its first derivative is (b), and its second derivative is (c).
It is as shown in the formula.
【００１８】[0018]
【数１】 x= (Cy2／(1+√(1-(1+K)C2y2))) + A4y4 + A6y6 + A8y8 …(a) dx/dy = (Cy／√(1-(1+K)C2y2)) + 4A4y3 + 6A6y5 + 8A8y7 …(b) d2x/dy2 = (Cy／(1-(1+K)C2y2)3/2) + 12A4y2 + 30A6y4 + 56A8y6 …(c)[Equation 1] x = (Cy 2 / (1 + √ (1- (1 + K) C 2 y 2 ))) + A4y 4 + A6y 6 + A8y 8 … (a) dx / dy = (Cy / √ (1- (1 + K) C 2 y 2 )) + 4A4y 3 + 6A6y 5 + 8A8y 7 … (b) d 2 x / dy 2 = (Cy / (1- (1 + K) C 2 y 2 ) 3/2 ) + 12A4y 2 + 30A6y 4 + 56A8y 6 … (c)
【００１９】光軸からの高さyにおける非球面のメリデ
ィオナル断面の曲率１／ｒmは、以下の(d)式で表され
る。 １／ｒm＝(d2x/dy2)／(1 + (dx/dy)2)3/2 …(d)The curvature 1 / rm of the meridional section of the aspherical surface at the height y from the optical axis is expressed by the following equation (d). 1 / rm = (d 2 x / dy 2 ) / (1 + (dx / dy) 2 ) 3 / 2 … (d)
【００２０】光軸からの高さyにおける非球面の面パワ
ーψは、非球面前後の屈折率をｎ，ｎ'とすると、以下
の(e)式で表される。 ψ＝(ｎ−ｎ')／ｒm …(e)The surface power ψ of the aspherical surface at the height y from the optical axis is expressed by the following equation (e), where n and n ′ are the refractive indices before and after the aspherical surface. ψ = (n−n ′) / rm (e)
【００２１】そして、非球面の光軸から最周辺光束の通
過高さまでの範囲、すなわち、有効半径の範囲で、面の
最大パワーをψmax、最小パワーをψminとすると、変化
率ＳＰは、以下の式(f)で表される。 ＳＰ＝ψmax − ψmin …(f)If the maximum power of the surface is ψmax and the minimum power is ψmin in the range from the optical axis of the aspherical surface to the height of passage of the peripheral light flux, that is, in the range of the effective radius, the rate of change SP is as follows. It is represented by formula (f). SP = ψmax −ψmin (f)
【００２２】条件(3)を満たすことにより、光軸付近の
みでなく、周辺部分においても偏心誤差による光学性能
の劣化が少ないレンズ系を提供することができる。偏心
誤差による光学性能の劣化は、変倍系では特に高倍率の
ときに問題となるため、少なくとも高倍率時に条件(3)
をみたすことにより、性能劣化を抑えることができる。By satisfying the condition (3), it is possible to provide a lens system in which the optical performance is less deteriorated not only in the vicinity of the optical axis but also in the peripheral portion due to decentration error. Degradation of optical performance due to eccentricity becomes a problem especially at high magnification in variable power systems.
By satisfying, it is possible to suppress performance deterioration.
【００２３】第１、第２レンズの各面については、望ま
しくは各面のパワーの変化量をそれぞれＳＰ1、ＳＰ2、
ＳＰ3、ＳＰ4として、少なくとも高倍率時に以下の条件
(4)(5)(6)(7)を満たすことがより望ましい。With respect to each surface of the first and second lenses, it is desirable that the amount of change in the power of each surface be SP1, SP2,
The following conditions for SP3 and SP4 at least at high magnification
It is more desirable to satisfy (4) (5) (6) (7).
【００２４】｜ＳＰ1｜≦０．１ …(4) ｜ＳＰ2｜≦０．２ …(5) ｜ＳＰ3｜≦０．０４ …(6) ｜ＳＰ4｜≦０．０６ …(7)| SP1 | ≦ 0.1 (4) | SP2 | ≦ 0.2 (5) | SP3 | ≦ 0.04 (6) | SP4 | ≦ 0.06 (7)
【００２５】次に、実施例の具体的な構成について説明
する。Next, a specific structure of the embodiment will be described.
【００２６】[0026]
【実施例１】図１は実施例１の実像式変倍ファインダー
の低倍率時のレンズ図、図２は高倍率時のレンズ図であ
る。実施例１の具体的な数値構成は、表１から表３に示
した通りである。表中および図中の記号は、EPが最終レ
ンズの極からアイポイントまでの距離(アイレリーフ)、
rがレンズ各面の曲率半径、dがレンズ厚もしくはレンズ
間隔(以上単位はmm)、nが各レンズのd線の屈折率、νが
各レンズのd線のアッベ数、E.Rがアイリングである。Embodiment 1 FIG. 1 is a lens diagram of a real image type variable magnification finder of Embodiment 1 at a low magnification, and FIG. 2 is a lens diagram at a high magnification. Specific numerical configurations of Example 1 are as shown in Tables 1 to 3. The symbols in the table and figure are the distance from the pole of the last lens to the eye point (eye relief) in EP.
r is the radius of curvature of each surface of the lens, d is the lens thickness or lens spacing (the unit is mm), n is the refractive index of the d line of each lens, ν is the Abbe number of the d line of each lens, and ER is Eyring. is there.
【００２７】実施例１のレンズは、第3,4,5,6,7,10,11,
16面が非球面である。各非球面の円錐係数、非球面係数
は、表２に示す通りである。なお、表１における非球面
の曲率半径は、非球面頂点の曲率半径である。また、倍
率M、半画角ω、間隔d2,d6,d10は変倍に伴って表３に示
すように変化する。The lens of Example 1 is the third, fourth, fifth, sixth, seventh, tenth, eleventh,
16 surfaces are aspherical surfaces. The conical coefficient and aspherical surface coefficient of each aspherical surface are as shown in Table 2. The radius of curvature of the aspherical surface in Table 1 is the radius of curvature of the aspherical vertex. Further, the magnification M, the half angle of view ω, and the intervals d2, d6, d10 change as shown in Table 3 as the magnification changes.
【００２８】[0028]
【表１】 [Table 1]
【００２９】[0029]
【表２】 第３面 第４面 第５面 K = 0 K = 0 K = 0 A4 = 0.48696527×10-3 A4 = 0.33563204×10-3 A4 =-0.18346250×10-2 A6 = 0.47800406×10-4 A6 = 0.55758065×10-4 A6 = 0.11751226×10-3 A8 =-0.53602476×10-6 A8 = 0.41814929×10-5 A8 =-0.12386343×10-5 第６面 第７面 第10面 K = 0 K = 0 K = 0 A4 =-0.12659367×10-2 A4 =-0.77171759×10-3 A4 = 0.72323597×10-3 A6 = 0.57233484×10-4 A6 =-0.31552902×10-4 A6 =-0.55079160×10-5 A8 =-0.25340844×10-6 A8 = 0.37181436×10-6 A8 =-0.16031890×10-5 第11面 第16面 K = 0 K = 0 A4 = 0.11728471×10-3 A4 = 0.10114791×10-3 A6 =-0.46239682×10-5 A6 =-0.13207013×10-6 A8 = 0 A8 = 0TABLE 2 third surface fourth surface fifth surface K = 0 K = 0 K = 0 A4 = 0.48696527 × 10 -3 A4 = 0.33563204 × 10 -3 A4 = -0.18346250 × 10 -2 A6 = 0.47800406 × 10 - 4 A6 = 0.55758065 × 10 -4 A6 = 0.11751226 × 10 -3 A8 = -0.53602476 × 10 -6 A8 = 0.41814929 × 10 -5 A8 = -0.12386343 × 10 -5 6th surface 7th surface 10th surface K = 0 K = 0 K = 0 A4 = -0.12659367 x 10 -2 A4 = -0.77171759 x 10 -3 A4 = 0.72323597 x 10 -3 A6 = 0.57233484 x 10 -4 A6 = -0.31552902 x 10 -4 A6 = -0.55079160 x 10 -5 A8 = -0.25340844 × 10 -6 A8 = 0.37181436 × 10 -6 A8 = -0.16031890 × 10 -5 11 surface 16 surface K = 0 K = 0 A4 = 0.11728471 × 10 -3 A4 = 0.10114791 × 10 - 3 A6 = -0.46239682 x 10 -5 A6 = -0.13207013 x 10 -6 A8 = 0 A8 = 0
【００３０】[0030]
【表３】 [Table 3]
【００３１】第１、第２レンズの各面の像高による非球
面パワーの変化は、図３及び図４に示される。図中、第
１レンズ第１面、第２面のパワーをそれぞれψ1,ψ2、
第２レンズ第１面、第２面のパワーをそれぞれψ3,ψ4
で表している。Changes in the aspherical power depending on the image height of the respective surfaces of the first and second lenses are shown in FIGS. 3 and 4. In the figure, the powers of the first and second surfaces of the first lens are ψ1, ψ2,
The powers of the first and second surfaces of the second lens are ψ3 and ψ4, respectively.
It is represented by.
【００３２】図５及び図６は、実施例1の高倍率時の横
収差図である。横収差は、レンズ第１面より２．９７ｍ
前方の物体面上で光軸からの距離が０ｍｍ、４００ｍ
ｍ、５８０ｍｍ、６８０ｍｍとなる各点からの光束がア
イポイントの位置でどのようになっているかを示してい
る。5 and 6 are lateral aberration diagrams of the first embodiment at high magnification. Lateral aberration is 2.97m from the first lens surface
0mm, 400m from the optical axis on the front object plane
It shows how the luminous flux from each point of m, 580 mm, and 680 mm is at the position of the eye point.
【００３３】図５は、(a)が設計値、すなわち偏心がな
い状態、(b)が第１レンズがレンズ単位で０．１ｍｍ偏
心した場合、(c)が第２レンズがレンズ単位で０．１ｍ
ｍ偏心した場合をそれぞれ示す。In FIG. 5, (a) is a design value, that is, there is no eccentricity, (b) is the case where the first lens is decentered by 0.1 mm per lens, and (c) is the second lens is 0 per lens. .1m
The figures show the cases of m eccentricity.
【００３４】各横収差図は、上から順に画角０°、７．
７°、１１．０°、１２．９°の各点での性能を示し、
一点鎖線がｃ線、実線がｄ線、破線がｇ線を示してい
る。In each lateral aberration diagram, the angles of view are 0 °, 7.
Shows performance at each point of 7 °, 11.0 °, 12.9 °,
The alternate long and short dash line indicates the c line, the solid line indicates the d line, and the broken line indicates the g line.
【００３５】図６は、(a)が第１レンズの第１面が面単
位で０．０５ｍｍ偏心した場合、(b)が第１レンズの第
２面が面単位で０．０５ｍｍ偏心した場合をそれぞれ示
す。In FIG. 6, (a) shows the case where the first surface of the first lens is eccentric by 0.05 mm, and (b) shows the case where the second surface of the first lens is eccentric by 0.05 mm. Are shown respectively.
【００３６】[0036]
【実施例２】図７は実施例２の実像式変倍ファインダー
の低倍率時のレンズ図、図８はその高倍率時のレンズ図
である。実施例２の具体的な数値構成は表４から表６に
示した通りである。実施例２のレンズは、第3,4,5,6,7,
10,11,13,18面が非球面である。各非球面の円錐係数、
非球面係数は、表５に示す通りである。倍率M、半画角
ω、間隔d2,d6,d10は変倍に伴って表６に示すように変
化する。[Embodiment 2] FIG. 7 is a lens diagram of a real image type variable magnification finder of Embodiment 2 at a low magnification, and FIG. 8 is a lens diagram at a high magnification thereof. Specific numerical configurations of Example 2 are as shown in Tables 4 to 6. The lens of Example 2 includes the third, fourth, fifth, sixth, seventh,
The 10,11,13,18 surfaces are aspherical surfaces. Cone coefficient of each aspherical surface,
Aspherical coefficients are as shown in Table 5. The magnification M, the half angle of view ω, and the intervals d2, d6, d10 change as shown in Table 6 as the magnification changes.
【００３７】[0037]
【表４】 [Table 4]
【００３８】[0038]
【表５】 第３面 第４面 第５面 K = 0 K = 0 K = 0 A4 = 0.93324675×10-3 A4 = 0.90455194×10-3 A4 =-0.20794531×10-2 A6 = 0.18433007×10-4 A6 = 0.70627924×10-4 A6 = 0.94284521×10-4 A8 =-0.30157890×10-6 A8 =-0.51958348×10-6 A8 =-0.21366980×10-5 第６面 第７面 第10面 K = 0 K = 0 K = 0 A4 =-0.22098978×10-2 A4 =-0.36067190×10-3 A4 = 0.18557237×10-3 A6 = 0.72579298×10-4 A6 =-0.83711849×10-5 A6 = 0.80469356×10-5 A8 =-0.19858908×10-5 A8 =-0.64414696×10-6 A8 =-0.11070386×10-5 第11面 第13面 第18面 K = 0 K = 0 K = 0 A4 = 0.11752820×10-3 A4 =-0.33307966×10-2 A4 = 0.81399525×10-4 A6 =-0.15426801×10-4 A6 = 0.18300226×10-3 A6 =-0.28696544×10-6 A8 = 0 A8 =-0.33900935×10-5 A8 = 0TABLE 5 third surface fourth surface fifth surface K = 0 K = 0 K = 0 A4 = 0.93324675 × 10 -3 A4 = 0.90455194 × 10 -3 A4 = -0.20794531 × 10 -2 A6 = 0.18433007 × 10 - 4 A6 = 0.70627924 × 10 -4 A6 = 0.94284521 × 10 -4 A8 = -0.30157890 × 10 -6 A8 = -0.51958348 × 10 -6 A8 = -0.21366980 × 10 -5 6th surface 7th surface 10th surface K = 0 K = 0 K = 0 A4 = -0.22098978 × 10 -2 A4 = -0.306 67190 × 10 -3 A4 = 0.18557237 × 10 -3 A6 = 0.72579298 × 10 -4 A6 = -0.83711849 × 10 -5 A6 = 0.80469356 × 10 -5 A8 = -0.19858908 × 10 -5 A8 = -0.64414696 × 10 -6 A8 = -0.11070386 × 10 -5 11 surface 13 surface 18 surface K = 0 K = 0 K = 0 A4 = 0.11752820 × 10 - 3 A4 = -0.33307966 x 10 -2 A4 = 0.81399525 x 10 -4 A6 = -0.15426801 x 10 -4 A6 = 0.18300226 x 10 -3 A6 = -0.28696544 x 10 -6 A8 = 0 A8 = -0.33900 935 x 10 -5 A8 = 0
【００３９】[0039]
【表６】 [Table 6]
【００４０】第１、第２レンズの各面の像高による非球
面パワーの変化は、図９及び図１０に示される。The changes in the aspherical power depending on the image height of the respective surfaces of the first and second lenses are shown in FIGS. 9 and 10.
【００４１】図１１及び図１２は、実施例２の高倍率時
の横収差図である。図１１は、(a)が設計値、(b)が第１
レンズがレンズ単位で０．１ｍｍ偏心した場合、(c)が
第２レンズがレンズ単位で０．１ｍｍ偏心した場合をそ
れぞれ示す。図１２は、(a)が第１レンズの第１面が面
単位で０．０５ｍｍ偏心した場合、(b)が第１レンズの
第２面が面単位で０．０５ｍｍ偏心した場合をそれぞれ
示す。11 and 12 are lateral aberration diagrams of the second embodiment at high magnification. In FIG. 11, (a) is the design value and (b) is the first value.
When the lens is decentered by 0.1 mm for each lens, (c) shows the case where the second lens is decentered by 0.1 mm for each lens. FIG. 12A shows the case where the first surface of the first lens is eccentric by 0.05 mm per surface unit, and FIG. 12B shows the case where the second surface of the first lens is eccentric by 0.05 mm per surface unit. .
【００４２】[0042]
【実施例３】図１３は実施例３の実像式変倍ファインダ
ーの低倍率時のレンズ図、図１４はその高倍率時のレン
ズ図である。実施例３の具体的な数値構成は表７から表
９に示した通りである。実施例３のレンズは、第3,4,5,
6,7,10,11,13,18面が非球面である。各非球面の円錐係
数、非球面係数は、表８に示す通りである。倍率M、半
画角ω、間隔d6,d10は変倍に伴って表９に示すように変
化する。[Third Embodiment] FIG. 13 is a lens diagram of a real image type variable power finder of a third embodiment at a low magnification, and FIG. 14 is a lens diagram at a high magnification thereof. Specific numerical configurations of Example 3 are as shown in Tables 7 to 9. The lens of Example 3 includes the third, fourth, fifth,
The 6,7,10,11,13,18 surfaces are aspherical surfaces. The conical coefficient and aspherical surface coefficient of each aspherical surface are as shown in Table 8. The magnification M, the half angle of view ω, and the intervals d6 and d10 change as shown in Table 9 as the magnification changes.
【００４３】[0043]
【表７】 [Table 7]
【００４４】[0044]
【表８】 第３面 第４面 第５面 K = 0 K = 0 K = 0 A4 = 0.11894340×10-2 A4 = 0.14455307×10-2 A4 =-0.14194920×10-2 A6 =-0.16465858×10-5 A6 = 0.14253204×10-4 A6 = 0.35202729×10-5 A8 = 0.84510254×10-7 A8 = 0.45924602×10-6 A8 = 0.37447599×10-6 第６面 第７面 第10面 K = 0 K = 0 K = 0 A4 =-0.17219345×10-2 A4 =-0.36067190×10-3 A4 = 0.18557237×10-3 A6 = 0.53309818×10-5 A6 =-0.83711849×10-5 A6 = 0.80469356×10-5 A8 = 0.81192110×10-6 A8 =-0.64414696×10-6 A8 =-0.11070386×10-5 第11面 第13面 第18面 K = 0 K = 0 K = 0 A4 = 0.11752820×10-3 A4 =-0.33307966×10-2 A4 = 0.81399525×10-4 A6 =-0.15426801×10-4 A6 = 0.18300226×10-3 A6 =-0.28696544×10-6 A8 = 0 A8 =-0.33900935×10-5 A8 = 0[Table 8] Third surface Fourth surface Fifth surface K = 0 K = 0 K = 0 A4 = 0.11894340 × 10 -2 A4 = 0.14455307 × 10 -2 A4 = -0.14194920 × 10 -2 A6 = -0.16465858 × 10 -5 A6 = 0.14253204 × 10 -4 A6 = 0.35202729 × 10 -5 A8 = 0.84510254 × 10 -7 A8 = 0.45924602 × 10 -6 A8 = 0.37447599 × 10 -6 6th surface 7th surface 10th surface K = 0 K = 0 K = 0 A4 = -0.17219345 x 10 -2 A4 = -0.30667190 x 10 -3 A4 = 0.18557237 x 10 -3 A6 = 0.53309818 x 10 -5 A6 = -0.83711849 x 10 -5 A6 = 0.80469356 x 10 -5 A8 = 0.81192110 × 10 -6 A8 = -0.644146696 × 10 -6 A8 = -0.11070386 × 10 -5 11th surface 13th surface 18th surface K = 0 K = 0 K = 0 A4 = 0.11752820 × 10 -3 A4 = -0.33307966 × 10 -2 A4 = 0.81399525 × 10 -4 A6 = -0.15426801 × 10 -4 A6 = 0.18300226 × 10 -3 A6 = -0.28696544 × 10 -6 A8 = 0 A8 = -0.33900935 × 10 -5 A8 = 0
【００４５】[0045]
【表９】 [Table 9]
【００４６】第１、第２レンズの各面の像高による非球
面パワーの変化は、図１５及び図１６に示される。Changes in the aspherical power depending on the image height of the respective surfaces of the first and second lenses are shown in FIGS. 15 and 16.
【００４７】図１７及び図１８は、実施例３の高倍率時
の横収差図である。図１７は、(a)が設計値、(b)が第１
レンズがレンズ単位で０．１ｍｍ偏心した場合、(c)が
第２レンズがレンズ単位で０．１ｍｍ偏心した場合をそ
れぞれ示す。図１８は、(a)が第１レンズの第１面が面
単位で０．０５ｍｍ偏心した場合、(b)が第１レンズの
第２面が面単位で０．０５ｍｍ偏心した場合をそれぞれ
示す。17 and 18 are lateral aberration diagrams of Example 3 at high magnification. In FIG. 17, (a) is the design value and (b) is the first value.
When the lens is decentered by 0.1 mm for each lens, (c) shows the case where the second lens is decentered by 0.1 mm for each lens. FIG. 18A shows a case where the first surface of the first lens is eccentric by 0.05 mm per surface unit, and FIG. 18B shows a case where the second surface of the first lens is eccentric about 0.05 mm per surface unit. .
【００４８】[0048]
【実施例４】図１９は実施例４の実像式変倍ファインダ
ーの低倍率時のレンズ図、図２０はその高倍率時のレン
ズ図である。実施例４の具体的な数値構成は表１０から
表１２に示した通りである。実施例４のレンズは、第3,
4,6,7,10,11,16面が非球面である。各非球面の円錐係
数、非球面係数は、表１１に示す通りである。倍率M、
半画角ω、間隔d2,d6,d10は変倍に伴って表１２に示す
ように変化する。[Embodiment 4] FIG. 19 is a lens diagram of a real image type variable magnification finder of Embodiment 4 at a low magnification, and FIG. 20 is a lens diagram at a high magnification thereof. Specific numerical configurations of Example 4 are as shown in Tables 10 to 12. The lens of Example 4 includes the third,
The 4,6,7,10,11,16 surfaces are aspherical surfaces. Table 11 shows the conical coefficient and the aspherical coefficient of each aspherical surface. Magnification M,
The half angle of view ω and the intervals d2, d6, d10 change as shown in Table 12 as the magnification changes.
【００４９】[0049]
【表１０】 [Table 10]
【００５０】[0050]
【表１１】 第３面 第４面 第６面 K = 0 K = 0 K = 0 A4 = 0.14395499×10-2 A4 = 0.17289019×10-2 A4 =-0.18272497×10-3 A6 = 0.66191269×10-5 A6 = 0.40004633×10-4 A6 =-0.24391092×10-4 A8 = 0.43410326×10-8 A8 = 0.25275607×10-5 A8 = 0.56056403×10-6 第７面 第10面 第11面 K = 0 K = 0 K = 0 A4 =-0.83060514×10-3 A4 = 0.50187460×10-3 A4 = 0.41050257×10-3 A6 =-0.22185483×10-4 A6 = 0.18080908×10-4 A6 =-0.11104580×10-4 A8 =-0.39762888×10-6 A8 =-0.39768757×10-5 A8 = 0 第16面 K = 0 A4 = 0.96054430×10-4 A6 =-0.51280855×10-6 A8 = 0[Table 11] Third surface Fourth surface Sixth Surface K = 0 K = 0 K = 0 A4 = 0.14395499 × 10 -2 A4 = 0.17289019 × 10 -2 A4 = -0.18272497 × 10 -3 A6 = 0.66191269 × 10 - 5 A6 = 0.40004633 × 10 -4 A6 = -0.24391092 × 10 -4 A8 = 0.43410326 × 10 -8 A8 = 0.25275607 × 10 -5 A8 = 0.56056403 × 10 -6 7th surface 10th surface 11th surface K = 0 K = 0 K = 0 A4 = -0.83060514 x 10 -3 A4 = 0.50187460 x 10 -3 A4 = 0.41050257 x 10 -3 A6 = -0.22185483 x 10 -4 A6 = 0.18080908 x 10 -4 A6 = -0.11104580 x 10 -4 A8 = -0.39762888 × 10 -6 A8 = -0.39768757 × 10 -5 A8 = 0 16th surface K = 0 A4 = 0.96054430 × 10 -4 A6 = -0.51280855 × 10 -6 A8 = 0
【００５１】[0051]
【表１２】 [Table 12]
【００５２】第１、第２レンズの各面の像高による非球
面パワーの変化は、図２１及び図２２に示される。The changes in the aspherical power depending on the image heights of the respective surfaces of the first and second lenses are shown in FIGS. 21 and 22.
【００５３】図２３及び図２４は、実施例４の高倍率時
の横収差図である。図２３は、(a)が設計値、(b)が第１
レンズがレンズ単位で０．１ｍｍ偏心した場合、(c)が
第２レンズがレンズ単位で０．１ｍｍ偏心した場合をそ
れぞれ示す。図２４は、(a)が第１レンズの第１面が面
単位で０．０５ｍｍ偏心した場合、(b)が第１レンズの
第２面が面単位で０．０５ｍｍ偏心した場合をそれぞれ
示す。23 and 24 are lateral aberration diagrams of the fourth embodiment at high magnification. In FIG. 23, (a) is the design value and (b) is the first value.
When the lens is decentered by 0.1 mm for each lens, (c) shows the case where the second lens is decentered by 0.1 mm for each lens. 24A shows a case where the first surface of the first lens is eccentric by 0.05 mm per surface unit, and FIG. 24B shows a case where the second surface of the first lens is eccentric about 0.05 mm per surface unit. .
【００５４】表１３は、上述した条件式の値と各実施例
との対応を示したものである。Table 13 shows the correspondence between the values of the above-mentioned conditional expressions and the respective embodiments.
【００５５】[0055]
【表１３】 実施例１ 実施例２ 実施例３ 実施例４ ＳＦ1 -0.71 -0.47 -0.46 -0.695 ｜ＳＦ2｜ 3.62 1.94 1.63 3.48 ｜ＳＰ1｜ 0.070 0.066 0.065 0.070 ｜ＳＰ2｜ 0.123 0.106 0.093 0.124 ｜ＳＰ3｜ 0.026 0.046 0.068 0.026 ｜ＳＰ4｜ 0.018 0.067 0.070 0.018Table 13 Example 1 Example 2 Example 3 Example 4 SF1 -0.71 -0.47 -0.46 -0.695 ｜ SF2 ｜ 3.62 1.94 1.63 3.48 ｜ SP1 ｜ 0.070 0.066 0.065 0.070 ｜ SP2 ｜ 0.123 0.106 0.093 0.124 ｜ SP3 ｜ 0.026 0.046 0.068 0.026 ｜ SP4 ｜ 0.018 0.067 0.070 0.018
【００５６】次に、実施例との偏心による性能劣化を比
較するため、実施例の各条件を満たさない比較例を２例
説明する。Next, in order to compare the performance deterioration due to the eccentricity with the embodiment, two comparative examples which do not satisfy each condition of the embodiment will be described.
【００５７】[0057]
【比較例１】図２５は比較例１の実像式変倍ファインダ
ーの低倍率時のレンズ図、図２６はその高倍率時のレン
ズ図である。比較例１の具体的な数値構成は表１４から
表１６に示した通りである。比較例１のレンズは、第3,
4,6,7,10,11,13,18面が非球面である。各非球面の円錐
係数、非球面係数は、表１５に示す通りである。倍率
M、半画角ω、間隔d2,d6,d10は変倍に伴って表１６に示
すように変化する。COMPARATIVE EXAMPLE 1 FIG. 25 is a lens diagram of the real image type variable magnification finder of Comparative Example 1 at a low magnification, and FIG. 26 is a lens diagram at a high magnification thereof. Specific numerical configurations of Comparative Example 1 are as shown in Tables 14 to 16. The lens of Comparative Example 1 has a third,
The 4,6,7,10,11,13,18 surface is aspherical. Table 15 shows the conical coefficient and the aspherical surface coefficient of each aspherical surface. magnification
M, the half angle of view ω, and the intervals d2, d6, d10 change as shown in Table 16 as the magnification changes.
【００５８】[0058]
【表１４】 [Table 14]
【００５９】[0059]
【表１５】 第３面 第４面 第５面 K = 0 K = 0 K = 0 A4 = 0.13304085×10-2 A4 = 0.20042032×10-2 A4 =-0.15509821×10-3 A6 = 0.50187403×10-4 A6 = 0.65821787×10-4 A6 = 0.52784354×10-4 A8 =-0.10191957×10-5 A8 = 0.48330579×10-5 A8 =-0.73439660×10-6 第６面 第７面 第10面 K = 0 K = 0 K = 0 A4 =-0.60380727×10-3 A4 = 0.45866792×10-3 A4 = 0.78514644×10-3 A6 = 0.10815769×10-4 A6 = 0.36680910×10-4 A6 = 0.61706389×10-4 A8 =-0.99348329×10-6 A8 =-0.78931843×10-6 A8 =-0.23187680×10-6 第11面 第13面 第18面 K = 0 K = 0 K = 0 A4 =-0.73107130×10-5 A4 =-0.82148229×10-3 A4 = 0.16076273×10-3 A6 = 0.14307795×10-5 A6 = 0.13529496×10-4 A6 =-0.54013387×10-6 A8 = 0 A8 =-0.54305623×10-6 A8 = 0[Table 15] Third surface Fourth surface Fifth surface K = 0 K = 0 K = 0 A4 = 0.13304085 × 10 -2 A4 = 0.20042032 × 10 -2 A4 = -0.15509821 × 10 -3 A6 = 0.50187403 × 10 - 4 A6 = 0.65821787 × 10 -4 A6 = 0.52784354 × 10 -4 A8 = -0.10191957 × 10 -5 A8 = 0.48330579 × 10 -5 A8 = -0.73439660 × 10 -6 6th surface 7th surface 10th surface K = 0 K = 0 K = 0 A4 = -0.60380727 × 10 -3 A4 = 0.45866792 × 10 -3 A4 = 0.78514644 × 10 -3 A6 = 0.10815769 × 10 -4 A6 = 0.36680910 × 10 -4 A6 = 0.61706389 × 10 -4 A8 = -0.99348329 × 10 -6 A8 = -0.78931843 × 10 -6 A8 = -0.23187680 × 10 -6 11th surface 13th surface 18th surface K = 0 K = 0 K = 0 A4 = -0.73107 130 × 10 -5 A4 = -0.82148229 × 10 -3 A4 = 0.16076273 × 10 -3 A6 = 0.14307795 × 10 -5 A6 = 0.13529496 × 10 -4 A6 = -0.54013387 × 10 -6 A8 = 0 A8 = -0.54305623 × 10 -6 A8 = 0
【００６０】[0060]
【表１６】 [Table 16]
【００６１】第１、第２レンズの各面の像高による非球
面パワーの変化は、図２７及び図２８に示される。The changes in the aspherical power depending on the image height of the respective surfaces of the first and second lenses are shown in FIGS. 27 and 28.
【００６２】図２９及び図３０は、比較例１の高倍率時
の横収差図である。図２９は、(a)が設計値、(b)が第１
レンズがレンズ単位で０．１ｍｍ偏心した場合、(c)が
第２レンズがレンズ単位で０．１ｍｍ偏心した場合をそ
れぞれ示す。図３０は、(a)が第１レンズの第１面が面
単位で０．０５ｍｍ偏心した場合、(b)が第１レンズの
第２面が面単位で０．０５ｍｍ偏心した場合をそれぞれ
示す。29 and 30 are lateral aberration diagrams of Comparative Example 1 at high magnification. In FIG. 29, (a) is the design value and (b) is the first value.
When the lens is decentered by 0.1 mm for each lens, (c) shows the case where the second lens is decentered by 0.1 mm for each lens. FIG. 30 shows a case where the first surface of the first lens is eccentric by 0.05 mm on a surface unit basis, and FIG. 30B shows a case where the second surface of the first lens is eccentric on a surface unit basis by 0.05 mm. .
【００６３】表１７は、比較例１と条件式との関係を示
す。Table 17 shows the relationship between Comparative Example 1 and the conditional expression.
【００６４】[0064]
【表１７】 [Table 17]
【００６５】比較例１は、条件(4)(5)を満たしておら
ず、このために横収差図に見られるように偏心による光
学性能の劣化が著しい。Comparative Example 1 does not satisfy the conditions (4) and (5), and as a result, as shown in the lateral aberration diagram, the optical performance is significantly deteriorated due to decentering.
【００６６】[0066]
【比較例２】図３１は比較例２の実像式変倍ファインダ
ーの低倍率時のレンズ図、図３２はその高倍率時のレン
ズ図である。比較例２の具体的な数値構成は表１８から
表２０に示した通りである。比較例１のレンズは、第3,
4,6,7,10,11,13,18面が非球面である。各非球面の円錐
係数、非球面係数は、表１９に示す通りである。倍率
M、半画角ω、間隔d2,d6,d10は変倍に伴って表２０に示
すように変化する。COMPARATIVE EXAMPLE 2 FIG. 31 is a lens diagram of the real image type variable power finder of Comparative Example 2 at a low magnification, and FIG. 32 is a lens diagram at a high magnification thereof. Specific numerical configurations of Comparative Example 2 are as shown in Tables 18 to 20. The lens of Comparative Example 1 has a third,
The 4,6,7,10,11,13,18 surface is aspherical. The conical coefficient and aspherical surface coefficient of each aspherical surface are as shown in Table 19. magnification
M, the half angle of view ω, and the intervals d2, d6, and d10 change as shown in Table 20 as the magnification changes.
【００６７】[0067]
【表１８】 [Table 18]
【００６８】[0068]
【表１９】 第３面 第４面 第５面 K = 0 K = 0 K = 0 A4 = 0.14976894×10-2 A4 = 0.15857079×10-2 A4 =-0.52884380×10-2 A6 = 0.25977485×10-4 A6 = 0.10468463×10-3 A6 = 0.32149309×10-3 A8 =-0.51104385×10-6 A8 = 0.23705531×10-5 A8 =-0.89057325×10-5 第６面 第７面 第10面 K = 0 K = 0 K = 0 A4 =-0.73605553×10-2 A4 = 0.20012475×10-4 A4 = 0.37204494×10-3 A6 = 0.37675450×10-3 A6 = 0.40581101×10-4 A6 = 0.21635942×10-4 A8 =-0.16713831×10-4 A8 =-0.93440578×10-6 A8 = 0.51862788×10-6 第11面 第13面 第18面 K = 0 K = 0 K = 0 A4 =-0.65604440×10-4 A4 =-0.28313026×10-2 A4 = 0.84839627×10-4 A6 =-0.77682462×10-5 A6 = 0.12174047×10-3 A6 =-0.12225598×10-6 A8 = 0 A8 =-0.22515717×10-5 A8 = 0[Table 19] Third surface Fourth surface Fifth surface K = 0 K = 0 K = 0 A4 = 0.14976894 × 10 -2 A4 = 0.15857079 × 10 -2 A4 = -0.52884380 × 10 -2 A6 = 0.25977485 × 10 - 4 A6 = 0.10468463 × 10 -3 A6 = 0.32149309 × 10 -3 A8 = -0.51104385 × 10 -6 A8 = 0.23705531 × 10 -5 A8 = -0.89057325 × 10 -5 6th surface 7th surface 10th surface K = 0 K = 0 K = 0 A4 = -0.73605553 × 10 -2 A4 = 0.20012475 × 10 -4 A4 = 0.37204494 × 10 -3 A6 = 0.37675450 × 10 -3 A6 = 0.40581101 × 10 -4 A6 = 0.21635942 × 10 -4 A8 = -0.16713831 × 10 -4 A8 = -0.93440578 × 10 -6 A8 = 0.51862788 × 10 -6 11th surface 13th surface 18th surface K = 0 K = 0 K = 0 A4 = -0.65604440 × 10 -4 A4 = -0.28313026 x 10 -2 A4 = 0.84839627 x 10 -4 A6 = -0.77682462 x 10 -5 A6 = 0.12174047 x 10 -3 A6 = -0.12225598 x 10 -6 A8 = 0 A8 = -0.22515717 x 10 -5 A8 = 0
【００６９】[0069]
【表２０】 [Table 20]
【００７０】第１、第２レンズの各面の像高による非球
面パワーの変化は、図２７及び図２８に示される。The changes in the aspherical power depending on the image heights of the respective surfaces of the first and second lenses are shown in FIGS. 27 and 28.
【００７１】図２９及び図３０は、比較例１の高倍率時
の横収差図である。図２９は、(a)が設計値、(b)が第１
レンズがレンズ単位で０．１ｍｍ偏心した場合、(c)が
第２レンズがレンズ単位で０．１ｍｍ偏心した場合をそ
れぞれ示す。図３０は、(a)が第１レンズの第１面が面
単位で０．０５ｍｍ偏心した場合、(b)が第１レンズの
第２面が面単位で０．０５ｍｍ偏心した場合をそれぞれ
示す。29 and 30 are lateral aberration diagrams of Comparative Example 1 at high magnification. In FIG. 29, (a) is the design value and (b) is the first value.
When the lens is decentered by 0.1 mm for each lens, (c) shows the case where the second lens is decentered by 0.1 mm for each lens. FIG. 30 shows a case where the first surface of the first lens is eccentric by 0.05 mm on a surface unit basis, and FIG. 30B shows a case where the second surface of the first lens is eccentric on a surface unit basis by 0.05 mm. .
【００７２】表２１は、比較例２と条件式との関係を示
す。Table 21 shows the relationship between Comparative Example 2 and the conditional expression.
【００７３】[0073]
【表２１】 [Table 21]
【００７４】比較例２は、条件(2),(6),(7)を満たして
おらず、そのために偏心による光学性能の劣化が著し
い。Comparative Example 2 does not satisfy the conditions (2), (6) and (7), so that the optical performance is significantly deteriorated due to decentering.
【００７５】[0075]
【発明の効果】以上説明したように、この発明によれ
ば、レンズが設計値に対して偏心等の誤差を持つ場合に
も光学性能の劣化が小さい非球面レンズ系を提供するこ
とができる。As described above, according to the present invention, it is possible to provide an aspherical lens system in which deterioration of optical performance is small even when the lens has an error such as decentering with respect to a design value.
【図１】 実施例1の実像式変倍ファインダーの高倍率
時のレンズ図である。FIG. 1 is a lens diagram of a real image type variable power viewfinder of Example 1 at a high magnification.
【図２】 実施例1の実像式変倍ファインダーの低倍率
時のレンズ図である。FIG. 2 is a lens diagram of a real image type variable power viewfinder of Example 1 at a low magnification.
【図３】 実施例１のファインダーの第１レンズの像高
によるパワーの変化を示すグラフである。FIG. 3 is a graph showing a change in power depending on the image height of the first lens of the finder of Example 1.
【図４】 実施例１のファインダーの第２レンズの像高
によるパワーの変化を示すグラフである。FIG. 4 is a graph showing a change in power depending on the image height of the second lens of the finder of Example 1.
【図５】 実施例１のファインダーの高倍率時の横収差
図であり、(a)は設計値、(b)は第１レンズが偏心した場
合、(c)は第２レンズが偏心した場合を示す。5A and 5B are lateral aberration diagrams of the finder of Example 1 at high magnification, where FIG. 5A is a design value, FIG. 5B is when the first lens is eccentric, and FIG. 5C is when the second lens is eccentric. Indicates.
【図６】 実施例１のファインダーの高倍率時の横収差
図であり、(a)は第１レンズの第１面が偏心した場合、
(c)は第１レンズの第２面が偏心した場合を示す。FIG. 6 is a lateral aberration diagram of the finder of Example 1 at a high magnification, (a) shows a case where the first surface of the first lens is decentered,
(c) shows the case where the second surface of the first lens is decentered.
【図７】 実施例２の実像式変倍ファインダーの高倍率
時のレンズ図である。FIG. 7 is a lens diagram of the real image type variable power finder of Example 2 at a high magnification.
【図８】 実施例２の実像式変倍ファインダーの低倍率
時のレンズ図である。FIG. 8 is a lens diagram of a real image type variable power viewfinder of Example 2 at a low magnification.
【図９】 実施例２のファインダーの第１レンズの像高
によるパワーの変化を示すグラフである。9 is a graph showing a change in power depending on the image height of the first lens of the finder of Example 2. FIG.
【図１０】 実施例２のファインダーの第２レンズの像
高によるパワーの変化を示すグラフである。FIG. 10 is a graph showing a change in power depending on the image height of the second lens of the finder of Example 2.
【図１１】 実施例２のファインダーの高倍率時の横収
差図であり、(a)は設計値、(b)は第１レンズが偏心した
場合、(c)は第２レンズが偏心した場合を示す。FIG. 11 is a lateral aberration diagram of the finder of Example 2 at a high magnification, where (a) is a design value, (b) is the case where the first lens is decentered, and (c) is the case where the second lens is decentered. Indicates.
【図１２】 実施例２のファインダーの高倍率時の横収
差図であり、(a)は第１レンズの第１面が偏心した場
合、(c)は第１レンズの第２面が偏心した場合を示す。12A and 12B are lateral aberration diagrams of the finder of Example 2 at high magnification, where FIG. 12A is a case where the first surface of the first lens is decentered, and FIG. 12C is a case where the second surface of the first lens is decentered. Indicate the case.
【図１３】 実施例３の実像式変倍ファインダーの高倍
率時のレンズ図である。FIG. 13 is a lens diagram of the real image type variable power finder of Example 3 at a high magnification.
【図１４】 実施例３の実像式変倍ファインダーの低倍
率時のレンズ図である。FIG. 14 is a lens diagram of a real image type variable power viewfinder of Example 3 at a low magnification.
【図１５】 実施例３のファインダーの第１レンズの像
高によるパワーの変化を示すグラフである。FIG. 15 is a graph showing a change in power depending on the image height of the first lens of the finder of Example 3.
【図１６】 実施例３のファインダーの第２レンズの像
高によるパワーの変化を示すグラフである。16 is a graph showing a change in power depending on the image height of the second lens of the finder of Example 3. FIG.
【図１７】 実施例３のファインダーの高倍率時の横収
差図であり、(a)は設計値、(b)は第１レンズが偏心した
場合、(c)は第２レンズが偏心した場合を示す。17A and 17B are lateral aberration diagrams of the finder of Example 3 at a high magnification, where (a) is a design value, (b) is a case where the first lens is eccentric, and (c) is a case where the second lens is eccentric. Indicates.
【図１８】 実施例３のファインダーの高倍率時の横収
差図であり、(a)は第１レンズの第１面が偏心した場
合、(c)は第１レンズの第２面が偏心した場合を示す。18A and 18B are lateral aberration diagrams of the finder of Example 3 at a high magnification, where FIG. 18A is the case where the first surface of the first lens is decentered, and FIG. 18C is the case where the second surface of the first lens is decentered. Indicate the case.
【図１９】 実施例４の実像式変倍ファインダーの高倍
率時のレンズ図である。FIG. 19 is a lens diagram of the real image type variable power finder of Example 4 at high magnification.
【図２０】 実施例４の実像式変倍ファインダーの低倍
率時のレンズ図である。FIG. 20 is a lens diagram of the real image type variable power viewfinder of Example 4 at a low magnification.
【図２１】 実施例４のファインダーの第１レンズの像
高によるパワーの変化を示すグラフである。FIG. 21 is a graph showing a change in power depending on the image height of the first lens of the finder of Example 4.
【図２２】 実施例４のファインダーの第２レンズの像
高によるパワーの変化を示すグラフである。22 is a graph showing a change in power depending on the image height of the second lens of the finder of Example 4. FIG.
【図２３】 実施例４のファインダーの高倍率時の横収
差図であり、(a)は設計値、(b)は第１レンズが偏心した
場合、(c)は第２レンズが偏心した場合を示す。23A and 23B are lateral aberration diagrams of the finder of Example 4 at high magnification, where FIG. 23A is a design value, FIG. 23B is a case where the first lens is decentered, and FIG. 23C is a case where the second lens is decentered. Indicates.
【図２４】 実施例４のファインダーの高倍率時の横収
差図であり、(a)は第１レンズの第１面が偏心した場
合、(c)は第１レンズの第２面が偏心した場合を示す。FIG. 24 is a lateral aberration diagram of the finder of Example 4 at a high magnification, (a) shows the case where the first surface of the first lens is eccentric, and (c) shows the case where the second surface of the first lens is eccentric. Indicate the case.
【図２５】 比較例１の実像式変倍ファインダーの高倍
率時のレンズ図である。25 is a lens diagram of the real image type variable power viewfinder of Comparative Example 1 at a high magnification. FIG.
【図２６】 比較例１の実像式変倍ファインダーの低倍
率時のレンズ図である。FIG. 26 is a lens diagram of a real image type variable power viewfinder of Comparative Example 1 at a low magnification.
【図２７】 比較例１のファインダーの第１レンズの像
高によるパワーの変化を示すグラフである。27 is a graph showing a change in power depending on the image height of the first lens of the finder of Comparative Example 1. FIG.
【図２８】 比較例１のファインダーの第２レンズの像
高によるパワーの変化を示すグラフである。28 is a graph showing a change in power depending on the image height of the second lens of the finder of Comparative Example 1. FIG.
【図２９】 比較例１のファインダーの高倍率時の横収
差図であり、(a)は設計値、(b)は第１レンズが偏心した
場合、(c)は第２レンズが偏心した場合を示す。29A and 29B are lateral aberration diagrams of the finder of Comparative Example 1 at a high magnification, where (a) is a design value, (b) is a case where the first lens is decentered, and (c) is a case where the second lens is decentered. Indicates.
【図３０】 比較例１のファインダーの高倍率時の横収
差図であり、(a)は第１レンズの第１面が偏心した場
合、(c)は第１レンズの第２面が偏心した場合を示す。30 is a lateral aberration diagram of the finder of Comparative Example 1 at a high magnification, (a) shows the case where the first surface of the first lens is eccentric, and (c) shows the case where the second surface of the first lens is eccentric. Indicate the case.
【図３１】 比較例２の実像式変倍ファインダーの高倍
率時のレンズ図である。31 is a lens diagram of the real image type variable power viewfinder of Comparative Example 2 at a high magnification. FIG.
【図３２】 比較例２の実像式変倍ファインダーの低倍
率時のレンズ図である。32 is a lens diagram of a real image type variable power viewfinder of Comparative Example 2 at a low magnification. FIG.
【図３３】 比較例２のファインダーの第１レンズの像
高によるパワーの変化を示すグラフである。FIG. 33 is a graph showing a change in power depending on the image height of the first lens of the finder of Comparative Example 2.
【図３４】 比較例２のファインダーの第２レンズの像
高によるパワーの変化を示すグラフである。34 is a graph showing a change in power depending on the image height of the second lens of the finder of Comparative Example 2. FIG.
【図３５】 比較例２のファインダーの高倍率時の横収
差図であり、(a)は設計値、(b)は第１レンズが偏心した
場合、(c)は第２レンズが偏心した場合を示す。35 is a lateral aberration diagram of the finder of Comparative Example 2 at a high magnification, where (a) is a design value, (b) is the case where the first lens is eccentric, and (c) is the case where the second lens is eccentric. Indicates.
【図３６】 比較例２のファインダーの高倍率時の横収
差図であり、(a)は第１レンズの第１面が偏心した場
合、(c)は第１レンズの第２面が偏心した場合を示す。FIG. 36 is a lateral aberration diagram of the finder of Comparative Example 2 at a high magnification, where (a) is the eccentricity of the first surface of the first lens and (c) is the eccentricity of the second surface of the first lens. Indicate the case.
【図３７】 偏心の種類を示す説明図であり、(a)は面
単位の偏心、(b)はレンズ単位の偏心を示す。37A and 37B are explanatory diagrams showing types of eccentricity, where FIG. 37A shows eccentricity in plane units, and FIG. 37B shows eccentricity in lens units.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年１１月２４日[Submission date] November 24, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項５[Name of item to be corrected] Claim 5
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項６[Name of item to be corrected] Claim 6
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００３２[Name of item to be corrected] 0032
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００３２】図５及び図６は、実施例1の高倍率時の横
収差図である。横収差は、レンズ第１面より２．９７ｍ
前方の物体面上で光軸からの距離が０ｍｍ、４００ｍ
ｍ、５８０ｍｍ、６８０ｍｍとなる各点からの光束がア
イポイントの位置でどのようになっているかを示してい
る。横軸は入射瞳座標、縦軸は観察者の眼に入射する光
線角度であり、主光線の角度を原点として表示してい
る。単位はdegreeである。5 and 6 are lateral aberration diagrams of the first embodiment at high magnification. Lateral aberration is 2.97m from the first lens surface
0mm, 400m from the optical axis on the front object plane
It shows how the luminous flux from each point of m, 580 mm, and 680 mm is at the position of the eye point. The horizontal axis is the entrance pupil coordinate, and the vertical axis is the angle of the light ray incident on the observer's eye. The angle of the principal ray is displayed as the origin. The unit is degree.
Claims (7)
とも一方の面が非球面である第２レンズとを有し、か
つ、以下の条件を満たすことを特徴とする非球面レンズ
系。 ｜ＳＦ1｜＜１ ０≦｜｜ＳＦ1｜−｜ＳＦ2｜｜≦４ ただし、 ＳＦ1は第１レンズのシェイプファクター、 ＳＦ2は第２レンズのシェイプファクターである。1. An aspherical lens system comprising a first lens having aspherical surfaces on both sides and a second lens having at least one surface being an aspherical surface, and satisfying the following conditions. . | SF1 | <10 ≦ || SF1 | − | SF2 || ≦ 4 where SF1 is the shape factor of the first lens and SF2 is the shape factor of the second lens.
負レンズであり、前記第１レンズが最も物体側に配置さ
れていることを特徴とする請求項１に記載の非球面レン
ズ系。2. The aspherical lens system according to claim 1, wherein both the first lens and the second lens are negative lenses, and the first lens is disposed closest to the object side.
第２レンズ群とが配列し、両レンズ群の間隔を変化させ
て結像倍率を変化させる結像光学系を有する非球面レン
ズ系において、 前記第１レンズ群は、１枚の両面非球面の第１レンズ
と、少なくとも一方の面が非球面である第２レンズとを
有し、かつ、以下の条件を満たすことを特徴とする非球
面レンズ系。 ｜ＳＦ1｜＜１ ０≦｜｜ＳＦ1｜−｜ＳＦ2｜｜≦４ ただし、 ＳＦ1は第１レンズのシェイプファクター、 ＳＦ2は第２レンズのシェイプファクターである。3. A non-image-forming optical system in which a negative first lens group and a positive second lens group are arranged in order from the object side, and an imaging magnification is changed by changing a distance between both lens groups. In the spherical lens system, the first lens group includes one first lens having aspherical surfaces on both sides and a second lens having at least one surface being an aspherical surface, and satisfies the following conditions. Characteristic aspherical lens system. | SF1 | <10 ≦ || SF1 | − | SF2 || ≦ 4 where SF1 is the shape factor of the first lens and SF2 is the shape factor of the second lens.
負レンズであり、前記第１レンズが最も物体側に配置さ
れていることを特徴とする請求項３に記載の非球面レン
ズ系。4. The aspherical lens system according to claim 3, wherein both the first lens and the second lens are negative lenses, and the first lens is disposed closest to the object side.
として、前記第１、第２レンズの全ての非球面が少なく
とも高倍率時に以下の条件を満たすことを特徴とする請
求項３に記載の非球面レンズ系。 ｜ＳＰ｜≦０．２5. The amount of change in aspherical power within the effective radius is SP.
The aspherical lens system according to claim 3, wherein all the aspherical surfaces of the first and second lenses satisfy the following condition at least at high magnification. | SP | ≤0.2
の非球面パワーの変化量をそれぞれＳＰ1、ＳＰ2、ＳＰ
3、ＳＰ4として、少なくとも高倍率時に以下の条件を満
たすことを特徴とする請求項３に記載の非球面レンズ
系。 ｜ＳＰ1｜≦０．１ ｜ＳＰ2｜≦０．２ ｜ＳＰ3｜≦０．０４ ｜ＳＰ4｜≦０．０６6. The amount of change in aspherical power within the effective radius of each surface of the first and second lenses is SP1, SP2, SP, respectively.
The aspherical lens system according to claim 3, wherein the following conditions are satisfied at least at high magnification as 3 and SP4. | SP1 | ≤0.1 | SP2 | ≤0.2 | SP3 | ≤0.04 | SP4 | ≤0.06
像を観察する接眼レンズ系を有することを特徴とする請
求項３に記載の非球面レンズ系。7. The aspherical lens system according to claim 3, further comprising an eyepiece lens system for observing an image formed by the imaging optical system.
Priority Applications (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4227567A JPH0682694A (en) | 1992-08-26 | 1992-08-26 | Aspherical lens system |
| DE4245030A DE4245030B4 (en) | 1991-11-25 | 1992-11-25 | Variable power view finder for camera |
| GB9422930A GB2282461A (en) | 1991-11-25 | 1992-11-25 | Variable power view finder |
| DE4239603A DE4239603B4 (en) | 1991-11-25 | 1992-11-25 | Variable power view finder for camera - has condenser lens between objective lens and image erector assembly |
| US07/981,544 US5410430A (en) | 1991-11-25 | 1992-11-25 | Variable power view finder |
| GB9422936A GB2282462B (en) | 1991-11-25 | 1992-11-25 | Variable power view finder |
| GB9422931A GB2283106A (en) | 1991-11-25 | 1992-11-25 | Variable power view finder |
| GB9422928A GB2282459B (en) | 1991-11-25 | 1992-11-25 | Optical system having a biaspheric lens and an aspheric lens |
| GB9422927A GB2282458A (en) | 1991-11-25 | 1992-11-25 | Variable power view finder |
| GB9422929A GB2282460B (en) | 1991-11-25 | 1992-11-25 | Variable power view finder |
| GB9224736A GB2261744B (en) | 1991-11-25 | 1992-11-25 | Variable power view finder with aspheric lens surfaces |
| US08/356,623 US5541768A (en) | 1991-11-25 | 1994-12-15 | Variable power view finder having aspheric lens surfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4227567A JPH0682694A (en) | 1992-08-26 | 1992-08-26 | Aspherical lens system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0682694A true JPH0682694A (en) | 1994-03-25 |
Family
ID=16862944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4227567A Pending JPH0682694A (en) | 1991-11-25 | 1992-08-26 | Aspherical lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0682694A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5956178A (en) * | 1996-09-02 | 1999-09-21 | Nikon Corporation | Keplerian variable magnification viewfinder |
| WO2011112119A1 (en) * | 2010-03-11 | 2011-09-15 | Закрытое Акционерное Общество "Импульс" | Projection high-speed objective |
| US10895718B2 (en) | 2019-02-01 | 2021-01-19 | Largan Precision Co., Ltd. | Optical photographing lens assembly, image capturing unit and electronic device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61183613A (en) * | 1985-02-08 | 1986-08-16 | Canon Inc | Zoom lens |
| JPH01257817A (en) * | 1988-04-07 | 1989-10-13 | Minolta Camera Co Ltd | Variable power finder optical system |
| JPH0467113A (en) * | 1990-07-06 | 1992-03-03 | Minolta Camera Co Ltd | Compact zoom lens |
| JPH0478814A (en) * | 1990-07-20 | 1992-03-12 | Minolta Camera Co Ltd | Zoom lens |
| JPH0478813A (en) * | 1990-07-20 | 1992-03-12 | Minolta Camera Co Ltd | Zoom lens |
| JPH04141615A (en) * | 1990-10-02 | 1992-05-15 | Minolta Camera Co Ltd | Compact zoom lens |
| JPH04211214A (en) * | 1989-12-28 | 1992-08-03 | Asahi Optical Co Ltd | Image pickup lens |
| JPH04264413A (en) * | 1991-02-19 | 1992-09-21 | Minolta Camera Co Ltd | Compact zoom lens |
-
1992
- 1992-08-26 JP JP4227567A patent/JPH0682694A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61183613A (en) * | 1985-02-08 | 1986-08-16 | Canon Inc | Zoom lens |
| JPH01257817A (en) * | 1988-04-07 | 1989-10-13 | Minolta Camera Co Ltd | Variable power finder optical system |
| JPH04211214A (en) * | 1989-12-28 | 1992-08-03 | Asahi Optical Co Ltd | Image pickup lens |
| JPH0467113A (en) * | 1990-07-06 | 1992-03-03 | Minolta Camera Co Ltd | Compact zoom lens |
| JPH0478814A (en) * | 1990-07-20 | 1992-03-12 | Minolta Camera Co Ltd | Zoom lens |
| JPH0478813A (en) * | 1990-07-20 | 1992-03-12 | Minolta Camera Co Ltd | Zoom lens |
| JPH04141615A (en) * | 1990-10-02 | 1992-05-15 | Minolta Camera Co Ltd | Compact zoom lens |
| JPH04264413A (en) * | 1991-02-19 | 1992-09-21 | Minolta Camera Co Ltd | Compact zoom lens |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5956178A (en) * | 1996-09-02 | 1999-09-21 | Nikon Corporation | Keplerian variable magnification viewfinder |
| WO2011112119A1 (en) * | 2010-03-11 | 2011-09-15 | Закрытое Акционерное Общество "Импульс" | Projection high-speed objective |
| US10895718B2 (en) | 2019-02-01 | 2021-01-19 | Largan Precision Co., Ltd. | Optical photographing lens assembly, image capturing unit and electronic device |
| US11977274B2 (en) | 2019-02-01 | 2024-05-07 | Largan Precision Co., Ltd. | Optical photographing lens assembly, image capturing unit and electronic device |
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